Author: "Vardan, Baghmanyan" - Searchworks@Jio Institute Digital Library Search Results

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44 results on '"Vardan, Baghmanyan"'

1. Hadronic Processes at Work in 5BZB J0630−2406

Author: Gaëtan Fichet de Clairfontaine, Sara Buson, Leonard Pfeiffer, Stefano Marchesi, Alessandra Azzollini, Vardan Baghmanyan, Andrea Tramacere, Eleonora Barbano, and Lenz Oswald
Subjects: BL Lacertae objects, Gamma-rays, Neutrino astronomy, Non-thermal radiation sources, Astrophysics, QB460-466
Abstract: Recent observations are shedding light on the important role that active galactic nuclei play in the production of high-energy neutrinos. In this study, we focus on one object, 5BZB J0630−2406, which is among the blazars recently proposed as associated with neutrino emission during the first 7 yr of IceCube observations. Modeling the quasi-simultaneous, broadband spectral energy distribution, we explore various scenarios from purely leptonic to leptohadronic models, testing the inclusion of external photon fields. This theoretical study provides a complementary testing ground for the proposed neutrino–blazar association. Despite being historically classified as a BL Lac, our study shows that 5BZB J0630−2406 belongs to the relatively rare subclass of high-power flat-spectrum radio quasars. Our results indicate that interactions between protons and external radiation fields can produce a neutrino flux that is within the reach of the IceCube detector. Furthermore, the spectral shape of the X-ray emission suggests the imprint of hadronic processes related to very energetic protons.
Published: 2023
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2. Detailed study of extended γ-ray morphology in the vicinity of the Coma cluster with Fermi Large Area Telescope

Author: Vardan Baghmanyan, Davit Zargaryan, Felix Aharonian, Ruizhi Yang, Sabrina Casanova, and Jonathan Mackey
Subjects: Space and Planetary Science, Astronomy and Astrophysics
Abstract: Galaxy clusters can be sources of high-energy (HE) γ-ray radiation due to the efficient acceleration of particles exceeding EeV energies. At present, though, the only candidate for emitting HE γ-rays is the Coma cluster, towards which an excess of γ-ray emission has been detected by the Fermi Large Area Telescope (Fermi-LAT). Using ∼12.3 yr of Fermi-LAT data, we explored the region of the Coma cluster between energies 100 MeV and 1 TeV by detailed spectral and morphological analysis. In the region of the Coma cluster, we detected diffuse γ-ray emission of energies between 100 MeV and 1 TeV with a 5.4σ extension significance and a 68 per cent containment radius of $0.82^{+0.10}_{-0.05}$ degrees derived with a two-dimensional homogeneous disc model. The corresponding γ-ray spectrum extends up to ∼50 GeV, with a power-law index of Γ = 2.23 ± 0.11 and flux of $\mathrm{(3.84\pm 0.67)\times 10^{-12}\, erg\, cm^{-2}\, s^{-1}}$. Using energy arguments we show that point-like sources such as radiogalaxies and star-forming galaxies are unlikely to explain the emission, and more likely, the emission is produced in the Coma cluster. Besides, we also identified three point-like sources in the region. However, because of limited statistics, we could neither exclude nor confirm the contribution of three point-like sources to the total emissions.
Published: 2022
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3. Winds of star clusters significantly contribute to the Galactic cosmic-ray population

Author: Giada Peron, Sabrina Casanova, Stefano Gabici, Vardan Baghmanyan, and Felix Aharonian
Abstract: Cosmic rays are energetic nuclei that permeate the entire Galactic disk. Their existence requires the presence of powerful particle accelerators. While Galactic supernova explosions may supply the required energy, there is growing evidence that they cannot explain all of the observed properties of cosmic rays, such as their maximum particle energy and isotopic composition. Among Galactic objects, winds from stellar clusters meet the energetic requirement and provide a suitable environment for particle acceleration. The recent detection of some of these objects in γ-rays confirms that they indeed harbor high-energy particles. However, as most supernovae explode inside stellar clusters, it is difficult to distinguish the contribution of winds to particle acceleration. Here we report the detection of young star clusters in the nearby Vela molecular ridge star forming region. The young age of the systems guarantees an unbiased estimate of the stellar CR luminosity free from any supernova or pulsar contamination and allows us to draw conclusions on the acceleration efficiency and the total power supplied by these objects. We demonstrate that much more than 1\% of the wind mechanical power is converted into CRs and conclude that a non-negligible fraction of the CR population is contributed by stellar clusters.
Published: 2023
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4. Detection of extended TeV emission around the Geminga pulsar with H.E.S.S

Author: Michael Punch, Christo Venter, Christian Stegmann, Stefan Wagner, Andreas Zech, Yasunobu Uchiyama, M. Hörbe, L. Mohrmann, Hassan Abdalla, Albert Seyffert, Michael Backes, Laenita Lorraine Oberholzer, Dieter Horns, K. Nakashima, Tim Holch, K. Bernloehr, Naomi Tsuji, Heinrich J. Völk, Regis Terrier, Carlo Romoli, Gerard Fontaine, Tadayuki Takahashi, M. Fuessling, Hester Schutte, S. Steinmassl, Samuel Timothy Spencer, Sami Caroff, Victor Doroshenko, Frank M. Rieger, Clemens Hoischen, A. A. Zdziarski, P. T. O'Brien, Markus Holler, Q. Remy, Felix Jankowsky, Hannah Dalgleish, German Hermann, Paul Morris, Anne Lemiere, E. Kasai, Louis Du Plessis, Johann van der Walt, Martin Tluczykont, Dan Parsons, Anna Barnacka, D. Malyshev, Nukri Komin, Tom Armstrong, Felix Aharonian, Gilles Maurin, J. F. Glicenstein, David Sanchez, Krzysztof Katarzynski, Victor Barbosa Martins, Ira Jung, C. Arcaro, Sebastian Panny, Gianluca Giavitto, Angel Noel, Bruno Khelifi, Alison Mitchell, Santiago Pita, Werner Hofmann, Gašper Kukec Mezek, Atreyee Sinha, Emma Ona-Wilhelmi, Jonathan Mackey, Carlo van Rensburg, Gerd Puehlhofer, Lei Sun, Laura Olivera-Nieto, Hambeleleni Ndiyavala, Floriane Cangemi, A. Yusafzai, C. Levy, Alexandre Marcowith, Felix Werner, Thomas Lohse, Hend Yassin, Anton Dmytriiev, Manuel Meyer, Arnaud Mares, Manami Sasaki, Mathieu Naurois, Catherine Boisson, Jhilik Majumdar, N. Zywucka, Sumari Hattingh, Takaaki Tanaka, Gavin Rowell, Hector Rueda Ricarte, Mathieu Bony, Oguzhan Anguener, C. Moore, Riaan Steenkamp, Richard White, Kirsty Feijen, Heike Prokoph, Thomas Bylund, Rowan Batzofin, Andreas Zmija, Dorit Glawion, Samuel Zouari, Tomasz Bulik, Robert Brose, Andrea Santangelo, Jacco Vink, Michal Ostrowski, Anna Luashvili, Jacques Muller, Malgorzata Curlo, Marion Spir-Jacob, M. Lemoine-Goumard, Lente Dreyer, David Huber, J.-P. Lenain, Matthieu Renaud, Amid Nayerhoda, Hugh Spackman, Michael Kreter, Justine Devin, Sabrina Casanova, Anu Kundu, Stefan Klepser, V. Sahakian, G. Peron, Alessandro Montanari, Garret Cotter, Vikas Joshi, Zhiqiu Huang, T. Chand, Lott Frans, D. A. Prokhorov, K. Kosack, Sylvia Zhu, P. J. Meintjes, David Berge, Yves Gallant, Lukasz Stawarz, Stefan Ohm, Halim Ashkar, Fabian Leuschner, Jason John Watson, Davit Zargaryan, Arache Djannati-Ataï, Johannes Schaefer, S. J. Fegan, Andreas Quirrenbach, Gaëtan Fichet de Clairfontaine, Axel Donath, A. W. Chen, Stefan Funk, Alicja Wierzcholska, Guillem Marti'i-Devesa, P. Reichherzer, V. Poireau, Jimmy N.S. Shapopi, Jaqueline Catalano, Stefano Gabici, Ramin Marx, M. Panter, Michael Zacharias, Jim Hinton, Jean-Pierre Ernenwein, U. Katz, G. Lamanna, R. Konno, Isak Delberth Davids, Fabian Schüssler, A. Fiasson, Sabrina Einecke, Iryna Lypova, S. Sailer, Dmitry Khangulyan, Charles Thorpe-Morgan, Roberta Zanin, Emmanuel Moulin, Andrew Taylor, B. Rudak, Kathrin Egberts, Johannes Veh, J. Bolmont, Faical Ait-Benkhali, Kleopas Shiningayamwe, Jacek Niemiec, G. Vasileiadis, Monica Barnard, Yvonne Becherini, Denys Malyshev, Maria Haupt, Olaf Reimer, Edna Ruiz Velasco, Lenka Tomankova, Sébastien Le Stum, Thomas Murach, Christopher van Eldik, Rafal Moderski, Mohanraj Senniappan, Francois Brun, P. Vincent, Heiko Salzmann, Andreas Specovius, Yu Wun Wong, Vincent Marandon, Hannes Thiersen, Vardan Baghmanyan, Celine Armand, Dmitriy Kostunin, L. Giunti, Brian van Soelen, Thomas Tavernier, Markus Boettcher, Michelle Tsirou, M.-H. Grondin, Rachel Simoni, Anita Reimer, Constantin Steppa, Ullrich Schwanke, Jean Damascene Mbarubucyeye, Wlodek Kluzniak, Brian Reville, Connor Duffy, James Davies, R. J. Tuffs, B. Bi, Mischa Breuhaus, Pauline Chambery, Marek Jamrozy, Helene Sol, Paolo Marchegiani, Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), and H.E.S.S.
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Astrophysics::High Energy Astrophysical Phenomena, Gamma rays, Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, imaging, Astronomy, IACT, Cosmology, Tellurium compounds, Cherenkov counter, gamma ray: emission, Pulsar, HESS, Milagro, TeV, HESS - Abteilung Hinton, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Astrophysics - High Energy Astrophysical Phenomena, HAWC, Cosmic rays, Cherenkov radiation, pulsar
Abstract: Highly extended gamma-ray emission around the Geminga pulsar was discovered by Milagro and verified by HAWC. Despite many observations with Imaging Atmospheric Cherenkov Telescopes (IACTs), detection of gamma-ray emission on angular scales exceeding the IACT field-of-view has proven challenging. Recent developments in analysis techniques have enabled the detection of significant emission around Geminga in archival data with H.E.S.S.. In 2019, further data on the Geminga region were obtained with an adapted observation strategy. Following the announcement of the detection of significant TeV emission around Geminga in archival data, in this contribution we present the detection in an independent dataset. New analysis results will be presented, and emphasis given to the technical challenges involved in observations of highly extended gamma-ray emission with IACTs., PoS: Proceedings of Science, 395, ISSN:1824-8039, Proceedings of 37th International Cosmic Ray Conference
Published: 2022

5. Horizontal muon track identification with neural networks in HAWC

Author: Ian Herzog, Lukas Nellen, Hao Zhou, Ramiro Torres Escobedo, Segev BenZvi, Nicola Omodei, Samridha Kunwar, Arturo Iriarte, Israel Martinez Castellanos, David Kieda, Ke Fang, Hannah Jhee, Josefa Becerra Gonzalez, Harm Schoorlemmer, Jesús Martínez-Castro, Michael Newbold, Francisco Salesa Greus, Fernando Garfias, J. A. Goodman, Joshua Wood, David Berley, Nissim Illich Fraija, Alison Peisker, Thomas Weisgarber, Andrew James Smith, Xiaojie Wang, Henrike Fleischhack, Rishi Babu, Kelly Malone, Jason Fan, Humberto Ibarguen Salazar, Rhiannon Turner, Chad Brisbois, Vikas Joshi, Kristi Engel, Dezhi Huang, Diego Garcia Aguilar, Vincent Marandon, Alberto Carramiñana, Brenda Dingus, Mehr Nisa, Raquel Diaz Hernandez, Ian James Watson, Vardan Baghmanyan, José Roberto Angeles Camacho, Daniel Omar Avila Rojas, Hawc, Miguel Mostafa, Dirk Lennarz, Jorge Luis Flores, Cederik León de León, Ibrahim Torres, Joe Lundeen, Gilgamesh Luis-Raya, Maria Magdalena González, Pedro Miranda-Romagnoli, Kirsten Tollefson, Eucario Gonzalo Pérez Pérez, Andrea Albert, Hugo Alberto Ayala Solares, Eduardo Moreno Barbosa, Roberto Noriega-Papaqui, Eduardo de la Fuente, Gwenael Giacinti, Filiberto Hueyotl-Zahuantitla, Juan Carlos Arteaga Velazquez, Guillermo García-Torales, Arun Babu Kollamparambil, Robert Ellsworth, Meghan Tanner, Gerd J. Kunde, Colas Rivière, Hermes Leon Vargas, Oscar Chaparro-Amaro, Umberto Cotti, Arnulfo Zepeda, Sabrina Casanova, Ruben Lopez-Coto, Brian Fick, Pooja Surajbali, Andrés Sandoval, Lorenzo Diaz, Laura Olivera-Nieto, Yunior Pérez Araujo, Anna Lia Longinotti, Gus Sinnis, Fernando Ureña-Mena, Ernesto Belmont-Moreno, Jim Hinton, María Catalina Espinoza Hernández, Jorge Antonio Morales Soto, Tomás Capistrán, Hazal Goksu, Gaurang Yodh, Sergio Hernández Cadena, Brian Humensky, Jorge Cotzomi, Anushka Udara Abeysekara, Michelle Hui, Elijah Willox, César Alvarez, Jose Luis García-Luna, Ignacio Taboada, José Serna-Franco, Ruben Alfaro, Karen S. Caballero Mora, Jason Lee, J. T. Linnemann, Daniel Rosa-Gonzalez, Michael Schneider, Luis Villaseñor, Felix Werner, Ahron S. Barber, Jose Andres Garcia-Gonzalez, John Matthews, Mora Durocher, Petra Hüntemeyer, Mateo Fernandez Alonso, Oscar Martinez, Wayne Robert Springer, Amid Nayerhoda, James Ryan, Binita Hona, Sara Coutiño de Leon, Alejandro Lara, Michael DuVernois, Juan de Dios Álvarez Romero, William H. Lee, Julie McEnery, Juan Carlos Díaz Vélez, Chang Dong Rho, Armelle Jardin-Blicq, J. Patrick Harding, Humberto Martínez Huerta, Edna Ruiz-Velasco, and HAWC Collaboration
Subjects: HAWC - Abteilung Hinton, Physics - Instrumentation and Detectors, Muon, Artificial neural network, Computer science, business.industry, Track (disk drive), Computer Science::Neural and Evolutionary Computation, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Identification (information), Computer vision, Artificial intelligence, Astrophysics - Instrumentation and Methods for Astrophysics, business, Instrumentation and Methods for Astrophysics (astro-ph.IM)
Abstract: Nowadays the implementation of artificial neural networks in high-energy physics has obtained excellent results on improving signal detection. In this work we propose to use neural networks (NNs) for event discrimination in HAWC. This observatory is a water Cherenkov gamma-ray detector that in recent years has implemented algorithms to identify horizontal muon tracks. However, these algorithms are not very efficient. In this work we describe the implementation of three NNs: two based on image classification and one based on object detection. Using these algorithms we obtain an increase in the number of identified tracks. The results of this study could be used in the future to improve the performance of the Earth-skimming technique for the indirect measurement of neutrinos with HAWC., Comment: 8 pages, 6 figures, Proceedings of the 37th International Cosmic Ray Conference (ICRC 2021)
Published: 2022

6. Searching for VHE gamma-ray emission associated with IceCube neutrino alerts using FACT, H.E.S.S., MAGIC, and VERITAS

Author: Konstancja, Satalecka, Acciari, Victor A., Stefano, Ansoldi, Lucio Angelo Antonelli, Axel Arbet Engels, Manuel, Artero, Katsuaki, Asano, Dominik, Baack, Ana, Babic, Andr('(e))s, Baquero, Ulisses Barres de Almeida, Juan Abel Barrio, Ivana, Batkovi('(c)), Josefa Becerra Gonzalez, Wlodek, Bednarek, Lorenzo, Bellizzi, Elisa, Bernardini, Maria-Isabel, Bernardos, Alessio, Berti, Jürgen, Besenrieder, Wrijupan, Bhattacharyya, Ciro, Bigongiari, Adrian, Biland, Oscar, Blanch, Hendrik, Bökenkamp, Giacomo, Bonnoli, Zeljka, Bosnjak, Giovanni, Busetto, Roberto, Carosi, Giovanni, Ceribella, Matteo, Cerruti, Yating, Chai, Ashot, Chilingarian, Stefan, Cikota, Sidika Merve Colak, Eduardo, Colombo, Jose Luis Contreras, Juan, Cortina, Stefano, Covino, Giacomo D( extquotesingle)Amico, Valerio D( extquotesingle)Elia, Paolo Da Vela, Francesco, Dazzi, Alessandro De Angelis, Barbara De Lotto, Manuel, Delfino, Jordi, Delgado, Carlos Delgado Mendez, Davide, Depaoli, Federico Di Pierro, Leonardo Di Venere, Elia Do Souto Espi(~(n))eira, Dijana Dominis Prester, Alice, Donini, Daniela, Dorner, Michele, Doro, Dominik, Elsaesser, Vandad Fallah Ramazani, Alicia, Fattorini, Maria Victoria Fonseca, Lluis, Font, Christian, Fruck, Satoshi, Fukami, Yasushi, Fukazawa, Garc('(i))a L('(o))pez, Ramon J., Markus, Garczarczyk, Sargis, Gasparyan, Markus, Gaug, Giglietto, Nicola, Francesco, Giordano, Pawel, Gliwny, Nikola, Godinovic, David, Green, Jarred Gershon Green, Daniela, Hadasch, Alexander, Hahn, Lea, Heckmann, Javier, Herrera, John, Hoang, Dario, Hrupec, Moritz, Hütten, Tomohiro, Inada, Kazuma, Ishio, Yuki, Iwamura, Irene Jim('(e))nez Mart('(i))nez, Jenni, Jormanainen, L('(e))a, Jouvin, Marie, Karjalainen, Daniel, Kerszberg, Yukiho, Kobayashi, Hidetoshi, Kubo, Junko, Kushida, Alessandra, Lamastra, Damir, Lelas, Francesco, Leone, Elina, Lindfors, Lena, Linhoff, Saverio, Lombardi, Francesco, Longo, Ruben, Lopez-Coto, Marcos, L('(o))pez-Moya, Alicia, L('(o))pez-Oramas, Loporchio, Serena, Bernardo Machado de Oliveira Fraga, Camilla, Maggio, Pratik, Majumdar, Martin, Makariev, Manuela, Mallamaci, Galina, Maneva, Marina, Manganaro, Karl, Mannheim, Laura, Maraschi, Mos(`(e)), Mariotti, Manel, Martinez, Daniel, Mazin, Stefano, Menchiari, Simone, Mender, Sa( (s))a Mi('(c))anovi('(c)), Davide, Miceli, Tjark, Miener, Jose Miguel Miranda, Razmik, Mirzoyan, Edgar, Molina, Abelardo, Moralejo, Daniel, Morcuende, Victoria, Moreno, Elena, Moretti, Takeshi, Nakamori, Lara, Nava, Vitaly, Neustroev, Cosimo, Nigro, Kari, Nilsson, Kyoshi, Nishijima, Koji, Noda, Seiya, Nozaki, Yoshiki, Ohtani, Tomohiko, Oka, Jorge, Otero-Santos, Simona, Paiano, Michele, Palatiello, David, Paneque, Riccardo, Paoletti, Paredes, Josep M., Lovro, Pavleti('(c)), Pablo, Pe(~(n))il, Massimo, Persic, Marine, Pihet, Pier Giorgio Prada Moroni, Elisa, Prandini, Chaitanya, Priyadarshi, Ivica, Puljak, Wolfgang, Rhode, Marc, Rib('(o)), Javier, Rico, Chiara, Righi, Andrea, Rugliancich, Narek, Sahakyan, Takayuki, Saito, Shunsuke, Sakurai, Francesco Gabriele Saturni, Bernd, Schleicher, Kevin, Schmidt, Thomas, Schweizer, Julian, Sitarek, Iva, ( (S))nidari('(c)), Dorota, Sobczy('(n))ska, Alessia, Spolon, Antonio, Stamerra, Jelena Stri( (s))kovi('(c)), Derek, Strom, Marcel, Strzys, Yusuke, Suda, Tihomir, Suri('(c)), Mitsunari, Takahashi, Ryuji, Takeishi, Fabrizio, Tavecchio, Petar, Temnikov, Tomislav, Terzic, Masahiro, Teshima, Luca, Tosti, Stefano, Truzzi, Antonio, Tutone, Santiago, Ubach, Juliane van Scherpenberg, Gaia, Vanzo, Monica VAZQUEZ ACOSTA, Sofia, Ventura, Vassil, Verguilov, Carlo Francesco Vigorito, Vincenzo, Vitale, Ievgen, Vovk, Martin, Will, Carolin, Wunderlich, Tokonatsu, Yamamoto, Darko, Zari('(c)), Matteo, Balbo, Thomas, Bretz, Jens, Buss, Laura, Eisenberger, Dorothee, Hildebrand, Roman, Iotov, Adelina, Kalenski, Dominik, Neise, Maximilian, Noethe, Aleksander, Paravac, Vitalii, Sliusar, Roland, Walter, Rasha, Abbasi, Markus, Ackermann, Jenni, Adams, Juanan, Aguilar, Ahlers, M., Maryon, Ahrens, Cyril Martin Alispach, Antonio Augusto Alves Junior, Najia Moureen Binte Amin, Rui, An, Karen, Andeen, Tyler, Anderson, Gisela, Anton, Carlos, Arguelles, Yosuke, Ashida, Spencer, Axani, Xinhua, Bai, Aswathi Balagopal, V., Anastasia Maria Barbano, Barwick, S. W., Benjamin, Bastian, Vedant, Basu, Sebastian, Baur, Bay, R. C., Beatty, J. J., Becker, K. -H., Julia Becker Tjus, Chiara, Bellenghi, Segev, Benzvi, Berley, D., Besson, D. Z., Gary, Binder, Daniel, Bindig, Blaufuss, E., Summer, Blot, Matthias, Boddenberg, Federico, Bontempo, Jurgen, Borowka, Boser, S., Olga, Botner, Jakob, Bottcher, Etienne, Bourbeau, Federica, Bradascio, Braun, J., Stephanie, Bron, Jannes, Brostean-Kaiser, Sally-Ann, Browne, Alexander, Burgman, Ryan, Burley, Raffaela, Busse, Michael, Campana, Erin, Carnie-Bronca, Chujie, Chen, Dmitry, Chirkin, Koun, Choi, Bryanlee, Clark, Kenneth, Clark, Lew, Classen, Alan, Coleman, Gabriel, Collin, Conrad, J. M., Paul, Coppin, Pablo, Correa, Cowen, D. F., Cross, R., Christian, Dappen, Pranav, Dave, Catherine DE CLERCQ, James, Delaunay, Hans, Dembinski, Kunal, Deoskar, Sam De Ridder, Abhishek, Desai, Paolo, Desiati, Krijn de Vries, Gwenhaël de Wasseige, Meike De With, Tyce, Deyoung, Sukeerthi, Dharani, Alejandro, Diaz, Juan Carlos Diaz-Velez, Markus, Dittmer, Hrvoje, Dujmovic, Matt, Dunkman, Michael, Duvernois, Emily, Dvorak, Thomas, Ehrhardt, Philipp, Eller, Ralph, Engel, Hannah, Erpenbeck, John, Evans, Evenson, P. A., Kwok Lung Fan, Fazely, A. R., Sebastian, Fiedlschuster, Aaron, Fienberg, Kirill, Filimonov, Chad, Finley, Leander, Fischer, Derek, B Fox, Anna, Franckowiak, Elizabeth, Friedman, Alexander, Fritz, Philipp, Furst, Gaisser, T. K., Jay, Gallagher, Erik, Ganster, Alfonso, Garcia, Simone, Garrappa, Gerhardt, L., Ava, Ghadimi, Christian, Glaser, Theo, Glauch, Thorsten, Glusenkamp, Goldschmidt, A., Javier, Gonzalez, Sreetama, Goswami, Darren, Grant, Timoth('(e))e, Gr('(e))goire, Spencer, Griswold, Mehmet, Gunduz, Christoph, Günther, Christian, Haack, Allan, Hallgren, Halliday, R., Halve, L., Halzen, F., Martin Ha Minh, Kael, Hanson, John, Hardin, Harnisch, Alexander A., Andreas, Haungs, Simon, Hauser, Dustin, Hebecker, Helbing, K., Felix, Henningsen, Hettinger, Emma C., Stephanie, Hickford, Joshua, Hignight, Colton, Hill, Hill, G. C., Kara, Hoffman, Ruth, Hoffmann, Tobias, Hoinka, Benjamin, Hokanson-Fasig, Hoshina, K., Feifei, Huang, Matthias, Huber, Thomas, Huber, Klas, Hultqvist, Mirco, Hunnefeld, Raamis, Hussain, Seongjin, In, Nad(`(e))ge, Iovine, Aya, Ishihara, Matti, Jansson, George, Japaridze, Minjin, Jeong, Ben, Jones, Donghwa, Kang, Woosik, Kang, Xinyue, Kang, Alexander, Kappes, David, Kappesser, Timo, Karg, Martina, Karl, Karle, A., Katz, U., Kauer, M., Moritz, Kellermann, Kelley, J. L., Ali, Kheirandish, Ken( extquotesingle)ichi Kin, Thomas, Kintscher, Joanna, Kiryluk, Spencer, Klein, Ramesh, Koirala, Hermann, Kolanoski, Tomas, Kontrimas, Lutz, Kopke, Claudio, Kopper, Sandro, Kopper, Koskinen, D. J., Paras, Koundal, Michael, Kovacevich, Marek, Kowalski, Tetiana, Kozynets, Emma, Kun, Naoko, Kurahashi, Neha, Lad, Cristina Lagunas Gualda, Justin, Lanfranchi, Michael, J Larson, Frederik Hermann Lauber, Jeffrey, Lazar, Jiwoong, Lee, Kayla, Leonard, Agnieszka, Leszczy('(n))ska, Yijia, Li, Massimiliano, Lincetto, Qinrui, Liu, Maria, Liubarska, Elisa, Lohfink, Cristian Jesus Lozano Mariscal, Lu, Lu, Francesco, Lucarelli, Andrew, Ludwig, William, Luszczak, Yang, Lyu, Wing Yan Ma, James, Madsen, Kendall, Mahn, Yuya, Makino, Sarah, Mancina, Ioana Codrina Maris, Maruyama, Reina H., Mase, K., Thomas, Mcelroy, Frank, Mcnally, James Vincent Mead, Meagher, K., Andres, Medina, Maximilian, Meier, Stephan, Meighen-Berger, Jessie, Micallef, Daniela, Mockler, Teresa, Montaruli, Roger, Moore, Morse, R., Marjon, Moulai, Richard, Naab, Ryo, Nagai, Uwe, Naumann, Jannis, Necker, Le Viet Nguyen, Hans, Niederhausen, Mehr, Nisa, Sarah, Nowicki, Dave, Nygren, Anna Obertacke Pollmann, Marie, Oehler, Olivas, A., Erin O( extquotesingle)Sullivan, Hershal, Pandya, Daria, Pankova, Nahee, Park, Grant, Parker, Ek Narayan Paudel, Larissa, Paul, Carlos Perez de los Heros, Lilly, Peters, Saskia, Philippen, Damian, Pieloth, Sarah, Pieper, Martin, Pittermann, Pizzuto, A., Plum, M., Yuiry, Popovych, Alessio, Porcelli, Maria Prado Rodriguez, Buford Price, P., Brandom, Pries, Gerald, Przybylski, Christoph, Raab, Amirreza, Raissi, Mohamed, Rameez, Rawlins, K., Immacolata Carmen Rea, Abdul, Rehman, Ren('(e)), Reimann, Giovanni, Renzi, Elisa, Resconi, Simeon, Reusch, Mike, Richman, Benedikt, Riedel, Ella, Roberts, Sally, Robertson, Gerrit, Roellinghoff, Martin, Rongen, Carsten, Rott, Tim, Ruhe, Dirk, Ryckbosch, Devyn Rysewyk Cantu, Ibrahim, Safa, Julian, Saffer, Sebastian Sanchez Herrera, Alexander, Sandrock, Joakim, Sandroos, Marcos, Santander, Subir, Sarkar, Sourav, Sarkar, Maximilian Karl Scharf, Merlin, Schaufel, Harald, Schieler, Sebastian, Schindler, Schlunder, P., Torsten, Schmidt, Austin, Schneider, Judith, Schneider, Schröder, Frank G., Lisa Johanna Schumacher, Georg, Schwefer, Steve, Sclafani, Seckel, D., Surujhdeo, Seunarine, Ankur, Sharma, Shefali, Shefali, Manuel, Silva, Barbara, Skrzypek, Ben, Smithers, Robert, Snihur, Jan, Soedingrekso, Dennis, Soldin, Christian, Spannfellner, Glenn, Spiczak, Christian, Spiering, Juliana, Stachurska, Michael, Stamatikos, Stanev, T., Robert, Stein, Joeran, Stettner, Steuer, A., Stezelberger, T., Timo, Sturwald, Thomas, Stuttard, Sullivan, G. W., Taboada, I., Frederik, Tenholt, Samvel, Ter-Antonyan, Tilav, S., Franziska, Tischbein, Kirsten, Tollefson, Christoph, Tönnis, Simona, Toscano, Delia, Tosi, Alexander, Trettin, Maria, Tselengidou, Chunfai, Tung, Andrea, Turcati, Roxanne, Turcotte, Colin, Turley, Jean Pierre Twagirayezu, Bunheng, Ty, Martin Unland Elorrieta, Nora, Valtonen-Mattila, Justin, Vandenbroucke, Nick van Eijndhoven, David, Vannerom, Jakob van Santen, Stef, Verpoest, Matthias, Vraeghe, Walck, C., Timothyblake, Watson, Chris, Weaver, Philip, Weigel, Andreas, Weindl, Matthew, Weiss, Jan, Weldert, Chris, Wendt, Johannes, Werthebach, Mark, Weyrauch, Nathan, Whitehorn, Wiebusch, C. H., Dawn, Williams, Martin, Wolf, Kurt, Woschnagg, Gerrit, Wrede, Johan, Wulff, Xianwu, Xu, Yiqian, Xu, Juan Pablo Yanez, Yoshida, S., Shiqi, Yu, Tianlu, Yuan, Zelong, Zhang, Weidong, Jin, Hassan, Abdalla, Felix, Aharonian, Faical, Ait-Benkhali, Oguzhan, Anguener, Cornelia, Arcaro, Celine, Armand, Tom, Armstrong, Halim, Ashkar, Michael, Backes, Vardan, Baghmanyan, Victor Barbosa Martins, Anna, Barnacka, Monica, Barnard, Rowan, Batzofin, Yvonne, Becherini, David, Berge, Konrad, Bernlöhr, Baiyang, Bi, Markus, Boettcher, Catherine, Boisson, Julien, Bolmont, Mathieu de Bony, Mischa, Breuhaus, Robert, Brose, Francois, Brun, Tomasz, Bulik, Thomas, Bylund, Floriane, Cangemi, Sami, Caroff, Sabrina, Casanova, Jaqueline, Catalano, Pauline, Chambery, Tej Bahadur Chand, Andrew, Chen, Garret, Cotter, Malgorzata, Curlo, Jean Damascene Mbarubucyeye, Isak Delberth Davids, James, Davies, Justine, Devin, Arache, Djannati-Ataï, Anton, Dmytriiev, Axel, Donath, Victor, Doroshenko, Lente, Dreyer, Louis Du Plessis, Connor, Duffy, Kathrin, Egberts, Sabrina, Einecke, Gabriel, Emery, Jean-Pierre, Ernenwein, Steven, Fegan, Kirsty, Feijen, Armand, Fiasson, Gaëtan Fichet de Clairfontaine, Gerard, Fontaine, Lott, Frans, Matthias, Fuessling, Stefan, Funk, Stefano, Gabici, Yves, Gallant, Shahede, Ghafourizade, Gianluca, Giavitto, Luca, Giunti, Dorit, Glawion, Jean-Francois, Glicenstein, Marie-H('(e))l(`(e))ne, Grondin, Sumari, Hattingh, Maria, Haupt, German, Hermann, Jim, Hinton, Werner, Hofmann, Clemens, Hoischen, Tim, Holch, Markus, Holler, Dieter, Horns, Zhiqiu, Huang, David, Huber, Mario, Hörbe, Marek, Jamrozy, Felix, Jankowsky, Vikas, Joshi, Ira, Jung, Eli, Kasai, Krzysztof, Katarzynski, Ul(`(i)), Katz, Dmitry, Khangulyan, Bruno, Khelifi, Stefan, Klepser, Wlodek, Kluzniak, Nukri, Komin, Ruslan, Konno, Karl, Kosack, Dmitriy, Kostunin, Michael, Kreter, Ga( (s))per Kukec Mezek, Anu, Kundu, Giovanni, Lamanna, S('(e))bastien Le Stum, Anne, Lemiere, Marianne, Lemoine-Goumard, Jean-Philippe, Lenain, Fabian, Leuschner, Christelle, Levy, Thomas, Lohse, Anna, Luashvili, Iryna, Lypova, Jonathan, Mackey, Jhilik, Majumdar, Denys, Malyshev, Dmitry, Malyshev, Vincent, Marandon, Paolo, Marchegiani, Alexandre, Marcowith, Arnaud, Mares, Guillem Marti( extquotesingle)i-Devesa, Ramin, Marx, Gilles, Maurin, Pieter, Meintjes, Manuel, Meyer, Alison, Mitchell, Rafal, Moderski, Lars, Mohrmann, Alessandro, Montanari, Chris, Moore, Paul, Morris, Emmanuel, Moulin, Jacques, Muller, Thomas, Murach, Kaori, Nakashima, Mathieu Naurois (de), Amid, Nayerhoda, Hambeleleni, Ndiyavala, Jacek, Niemiec, Angel, Noel, Paul O( extquotesingle)Brien, Laenita Lorraine Oberholzer, Stefan, Ohm, Laura, Olivera-Nieto, Emma Ona-Wilhelmi (de), Michal, Ostrowski, Sebastian, Panny, Michael, Panter, Dan, Parsons, Giada, Peron, Santiago, Pita, Vincent, Poireau, Dmitry, Prokhorov, Heike, Prokoph, Gerd, Puehlhofer, Michael, Punch, Andreas, Quirrenbach, Patrick, Reichherzer, Anita, Reimer, Olaf, Reimer, Quentin, Remy, Matthieu, Renaud, Brian, Reville, Frank, Rieger, Carlo, Romoli, Gavin, Rowell, Bronislaw, Rudak, Hector Rueda Ricarte, Edna Ruiz Velasco, Vardan, Sahakian, Simon, Sailer, Heiko, Salzmann, David, Sanchez, Andrea, Santangelo, Manami, Sasaki, Johannes, Schaefer, Hester, Schutte, Ullrich, Schwanke, Fabian, Schüssler, Mohanraj, Senniappan, Albert, Seyffert, Shapopi, Jimmy N. S., Kleopas, Shiningayamwe, Rachel, Simoni, Atreyee, Sinha, Helene, Sol, Hugh, Spackman, Andreas, Specovius, Samuel Timothy Spencer, Marion, Spir-Jacob, Lukasz, Stawarz, Riaan, Steenkamp, Christian, Stegmann, Simon, Steinmassl, Constantin, Steppa, Lei, Sun, Tadayuki, Takahashi, Takaaki, Tanaka, Thomas, Tavernier, Andrew, Taylor, Regis, Terrier, Hannes, Thiersen, Charles, Thorpe-Morgan, Martin, Tluczykont, Lenka, Tomankova, Michelle, Tsirou, Naomi, Tsuji, Richard, Tuffs, Yasunobu, Uchiyama, Johann van der Walt, Christopher van Eldik, Carlo van Rensburg, Brian van Soelen, George, Vasileiadis, Johannes, Veh, Christo, Venter, Pascal, Vincent, Jacco, Vink, Völk, Heinrich J., Stefan, Wagner, Jason John Watson, Felix, Werner, Richard, White, Alicja, Wierzcholska, Yu Wun Wong, Hend, Yassin, Anke, Yusafzai, Michael, Zacharias, Roberta, Zanin, Davit, Zargaryan, Andrzej, Zdziarski, Andreas, Zech, Sylvia, Zhu, Andreas, Zmija, Samuel, Zouari, Natalia, Zywucka, The FACT Collaboration, The H.E.S.S. Collaboration, The IceCube Collaboration, The MAGIC Collaboration, The VERITAS Collaboration, and Współautorami artykułu są członkowie Magic Collaboration, IceCube Collaboration, FACT Collaboration, H.E.S.S. Collaboration, VERITAS Collaboration w liczbie 808
Subjects: Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Point source, Astrophysics::High Energy Astrophysical Phenomena, Gamma ray, Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, IACT, Astrophysics, law.invention, High Energy Physics - Experiment, Telescope, High Energy Physics - Experiment (hep-ex), law, HESS - Abteilung Hinton, ddc:530, High Energy Physics::Experiment, MAGIC (telescope), Neutrino, Blazar, Astrophysics - High Energy Astrophysical Phenomena, Cherenkov radiation
Abstract: The realtime follow-up of neutrino events is a promising approach to search for astrophysical neutrino sources. It has so far provided compelling evidence for a neutrino point source: the flaring gamma-ray blazar TXS 0506+056 observed in coincidence with the high-energy neutrino IceCube-170922A detected by IceCube. The detection of very-high-energy gamma rays (VHE, $\mathrm{E} > 100\,\mathrm{GeV}$) from this source helped establish the coincidence and constrained the modeling of the blazar emission at the time of the IceCube event. The four major imaging atmospheric Cherenkov telescope arrays (IACTs) - FACT, H.E.S.S., MAGIC, and VERITAS - operate an active follow-up program of target-of-opportunity observations of neutrino alerts sent by IceCube. This program has two main components. One are the observations of known gamma-ray sources around which a cluster of candidate neutrino events has been identified by IceCube (Gamma-ray Follow-Up, GFU). Second one is the follow-up of single high-energy neutrino candidate events of potential astrophysical origin such as IceCube-170922A. GFU has been recently upgraded by IceCube in collaboration with the IACT groups. We present here recent results from the IACT follow-up programs of IceCube neutrino alerts and a description of the upgraded IceCube GFU system., Presented at the 37th International Cosmic Ray Conference (ICRC 2021). See arXiv:2107.06966 for all IceCube contributions. See arXiv:2108.05257 for all H.E.S.S. contributions
Published: 2022

7. Limits on primordial black hole evaporation from H.E.S.S. observations

Author: Hannah Dalgleish, Michael Punch, Samuel Timothy Spencer, Stefan Ohm, Stefan Klepser, M. Fuessling, Constantin Steppa, Markus Holler, Q. Remy, Felix Jankowsky, Alessandro Montanari, Stefano Gabici, Felix Aharonian, Dan Parsons, S. Steinmassl, Sami Caroff, Gianluca Giavitto, Sumari Hattingh, Takaaki Tanaka, Ramin Marx, M. Panter, Laura Olivera-Nieto, A. Yusafzai, M.-H. Grondin, U. Katz, N. Zywucka, Alison Mitchell, Krzysztof Katarzynski, Catherine Boisson, J. Bolmont, Victor Barbosa Martins, Ullrich Schwanke, P. T. O'Brien, Jhilik Majumdar, Markus Boettcher, Faical Ait-Benkhali, Dieter Horns, C. Arcaro, Floriane Cangemi, V. Poireau, Jimmy N.S. Shapopi, Jean Damascene Mbarubucyeye, Wlodek Kluzniak, Clemens Hoischen, A. A. Zdziarski, Carlo van Rensburg, Albert Seyffert, Justine Devin, Gavin Rowell, G. Vasileiadis, Johann van der Walt, V. Sahakian, K. Nakashima, Sébastien Le Stum, Denys Malyshev, Regis Terrier, Mathieu Bony, Oguzhan Anguener, Tadayuki Takahashi, Victor Doroshenko, L. Giunti, E. Kasai, Vikas Joshi, Carlo Romoli, Yves Gallant, Frank M. Rieger, Atreyee Sinha, Kirsty Feijen, K. Bernloehr, Samuel Zouari, Andreas Zmija, Christian Stegmann, Michal Ostrowski, Stefan Wagner, J.-P. Lenain, Christo Venter, Hugh Spackman, S. J. Fegan, Andreas Zech, Jason John Watson, Heinrich J. Völk, Jean-Pierre Ernenwein, M. Lemoine-Goumard, Yasunobu Uchiyama, Matthieu Renaud, Mohanraj Senniappan, L. Mohrmann, Lukasz Stawarz, Anton Dmytriiev, German Hermann, Paul Morris, Johannes Veh, Brian Reville, Connor Duffy, James Davies, Stefan Funk, Alicja Wierzcholska, Michelle Tsirou, Michael Kreter, Anne Lemiere, Rachel Simoni, Andreas Quirrenbach, Manami Sasaki, R. J. Tuffs, B. Bi, Guillem Marti'i-Devesa, Jacek Niemiec, M. Hörbe, Andreas Specovius, Andrea Santangelo, Mischa Breuhaus, Pauline Chambery, Olaf Reimer, Michael Zacharias, Emma Ona-Wilhelmi, Martin Tluczykont, Yu Wun Wong, Robert Brose, Michael Backes, Francois Brun, Thomas Lohse, Marek Jamrozy, Jaqueline Catalano, T. Chand, Thomas Murach, Arache Djannati-Ataï, P. Reichherzer, Gašper Kukec Mezek, P. Vincent, Anita Reimer, Laenita Lorraine Oberholzer, Nukri Komin, G. Lamanna, Helene Sol, R. Konno, Monica Barnard, Anna Barnacka, Heiko Salzmann, G. Peron, Vincent Marandon, Hannes Thiersen, Andrew Taylor, Garret Cotter, Tim Holch, Dmitriy Kostunin, Hend Yassin, Isak Delberth Davids, Manuel Meyer, A. Fiasson, Tom Armstrong, Celine Armand, Johannes Schaefer, Roberta Zanin, Zhiqiu Huang, Paolo Marchegiani, Vardan Baghmanyan, Naomi Tsuji, Mathieu Naurois, D. A. Prokhorov, K. Kosack, Gerard Fontaine, Brian van Soelen, David Sanchez, Santiago Pita, Werner Hofmann, Hester Schutte, Hambeleleni Ndiyavala, Gilles Maurin, J. F. Glicenstein, Thomas Tavernier, Kleopas Shiningayamwe, Bruno Khelifi, Edna Ruiz Velasco, Lenka Tomankova, Sabrina Einecke, Iryna Lypova, Yvonne Becherini, Hassan Abdalla, C. Levy, Sylvia Zhu, P. J. Meintjes, David Berge, Richard White, Jacco Vink, Heike Prokoph, Marion Spir-Jacob, David Huber, Amid Nayerhoda, Maria Haupt, Sabrina Casanova, Halim Ashkar, Fabian Leuschner, B. Rudak, Kathrin Egberts, Christopher van Eldik, Rafal Moderski, Anna Luashvili, Lott Frans, Jim Hinton, S. Sailer, Dmitry Khangulyan, Charles Thorpe-Morgan, Angel Noel, Jonathan Mackey, C. Moore, Dorit Glawion, Davit Zargaryan, Tomasz Bulik, Malgorzata Curlo, Lente Dreyer, Gaëtan Fichet de Clairfontaine, Axel Donath, A. W. Chen, Riaan Steenkamp, Fabian Schüssler, Emmanuel Moulin, Thomas Bylund, Rowan Batzofin, Jacques Muller, Hector Rueda Ricarte, Louis Du Plessis, Anu Kundu, D. Malyshev, Ira Jung, Sebastian Panny, Gerd Puehlhofer, Lei Sun, Alexandre Marcowith, Felix Werner, and Arnaud Mares
Subjects: Physics, Astrophysics::High Energy Astrophysical Phenomena, media_common.quotation_subject, Gravitational collapse, Evaporation, Order (ring theory), Primordial black hole, Astrophysics, Radiation, Universe, media_common, Hawking radiation
Abstract: Primordial Black Holes are expected to be formed in the early Universe by the gravitational collapse of overdense regions, among other mechanisms. They are also expected to loose their mass over time by the Hawking radiation process. As the rates of this radiation increase with temperature, the PBH evaporation should result in a violent explosion. The current upper limits on explosion rates are on the order of 10$^{4}$ − 10$^{5}$pc$^{-3}$yr$^{-1}$. In this contribution we'll present the results of a search for TeV γ-ray burst within timescale of few seconds, using nearly 5000 hours of H.E.S.S. data. The search algorithm and statistical estimation strategy will be presented as well as cosmological implications of this measurement.
Published: 2022

8. Detection of new Extreme BL Lac objects with H.E.S.S. and Swift XRT

Author: Angel Priyana Noel, Hassan Abdalla, Felix Aharonian, Faical Ait-Benkhali, Oguzhan Anguener, Cornelia Arcaro, Celine Armand, Tom Armstrong, Halim Ashkar, Michael Backes, Vardan Baghmanyan, Victor Barbosa Martins, Anna Barnacka, Monica Barnard, Rowan William Batzofin, Yvonne Becherini, David Berge, Konrad Bernloehr, Baiyang Bi, Markus Böttcher, Catherine Boisson, Julien Bolmont, Mathieu Bony (de), Mischa Breuhaus, Robert Brose, Francois Brun, Tomasz Bulik, Thomas Bylund, Floriane Cangemi, Sami Caroff, Sabrina Casanova, Jaqueline Catalano, Pauline Chambery, Tej Bahadur Chand, Andrew Chen, Garret Cotter, Malgorzata Curlo, Hannah Dalgleish, Jean Damascene Mbarubucyeye, Isak Delberth Davids, James Davies, Justine Devin, Arache Djannati-Ataï, Anton Dmytriev, Axel Donath, Victor Doroshenko, Lente Dreyer, Louis Du Plessis, Connor Duffy, Kathrin Egberts, Sabrina Einecke, Jean-Pierre ERNENWEIN, Steven Fegan, Kirsty Feijen, Armand Fiasson, Gaëtan Fichet de Clairfontaine, Gerard Fontaine, Lott Frans, Matthias Fuessling, Stefan Funk, Stefano Gabici, Yves Gallant, Gianluca Giavitto, Luca Giunti, Dorit Glawion, Jean-Francois Glicenstein, Marie-Hélène Grondin, Sumari Hattingh, Maria Haupt, German HERMANN, Jim Hinton, Werner Hofmann, Clemens Hoischen, Tim Holch, Markus Holler, Dieter Horns, Zhi-Qiu Huang, David Huber, Mario Hörbe, Marek Jamrozy, Felix Jankowsky, Vikas Joshi, Ira JUNG, Eli Kasai, Krzysztof Katarzynski, Ulì Katz, Dmitry Khangulyan, Bruno Khelifi, Stefan Klepser, Wlodek Kluzniak, Nukri Komin, Ruslan Konno, Karl Kosack, Dmitriy Kostunin, Michael Kreter, Gašper Kukec Mezek, Anu Kundu, Giovanni Lamanna, Sebastien Le Stum, Anne Lemiere, Marianne Lemoine-Goumard, Jean-Philippe Lenain, Fabian Leuschner, Christelle Levy, Thomas Lohse, Anna Luashvili, Iryna Lypova, Jonathan Mackey, Jhilik Majumdar, Denys Malyshev, Dmitry Malyshev, Vincent Marandon, Paolo Marchegiani, Alexandre Marcowith, Arnaud Mares, Guillem Martí-Devesa, Ramin Marx, Gilles Maurin, Pieter Meintjes, Manuel Meyer, Alison Mitchell, Rafal Moderski, Lars Mohrmann, Alessandro Montanari, Chris Moore, Paul Morris, Emmanuel Moulin, Jacques Muller, Thomas Murach, Kaori Nakashima, Mathieu Naurois (de), Amid Nayerhoda, Hambeleleni Davids, Jacek Niemiec, Paul O'Brien, Laenita Lorraine Oberholzer, Stefan Ohm, Laura Olivera-Nieto, Emma Ona-Wilhelmi (de), Michal Ostrowski, Sebastian Panny, Michael Panter, Dan Parsons, Giada Peron, Santiago Pita, Vincent Poireau, Dmitry A Prokhorov, Heike Prokoph, Gerd PUEHLHOFER, Michael Punch, Andreas Quirrenbach, Patrick Reichherzer, Anita Reimer, Olaf Reimer, Quentin Remy, Matthieu Renaud, Brian Reville, Frank Rieger, Carlo Romoli, Gavin P Rowell, Bronislaw Rudak, Hector Rueda Ricarte, Edna Ruiz Velasco, Vardan Sahakian, Simon Sailer, Heiko Salzmann, David Sanchez, Andrea Santangelo, Manami Sasaki, Johannes Schaefer, Hester Schutte, Ullrich Schwanke, Fabian Schüssler, Mohanraj Senniappan, Albert Seyffert, Jimmy N.S. Shapopi, Kleopas Shiningayamwe, Rachel Simoni, Atreyee Sinha, Helene Sol, Hugh Spackman, Andreas Specovius, Samuel Timothy Spencer, Marion Spir-Jacob, Lukasz Stawarz, Riaan Steenkamp, Christian Stegmann, Simon Steinmassl, Constantin Steppa, Lei Sun, Tadayuki Takahashi, Takaaki Tanaka, Thomas Tavernier, Andrew Taylor, Regis Terrier, Hannes Thiersen, Charles Thorpe-Morgan, Martin Tluczykont, Lenka Tomankova, Michelle Tsirou, Naomi Tsuji, Richard Tuffs, Yasunobu Uchiyama, Johann van der Walt, Christopher van Eldik, Carlo van Rensburg, Brian van Soelen, George Vasileiadis, Johannes Veh, Christo Venter, Pascal Vincent, Jacco Vink, Heinrich J. Völk, Stefan Wagner, Jason John Watson, Felix Werner, Richard White, Alicja Wierzcholska, Yu Wun Wong, Hend Mahmoud Yassin, Anke Yusafzai, Michael Zacharias, Roberta Zanin, Davit Zargaryan, Andrzej Zdziarski, Andreas Zech, Sylvia Zhu, Andreas Zmija, Samuel Zouari, Natalia Żywucka, Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), H.E.S.S., and Fermi-LAT
Subjects: accelerator, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics, gamma ray: absorption, VHE, law.invention, blazar, X-ray, particle: acceleration, law, HESS, synchrotron, Radiative transfer, TeV, High Energy Stereoscopic System, 10. No inequality, Absorption (electromagnetic radiation), Blazar, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Range (particle radiation), energy: high, redshift, Redshift, Synchrotron, Particle acceleration, spectral, Astrophysics - High Energy Astrophysical Phenomena, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract: Extreme high synchrotron peaked blazars (EHBLs) are amongst the most powerful accelerators found in nature. Usually the synchrotron peak frequency of an EHBL is above $10^{17}\,$Hz, i.e., lies in the range of medium to hard X-rays making them ideal sources to study particle acceleration and radiative processes. EHBL objects are commonly observed at energies beyond several TeV, making them also powerful probes of gamma-ray absorption in the intergalactic medium. During the last decade, several attempts have been made to increase the number of EHBL detected at TeV energies and probe their spectral characteristics. Here we report new detections of EHBLs in the TeV energy regime, each at a redshift of less than 0.2, by the High Energy Stereoscopic System (H.E.S.S.). Also, we report on X-ray observations of these EHBLs candidates with Swift XRT. In conjunction with the very high energy observations, this allows us to probe the radiation mechanisms and the underlying particle acceleration processes., Proceedings of the 37th International Cosmic Ray Conference (ICRC 2021)
Published: 2022
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9. H.E.S.S. ToO program on nearby core-collapse Supernovae : search for very-high energy γ-ray emission towards the SN candidate AT2019krl in M74

Author: German Hermann, Paul Morris, Tadayuki Takahashi, Victor Doroshenko, Ramin Marx, Marek Jamrozy, E. Kasai, Jean-Pierre Ernenwein, Helene Sol, M. Panter, Denys Malyshev, U. Katz, Stefan Klepser, Alessandro Montanari, Markus Boettcher, Jacek Niemiec, Johannes Veh, Olaf Reimer, Regis Terrier, Robert Brose, M.-H. Grondin, Paolo Marchegiani, Matthieu Renaud, Stefan Ohm, Faical Ait-Benkhali, Thomas Murach, Carlo Romoli, Frank M. Rieger, Constantin Steppa, T. Chand, Laura Olivera-Nieto, Mohanraj Senniappan, G. Peron, Stefano Gabici, A. Yusafzai, Garret Cotter, Zhiqiu Huang, D. A. Prokhorov, K. Kosack, Ullrich Schwanke, Johannes Schaefer, Sébastien Le Stum, Jean Damascene Mbarubucyeye, Wlodek Kluzniak, Arache Djannati-Ataï, Hannah Dalgleish, P. Reichherzer, Santiago Pita, Justine Devin, Hambeleleni Ndiyavala, Martin Tluczykont, Maria Haupt, J. Bolmont, G. Lamanna, M. Hörbe, Albert Seyffert, Isak Delberth Davids, A. Fiasson, Rachel Simoni, Roberta Zanin, P. T. O'Brien, Samuel Timothy Spencer, Brian Reville, Connor Duffy, C. Levy, James Davies, Dmitriy Kostunin, Gašper Kukec Mezek, Michal Ostrowski, Michael Backes, R. J. Tuffs, B. Bi, J.-P. Lenain, Jaqueline Catalano, Hugh Spackman, Dan Parsons, Halim Ashkar, Fabian Leuschner, Atreyee Sinha, Mathieu Bony, Oguzhan Anguener, S. J. Fegan, Brian van Soelen, N. Zywucka, Mischa Breuhaus, Pauline Chambery, Anton Dmytriiev, Laenita Lorraine Oberholzer, K. Nakashima, Christo Venter, Hend Yassin, Tim Holch, Kirsty Feijen, M. Fuessling, R. Konno, Manami Sasaki, Anna Barnacka, Markus Holler, Q. Remy, Felix Jankowsky, Manuel Meyer, Francois Brun, Andrew Taylor, Vikas Joshi, K. Bernloehr, P. Vincent, Anita Reimer, Krzysztof Katarzynski, Naomi Tsuji, Stefan Funk, Andrea Santangelo, Alicja Wierzcholska, Mathieu Naurois, Thomas Tavernier, Catherine Boisson, Floriane Cangemi, Gerard Fontaine, Anne Lemiere, Felix Aharonian, B. Rudak, V. Poireau, Kathrin Egberts, Jimmy N.S. Shapopi, S. Steinmassl, Sami Caroff, Heiko Salzmann, Hester Schutte, Jhilik Majumdar, Heinrich J. Völk, Andreas Specovius, Lukasz Stawarz, G. Vasileiadis, Richard White, Victor Barbosa Martins, Andreas Zmija, Jacco Vink, M. Lemoine-Goumard, Yu Wun Wong, Alison Mitchell, Jason John Watson, Celine Armand, David Huber, Andreas Quirrenbach, Sabrina Casanova, Emma Ona-Wilhelmi, Michael Kreter, Vincent Marandon, Hannes Thiersen, Guillem Marti'i-Devesa, Nukri Komin, Tom Armstrong, L. Giunti, Vardan Baghmanyan, Michael Zacharias, Christian Stegmann, Thomas Lohse, Stefan Wagner, Andreas Zech, Yasunobu Uchiyama, L. Mohrmann, Carlo van Rensburg, C. Arcaro, Christopher van Eldik, Samuel Zouari, Rafal Moderski, V. Sahakian, David Sanchez, Gavin Rowell, Michelle Tsirou, Yves Gallant, Kleopas Shiningayamwe, Werner Hofmann, Sabrina Einecke, Edna Ruiz Velasco, Iryna Lypova, Yvonne Becherini, Lenka Tomankova, Heike Prokoph, Monica Barnard, Marion Spir-Jacob, Amid Nayerhoda, Gilles Maurin, J. F. Glicenstein, Sylvia Zhu, P. J. Meintjes, David Berge, Bruno Khelifi, Jim Hinton, S. Sailer, Dmitry Khangulyan, Charles Thorpe-Morgan, Hassan Abdalla, Davit Zargaryan, Gaëtan Fichet de Clairfontaine, Axel Donath, A. W. Chen, Fabian Schüssler, Emmanuel Moulin, Gianluca Giavitto, Ira Jung, Sebastian Panny, Louis Du Plessis, Sumari Hattingh, Gerd Puehlhofer, Lei Sun, Thomas Bylund, Rowan Batzofin, Takaaki Tanaka, Alexandre Marcowith, Felix Werner, Jacques Muller, Anna Luashvili, Stuart Ryder, Lott Frans, Arnaud Mares, Hector Rueda Ricarte, Angel Noel, Jonathan Mackey, C. Moore, Dorit Glawion, D. Malyshev, Tomasz Bulik, Riaan Steenkamp, Malgorzata Curlo, Lente Dreyer, Anu Kundu, Michael Punch, Dieter Horns, Clemens Hoischen, A. A. Zdziarski, and Johann van der Walt
Subjects: Core (optical fiber), Physics, Supernova, High energy, Gamma ray, Collapse (topology), Astrophysics
Abstract: While the youngest known supernova remnants (SNRs), such as Cassiopeia A (Cas A), have been proven to be able to accelerate cosmic rays (CRs) only up to ∼ 10$^{14}$ eV at their present evolutionary stages, recent studies have shown that particle energies larger than a few PeV (10$^{15}$ eV) could be reached during the early stages of a core-collapse Supernova (cc-SN), when the high-velocity forward shock expands into the dense circumstellar medium (CSM) shaped by the stellar progenitor wind. Such environments, in particular the type IIn SNe whose progenitors may exhibit mass loss rates as high as 10$^{-2}$ M$_{\bigodot}$ yr$^{-1}$, could thus lead to γ-ray emission from $\pi ^{0}$ decay in hadronic interactions, potentially detectable with current Cherenkov telescopes at very-high energies. Such a detection would provide direct evidence for efficient acceleration of CR protons/nuclei in supernovae, and hence new insights on the long-standing issue of the origin of Galactic Cosmic Rays. In that context, the High Energy Stereoscopic System (H.E.S.S.) has been carrying out a Target of Opportunity program since 2016 to search for such an early very-high-energy γ-ray emission towards nearby core-collapse supernovae and supernova candidates (up to ∼ 10 Mpc), within a few weeks after discovery. After giving an overview of this H.E.S.S. Target of Opportunity program, we present the results obtained from the July 2019 observations towards the transient AT2019krl, originally classified as a type IIn supernova, which occurred in the galaxy M74 at ∼ 9.8 Mpc. Although its nature still remains unclear, the derived H.E.S.S. constraints on this transient are placed in the general context of the expected VHE γ-ray emission from core-collapse supernovae.
Published: 2022

10. Limits on Diffuse Dark Matter with HAWC

Author: Eduardo Moreno Barbosa, Ramiro Torres Escobedo, Fernando Garfias, Thomas Weisgarber, Laura Olivera-Nieto, Nicola Omodei, Ian Herzog, Diego Garcia Aguilar, Juan de Dios Álvarez Romero, Arturo Iriarte, Segev BenZvi, Luis Villaseñor, Jorge Luis Flores, Ibrahim Torres, Hugo Alberto Ayala Solares, William H. Lee, James Ryan, Samridha Kunwar, Israel Martinez Castellanos, Wayne Robert Springer, Hannah Jhee, Julie McEnery, Chang Dong Rho, Roberto Noriega-Papaqui, Arnulfo Zepeda, Hazal Goksu, Jorge Cotzomi, Nissim Illich Fraija, Josefa Becerra Gonzalez, Ignacio Taboada, Brian Fick, Oscar Chaparro-Amaro, Mora Durocher, J. A. Goodman, Eucario Gonzalo Pérez Pérez, Lorenzo Diaz, Ernesto Belmont-Moreno, Ruben Lopez-Coto, Ruben Alfaro, Yunior Pérez Araujo, Anna Lia Longinotti, Jim Hinton, Sergio Hernández Cadena, Jason Fan, Petra Hüntemeyer, Jason Lee, Daniel Rosa-Gonzalez, Elijah Willox, Rishi Babu, Humberto Ibarguen Salazar, Kelly Malone, Mateo Fernandez Alonso, Mehr Nisa, Ian James Watson, Gerd J. Kunde, Maria Magdalena González, Hermes Leon Vargas, David Kieda, Eduardo de la Fuente, Michael Schneider, Filiberto Hueyotl-Zahuantitla, Amid Nayerhoda, Vincent Marandon, Alberto Carramiñana, John Matthews, Lukas Nellen, Jose Luis García-Luna, Miguel Mostafa, Karen S. Caballero Mora, Felix Werner, Hao Zhou, Cederik León de León, Robert Ellsworth, Raquel Diaz Hernandez, Vardan Baghmanyan, Guillermo García-Torales, Arun Babu Kollamparambil, Binita Hona, Umberto Cotti, Sabrina Casanova, Oscar Martinez, Brian Humensky, Francisco Salesa Greus, Ke Fang, María Catalina Espinoza Hernández, Jorge Antonio Morales Soto, Tomás Capistrán, Joshua Wood, Pooja Surajbali, Andrés Sandoval, Gus Sinnis, Alison Peisker, Anushka Udara Abeysekara, Andrew James Smith, Fernando Ureña-Mena, Gaurang Yodh, Henrike Fleischhack, Kristi Engel, Andrea Albert, Jose Andres Garcia-Gonzalez, Juan Carlos Arteaga Velazquez, Ahron S. Barber, Meghan Tanner, Colas Rivière, Jesús Martínez-Castro, Juan Carlos Díaz Vélez, Armelle Jardin-Blicq, Rhiannon Turner, Chad Brisbois, José Roberto Angeles Camacho, César Alvarez, Sara Coutiño de Leon, Vikas Joshi, Alejandro Lara, Gilgamesh Luis-Raya, Michael DuVernois, Kirsten Tollefson, Harm Schoorlemmer, David Berley, Michael Newbold, Hawc, Pedro Miranda-Romagnoli, Xiaojie Wang, Joe Lundeen, Michelle Hui, J. Patrick Harding, Humberto Martínez Huerta, Edna Ruiz-Velasco, Dirk Lennarz, Gwenael Giacinti, José Serna-Franco, J. T. Linnemann, Brenda Dingus, Daniel Omar Avila Rojas, and Dezhi Huang
Subjects: Physics, Dark matter, Astrophysics
Published: 2021
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11. Limits on the Diffuse Gamma-Ray Background with HAWC

Author: Ernesto Belmont-Moreno, Juan Carlos Arteaga Velazquez, Gerd J. Kunde, Jim Hinton, Sergio Hernández Cadena, Meghan Tanner, Colas Rivière, Eduardo Moreno Barbosa, Dirk Lennarz, José Serna-Franco, Elijah Willox, Harm Schoorlemmer, Samridha Kunwar, Jesús Martínez-Castro, Israel Martinez Castellanos, Segev BenZvi, J. T. Linnemann, Dezhi Huang, Vikas Joshi, Hannah Jhee, Ruben Lopez-Coto, Juan Carlos Díaz Vélez, Hawc, Eucario Gonzalo Pérez Pérez, David Berley, Armelle Jardin-Blicq, Yunior Pérez Araujo, Anna Lia Longinotti, Gilgamesh Luis-Raya, Xiaojie Wang, Guillermo García-Torales, Joe Lundeen, Diego Garcia Aguilar, Kirsten Tollefson, Rhiannon Turner, Nissim Illich Fraija, Chad Brisbois, Arun Babu Kollamparambil, Brenda Dingus, Pedro Miranda-Romagnoli, Ke Fang, Daniel Omar Avila Rojas, Jorge Luis Flores, Ibrahim Torres, Juan de Dios Álvarez Romero, Alejandro Lara, Ahron S. Barber, Fernando Garfias, José Roberto Angeles Camacho, Michael Schneider, Felix Werner, Ian Herzog, William H. Lee, Jason Fan, Julie McEnery, Miguel Mostafa, Rishi Babu, Kelly Malone, Josefa Becerra Gonzalez, Michael DuVernois, Ignacio Taboada, Cederik León de León, Gwenael Giacinti, Chang Dong Rho, Michael Newbold, Thomas Weisgarber, Laura Olivera-Nieto, Michelle Hui, Vincent Marandon, Alberto Carramiñana, J. A. Goodman, Ruben Alfaro, Humberto Ibarguen Salazar, Robert Ellsworth, Raquel Diaz Hernandez, Vardan Baghmanyan, Alison Peisker, Andrew James Smith, César Alvarez, Mehr Nisa, Ian James Watson, Jason Lee, Arnulfo Zepeda, Hazal Goksu, Daniel Rosa-Gonzalez, Henrike Fleischhack, Umberto Cotti, Brian Fick, Lorenzo Diaz, David Kieda, Francisco Salesa Greus, Sabrina Casanova, Maria Magdalena González, Joshua Wood, Eduardo de la Fuente, Kristi Engel, Jorge Cotzomi, Filiberto Hueyotl-Zahuantitla, Hermes Leon Vargas, María Catalina Espinoza Hernández, Jorge Antonio Morales Soto, Tomás Capistrán, John Matthews, Anushka Udara Abeysekara, Hugo Alberto Ayala Solares, Oscar Martinez, Jose Luis García-Luna, Roberto Noriega-Papaqui, Oscar Chaparro-Amaro, James Ryan, Wayne Robert Springer, Amid Nayerhoda, Brian Humensky, Pooja Surajbali, Andrés Sandoval, Gus Sinnis, Fernando Ureña-Mena, Gaurang Yodh, Mora Durocher, Petra Hüntemeyer, Binita Hona, Mateo Fernandez Alonso, Karen S. Caballero Mora, Luis Villaseñor, Jose Andres Garcia-Gonzalez, Sara Coutiño de Leon, Edna Ruiz-Velasco, J. Patrick Harding, Ramiro Torres Escobedo, Humberto Martínez Huerta, Nicola Omodei, Arturo Iriarte, Lukas Nellen, Hao Zhou, and Andrea Albert
Subjects: Physics, Gamma ray, Astrophysics
Published: 2021
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12. CONSTRAINTS ON THE VERY HIGH ENERGY GAMMA-RAY EMISSION WITH HAWC

Author: Yunior Frainen Pérez, Maria Magdalena González, Nissim Illich Fraija, Anushka Udara Abeysekara, Andrea Albert, Ruben Alfaro, César Alvarez, Juan de Dios Álvarez Romero, José Roberto Angeles Camacho, Juan Carlos Arteaga Velazquez, Arun Babu Kollamparambil, Daniel Omar Avila Rojas, Hugo Alberto Ayala Solares, Rishi Babu, Vardan Baghmanyan, Ahron S. Barber, Josefa Becerra González, Ernesto Belmont-Moreno, Segev BenZvi, David Berley, Chad Brisbois, Karen S. Caballero Mora, Tomás Capistrán Rojas, Alberto Carramiñana, Sabrina Casanova, Oscar Chaparro-Amaro, Umberto Cotti, Jorge Cotzomi, Sara Coutiño de León, Eduardo de la Fuente, Cederik León de León, Lorenzo Diaz, Raquel Diaz Hernandez, Juan Carlos Díaz Vélez, Brenda Dingus, Mora Durocher, Michael DuVernois, Robert Ellsworth, Kristi Engel, María Catalina Espinoza Hernández, Jason Fan, Ke Fang, Mateo Fernandez Alonso, Brian Fick, Henrike Fleischhack, Jorge Luis Flores, Diego Garcia Aguilar, Jose Andres Garcia-Gonzalez, Jose Luis García-Luna, Guillermo García-Torales, Fernando Garfias, Gwenael Giacinti, Hazal Goksu, Jordan A. Goodman, J. Patrick Harding, Sergio Hernández Cadena, Ian Herzog, Jim Hinton, Binita Hona, Dezhi Huang, Filiberto Hueyotl-Zahuantitla, Michelle Hui, Brian Humensky, Petra Hüntemeyer, Arturo Iriarte, Armelle Jardin-Blicq, Hannah Jhee, Vikas Joshi, David Kieda, Gerd J. Kunde, Samridha Kunwar, Alejandro Lara, Jason LEE, William H. Lee, Dirk Lennarz, Hermes Leon Vargas, Jim Linnemann, Anna Lia Longinotti, Rubén López-Coto, Gilgamesh Luis-Raya, Joe Lundeen, Kelly Malone, Vincent Marandon, Oscar M Martinez, Israel Martinez Castellanos, Humberto Martínez Huerta, Jesús Martínez-Castro, John Matthews, Julie McEnery, Pedro Miranda-Romagnoli, Jorge Antonio Morales Soto, Eduardo Moreno Barbosa, Miguel Mostafa, Amid Nayerhoda, Lukas Nellen, Michael Newbold, Mehr Un Nisa, Roberto Noriega-Papaqui, Laura Olivera-Nieto, Nicola Omodei, Alison Peisker, Eucario Gonzalo Pérez Pérez, Chang Dong Rho, Colas Rivière, Daniel Rosa-Gonzalez, Edna Ruiz-Velasco, James Ryan, Humberto Ibarguen Salazar, Francisco Salesa Greus, Andrés Sandoval, Michael Schneider, Harm Schoorlemmer, José Serna-Franco, Gus Sinnis, Andrew James Smith, Wayne Robert Springer, Pooja Surajbali, Ignacio Taboada, Meghan Tanner, Kirsten Tollefson, Ibrahim Torres, Ramiro Torres Escobedo, Rhiannon M. Turner, Fernando Josue Urena Mena, Luis Villaseñor, Xiaojie Wang, Ian James Watson, Thomas Weisgarber, Felix Werner, Elijah Job Willox, Joshua Wood, Gaurang Yodh, Arnulfo Zepeda, and Hao Zhou
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE), Physics, High energy, Astrophysics::High Energy Astrophysical Phenomena, Gamma ray, Phase (waves), FOS: Physical sciences, Context (language use), Astrophysics, Parameter space, Light curve, Synchrotron, law.invention, Afterglow, law, Astrophysics - High Energy Astrophysical Phenomena
Abstract: Gamma-ray bursts (GRBs) are among the most luminous sources in the universe. The nature of their emission at TeV energies is one of the most relevant open issues related to these events. The temporal and spectral features inferred from the early and late emissions usually known as prompt and afterglow, respectively, can be interpreted within the context of the fireball model. The synchrotron self-Compton process is expected during the afterglow phase. We explain how the theoretical SSC light curves can be compared with hypothetical upper limit located at z=0.3. We show the allowed parameter space of the microphysical parameters and density of the circumburst medium. The most restrictive results are obtained when the SSC process lies in the fast cooling regime, Comment: Presented at the 37th International Cosmic Ray Conference(ICRC2021),Berlin, Germany-online
Published: 2021
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13. Is PKS 0625-354 another variable TeV active galactic nucleus?

Author: Halim Ashkar, Fabian Leuschner, Gilles Maurin, Riaan Steenkamp, J. F. Glicenstein, Heike Prokoph, Bruno Khelifi, Floriane Cangemi, Michael Punch, Gianluca Giavitto, Anna Luashvili, Lott Frans, Sumari Hattingh, Martin Tluczykont, Marek Jamrozy, Sabrina Einecke, Takaaki Tanaka, Iryna Lypova, Marion Spir-Jacob, Yvonne Becherini, Helene Sol, Rachel Simoni, Davit Zargaryan, Hannah Dalgleish, Jim Hinton, Gašper Kukec Mezek, Gaëtan Fichet de Clairfontaine, Axel Donath, A. W. Chen, S. Sailer, Dmitry Khangulyan, Charles Thorpe-Morgan, Andreas Zmija, Amid Nayerhoda, M. Lemoine-Goumard, Stefan Klepser, Alessandro Montanari, C. Arcaro, S. J. Fegan, Anu Kundu, B. Rudak, T. Chand, Hend Yassin, Michael Kreter, Paolo Marchegiani, Tadayuki Takahashi, Dmitriy Kostunin, Mathieu Bony, Oguzhan Anguener, Fabian Schüssler, Manuel Meyer, Markus Boettcher, Gavin Rowell, Kathrin Egberts, Maria Haupt, Victor Doroshenko, Emmanuel Moulin, Ira Jung, Brian van Soelen, Sebastian Panny, Mathieu Naurois, E. Kasai, Kirsty Feijen, Samuel Timothy Spencer, Dieter Horns, Vikas Joshi, Thomas Tavernier, Johannes Schaefer, Gerd Puehlhofer, Lei Sun, Constantin Steppa, Jacek Niemiec, Hassan Abdalla, Albert Seyffert, Olaf Reimer, Christian Stegmann, Stefan Wagner, Andreas Zech, Alexandre Marcowith, Regis Terrier, Felix Werner, Yasunobu Uchiyama, K. Nakashima, K. Bernloehr, Carlo Romoli, Hector Rueda Ricarte, Lukasz Stawarz, Frank M. Rieger, Thomas Murach, Kleopas Shiningayamwe, Clemens Hoischen, A. A. Zdziarski, Christopher van Eldik, N. Zywucka, Jaqueline Catalano, L. Mohrmann, Monica Barnard, Rafal Moderski, Heinrich J. Völk, Arnaud Mares, Ullrich Schwanke, Stefan Ohm, Thomas Bylund, Rowan Batzofin, Anita Reimer, Andreas Quirrenbach, Edna Ruiz Velasco, Johann van der Walt, Jhilik Majumdar, Guillem Marti'i-Devesa, R. Konno, Jacques Muller, Dan Parsons, Jean Damascene Mbarubucyeye, Wlodek Kluzniak, Lenka Tomankova, Stefano Gabici, Andrew Taylor, Michael Zacharias, Christo Venter, Sylvia Zhu, P. J. Meintjes, David Berge, M. Hörbe, Michael Backes, Robert Brose, V. Poireau, Jimmy N.S. Shapopi, V. Sahakian, Krzysztof Katarzynski, Brian Reville, Connor Duffy, Laenita Lorraine Oberholzer, Tim Holch, Anton Dmytriiev, M. Fuessling, Manami Sasaki, G. Vasileiadis, Catherine Boisson, Arache Djannati-Ataï, P. Reichherzer, J. Bolmont, Jason John Watson, D. Malyshev, Andrea Santangelo, Naomi Tsuji, Matthieu Renaud, Denys Malyshev, Isak Delberth Davids, G. Lamanna, James Davies, A. Fiasson, Roberta Zanin, Yves Gallant, S. Steinmassl, Sami Caroff, R. J. Tuffs, Gerard Fontaine, B. Bi, Santiago Pita, Hambeleleni Ndiyavala, Hester Schutte, Justine Devin, Mohanraj Senniappan, C. Levy, Mischa Breuhaus, Pauline Chambery, Andreas Specovius, Jean-Pierre Ernenwein, Yu Wun Wong, Johannes Veh, Vincent Marandon, Hannes Thiersen, Vardan Baghmanyan, Markus Holler, Q. Remy, Felix Jankowsky, Richard White, Felix Aharonian, Jacco Vink, Alison Mitchell, David Huber, Sabrina Casanova, Louis Du Plessis, Angel Noel, Jonathan Mackey, Anna Barnacka, C. Moore, Victor Barbosa Martins, Dorit Glawion, Carlo van Rensburg, Anne Lemiere, Tomasz Bulik, Malgorzata Curlo, Emma Ona-Wilhelmi, Samuel Zouari, Thomas Lohse, Lente Dreyer, Michal Ostrowski, J.-P. Lenain, Hugh Spackman, Stefan Funk, Alicja Wierzcholska, Ramin Marx, M. Panter, U. Katz, Faical Ait-Benkhali, G. Peron, Garret Cotter, Sébastien Le Stum, Zhiqiu Huang, D. A. Prokhorov, K. Kosack, P. T. O'Brien, Atreyee Sinha, Laura Olivera-Nieto, A. Yusafzai, Nukri Komin, Tom Armstrong, David Sanchez, Werner Hofmann, L. Giunti, Michelle Tsirou, Francois Brun, P. Vincent, Heiko Salzmann, Celine Armand, M.-H. Grondin, German Hermann, and Paul Morris
Subjects: Physics, Brightness, Active galactic nucleus, Astrophysics::High Energy Astrophysical Phenomena, Flux, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Viewing angle, Variable (computer science), symbols.namesake, symbols, Spectral energy distribution, Blazar, Doppler effect, Astrophysics::Galaxy Astrophysics
Abstract: The majority of the active galactic nuclei (AGN) detected at very-high-energies above 100 GeV belong to the class of blazars with a small angle between the jet-axis and the line-of-sight. Only about 10 percent of the gamma-ray AGN are objects with a larger viewing angle resulting in a smaller Doppler boosting of the emission. Originally, it was believed that gamma-ray emission can only be observed from blazars and those are variable in its brightness. Instead, the last years have shown that non-blazar active galaxies also show a fascinating variability behaviour which provide important new insights into the physical processes responsible for the gamma-ray production and especially for flaring events. Here, we report on the observation of gamma-ray variability of the active galaxy PKS 0625−354 detected with the H.E.S.S. telescopes in November 2018. The classification of PKS 0625−354 is a still matter of debate. The H.E.S.S. measurements were performed as part of a flux observing program and showed in the first night of the observation a detection of the object with > 5σ. A denser observation campaign followed for the next nine nights resulting in a decrease of the gamma-ray flux. Those observations were accompanied with Swift in the X-ray and UV/optical band allowing for the reconstruction of a multi-band broad-band spectral energy distribution. We will discuss the implications of the gamma-ray variability of the object.
Published: 2021
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14. Monitoring the radio galaxy M87 with HAWC

Author: Tomás Capistrán, Daniel Omar Avila Rojas, Maria Magdalena González, Nissim Illich Fraija, Ruben Alfaro, Anushka Udara Abeysekara, Andrea Albert, César Alvarez, Juan de Dios Álvarez Romero, José Roberto Angeles Camacho, Juan Carlos Arteaga Velazquez, Arun Babu Kollamparambil, Hugo Alberto Ayala Solares, Rishi Babu, Vardan Baghmanyan, Ahron S. Barber, Josefa Becerra Gonzalez, Ernesto Belmont-Moreno, Segev BenZvi, David Berley, Chad Brisbois, Karen S. Caballero Mora, Alberto Carramiñana, Sabrina Casanova, Oscar Chaparro-Amaro, Umberto Cotti, Jorge Cotzomi, Sara Coutiño de León, Eduardo de la Fuente, Cederik León de León, Lorenzo Diaz, Raquel Diaz Hernandez, Juan Carlos Díaz Vélez, Brenda Dingus, Mora Durocher, Michael DuVernois, Robert Ellsworth, Kristi Engel, María Catalina Espinoza Hernández, Jason Fan, Ke Fang, Mateo Fernandez Alonso, Brian Fick, Henrike Fleischhack, Jorge Luis Flores, Diego Garcia Aguilar, Jose Andres Garcia-Gonzalez, Jose Luis García-Luna, Guillermo García-Torales, Fernando Garfias, Gwenael Giacinti, Hazal Goksu, Jordan A. Goodman, J. Patrick Harding, Sergio Hernández Cadena, Ian Herzog, Jim Hinton, Binita Hona, Dezhi Huang, Filiberto Hueyotl-Zahuantitla, Michelle Hui, Brian Humensky, Petra Hüntemeyer, Arturo Iriarte, Armelle Jardin-Blicq, Hannah Jhee, Vikas Joshi, David Kieda, Gerd J. Kunde, Samridha Kunwar, Alejandro Lara, Jason LEE, William H. Lee, Dirk Lennarz, Hermes Leon Vargas, Jim Linnemann, Anna Lia Longinotti, Ruben Lopez-Coto, Gilgamesh Luis-Raya, Joe Lundeen, Kelly Malone, Vincent Marandon, Oscar M Martinez, Israel Martinez Castellanos, Humberto Martínez Huerta, Jesús Martínez-Castro, John Matthews, Julie McEnery, Pedro Miranda-Romagnoli, Jorge Antonio Morales Soto, Eduardo Moreno Barbosa, Miguel Mostafa, Amid Nayerhoda, Lukas Nellen, Michael Newbold, Mehr Un Nisa, Roberto Noriega-Papaqui, Laura Olivera-Nieto, Nicola Omodei, Alison Peisker, Yunior Pérez Araujo, Eucario Gonzalo Pérez Pérez, Chang Dong Rho, Colas Rivière, Daniel Rosa-Gonzalez, Edna Ruiz-Velasco, James Ryan, Humberto Ibarguen Salazar, Francisco Salesa Greus, Andrés Sandoval, Michael Schneider, Harm Schoorlemmer, José Serna-Franco, Gus Sinnis, Andrew James Smith, Wayne Robert Springer, Pooja Surajbali, Ignacio Taboada, Meghan Tanner, Kirsten Tollefson, Ibrahim Torres, Ramiro Torres Escobedo, Rhiannon M. Turner, Fernando Josue Urena Mena, Luis Villaseñor, Xiaojie Wang, Ian James Watson, Thomas Weisgarber, Felix Werner, Elijah Job Willox, Joshua Wood, Gaurang Yodh, Arnulfo Zepeda, and Hao Zhou
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Radio galaxy, Low activity, Radiative transfer, Northern Hemisphere, FOS: Physical sciences, Astronomy, Field of view, MAGIC (telescope), Astrophysics - High Energy Astrophysical Phenomena
Abstract: Studies of radio galaxies at TeV energies are fascinating because their jets are misaligned concerning our sightline. Thus, it provides us with a unique opportunity to study the structure of their jets, the radiative processes, and the acceleration mechanisms involved in them. In addition, some radio galaxies have presented variability in their emission, like the giant radio galaxy M87, which has reported several activity periods. Due to its duty cycle >95% and instantaneous field of view of 2 sr, HAWC provides daily monitoring of variable sources visible from the Northern Hemisphere. In this work, we show the results of monitoring M87 between January 2015 and December 2018. HAWC's observations are consistent with the low activity state reported by other instruments (like H.E.S.S and MAGIC). However, after September 2017 (~MJD 58000), the HAWC measurements of M87 show hints of higher activity., Presented at the 37th International Cosmic Ray Conference (ICRC2021), Berlin, Germany - Online
Published: 2021
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15. Search for dark matter annihilation towards the inner Milky Way halo with the H.E.S.S. Inner Galaxy Survey

Author: Clemens Hoischen, A. A. Zdziarski, Robert Brose, Johann van der Walt, Halim Ashkar, Fabian Leuschner, Stefan Ohm, L. Giunti, Albert Seyffert, Davit Zargaryan, Stefan Klepser, Alessandro Montanari, K. Nakashima, Gaëtan Fichet de Clairfontaine, Sabrina Einecke, Axel Donath, A. W. Chen, Iryna Lypova, K. Bernloehr, Heinrich J. Völk, Yvonne Becherini, Stefano Gabici, Michelle Tsirou, Anna Luashvili, Vikas Joshi, J. Bolmont, Fabian Schüssler, M.-H. Grondin, Emmanuel Moulin, Andreas Specovius, Kleopas Shiningayamwe, Anne Lemiere, B. Rudak, Lott Frans, Michael Punch, Edna Ruiz Velasco, Sylvia Zhu, P. J. Meintjes, David Berge, Michael Backes, Matthieu Renaud, German Hermann, Paul Morris, Kathrin Egberts, Constantin Steppa, Tadayuki Takahashi, Laenita Lorraine Oberholzer, Tim Holch, Lukasz Stawarz, Louis Du Plessis, Naomi Tsuji, V. Poireau, Jimmy N.S. Shapopi, Victor Doroshenko, Yu Wun Wong, Emma Ona-Wilhelmi, Riaan Steenkamp, E. Kasai, G. Lamanna, Ullrich Schwanke, Gerard Fontaine, Jim Hinton, Victor Barbosa Martins, Thomas Lohse, Frank M. Rieger, Hester Schutte, Carlo van Rensburg, Francois Brun, P. Vincent, Heiko Salzmann, Mathieu Bony, Oguzhan Anguener, Kirsty Feijen, S. Sailer, Dmitry Khangulyan, Charles Thorpe-Morgan, Ramin Marx, Dmitriy Kostunin, M. Panter, U. Katz, Jean Damascene Mbarubucyeye, Wlodek Kluzniak, Jaqueline Catalano, R. Konno, Hector Rueda Ricarte, T. Chand, Samuel Zouari, P. T. O'Brien, M. Hörbe, Celine Armand, Andreas Quirrenbach, Guillem Marti'i-Devesa, Faical Ait-Benkhali, Andrew Taylor, G. Vasileiadis, Vincent Marandon, Brian van Soelen, Marek Jamrozy, Hannes Thiersen, Dieter Horns, Hassan Abdalla, Thomas Bylund, Rowan Batzofin, Sébastien Le Stum, Thomas Tavernier, Gilles Maurin, Floriane Cangemi, Helene Sol, Christian Stegmann, Jacques Muller, Vardan Baghmanyan, Johannes Schaefer, J. F. Glicenstein, Anu Kundu, Stefan Wagner, Andreas Zech, Yasunobu Uchiyama, Monica Barnard, L. Mohrmann, Arache Djannati-Ataï, C. Levy, Atreyee Sinha, Bruno Khelifi, Michal Ostrowski, J.-P. Lenain, Hugh Spackman, Michael Zacharias, Regis Terrier, Hannah Dalgleish, P. Reichherzer, Andreas Zmija, Gianluca Giavitto, Jacek Niemiec, M. Lemoine-Goumard, Paolo Marchegiani, Markus Holler, Carlo Romoli, Isak Delberth Davids, Stefan Funk, Alicja Wierzcholska, Olaf Reimer, Q. Remy, Felix Jankowsky, Michael Kreter, Anna Barnacka, Brian Reville, Connor Duffy, A. Fiasson, Roberta Zanin, Thomas Murach, Heike Prokoph, James Davies, Sumari Hattingh, Felix Aharonian, Richard White, Angel Noel, M. Fuessling, R. J. Tuffs, B. Bi, Christo Venter, Takaaki Tanaka, D. Malyshev, Jonathan Mackey, Jacco Vink, Ira Jung, Sebastian Panny, Alison Mitchell, Anita Reimer, David Huber, Sabrina Casanova, Marion Spir-Jacob, Mischa Breuhaus, Pauline Chambery, Gerd Puehlhofer, C. Arcaro, C. Moore, Jhilik Majumdar, Lei Sun, Santiago Pita, Hambeleleni Ndiyavala, S. Steinmassl, Sami Caroff, Anton Dmytriiev, Dorit Glawion, G. Peron, Garret Cotter, Alexandre Marcowith, Felix Werner, Amid Nayerhoda, Manami Sasaki, Tomasz Bulik, Zhiqiu Huang, Malgorzata Curlo, Maria Haupt, Andrea Santangelo, Arnaud Mares, Lente Dreyer, D. A. Prokhorov, K. Kosack, V. Sahakian, Gavin Rowell, Jean-Pierre Ernenwein, N. Zywucka, Denys Malyshev, Markus Boettcher, Yves Gallant, Christopher van Eldik, Rafal Moderski, Johannes Veh, Samuel Timothy Spencer, Mohanraj Senniappan, Rachel Simoni, Dan Parsons, Krzysztof Katarzynski, Catherine Boisson, Justine Devin, Lenka Tomankova, Martin Tluczykont, Gašper Kukec Mezek, Hend Yassin, Manuel Meyer, Mathieu Naurois, Jason John Watson, S. J. Fegan, Nukri Komin, Tom Armstrong, David Sanchez, Werner Hofmann, Laura Olivera-Nieto, and A. Yusafzai
Subjects: Physics, Annihilation, WIMP, Milky Way, Weakly interacting massive particles, media_common.quotation_subject, Dark matter, Astrophysics::Cosmology and Extragalactic Astrophysics, Halo, Astrophysics, Galaxy, Universe, media_common
Abstract: The presence of dark matter (DM) is suggested by a wealth of astrophysical and cosmological measurements. However, its underlying nature is yet unknown. Among the most promising candidates are weakly interacting massive particles (WIMPs): particles with mass and coupling strength at the electroweak scale and thermally produced in the early universe have a present relic density consistent with that observed today. WIMP self-annihilation would produce Standard Model particles including gamma-rays, which have been long-time recognized as a prime messenger to indirectly detect dark matter signals. The centre of the Milky Way is predicted as the brightest source of DM annihilations. The H.E.S.S. collaboration is currently performing a survey of the inner region of the Milky Way, the Inner Galaxy Survey (IGS), intended to achieve the best sensitivity to faint and diffuse emissions in a region of several degrees around the Galactic Centre. We analyzed 2014-2020 observations taken with the five-telescope array to search for a DM annihilation signal. With the current dataset of about 550 hours, we found no significant excess and therefore derived strong constraints on the velocity-weighted annihilation cross-section. TeV thermal WIMPs can be probed in different annihilation channels.
Published: 2021
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16. Convolutional Neural Networks for Low Energy Gamma-Ray Air Shower Identification with HAWC

Author: Gwenael Giacinti, Dezhi Huang, José Serna-Franco, J. T. Linnemann, Vikas Joshi, Hawc, Brenda Dingus, Karen S. Caballero Mora, Rishi Babu, Gerd J. Kunde, Kelly Malone, Daniel Omar Avila Rojas, Juan de Dios Álvarez Romero, Dirk Lennarz, Vincent Marandon, Alberto Carramiñana, Eduardo Moreno Barbosa, William H. Lee, Raquel Diaz Hernandez, Vardan Baghmanyan, Joe Lundeen, Michael Schneider, Julie McEnery, Felix Werner, Ramiro Torres Escobedo, Jesús Martínez-Castro, Chang Dong Rho, Gilgamesh Luis-Raya, Kirsten Tollefson, Harm Schoorlemmer, Brian Humensky, Ke Fang, David Kieda, Hugo Alberto Ayala Solares, Roberto Noriega-Papaqui, Nicola Omodei, Arturo Iriarte, Segev BenZvi, Humberto Ibarguen Salazar, Ahron S. Barber, Arnulfo Zepeda, Josefa Becerra Gonzalez, David Berley, Brian Fick, Mehr Nisa, Diego Garcia Aguilar, Ian James Watson, J. A. Goodman, Robert Ellsworth, Lorenzo Diaz, Xiaojie Wang, Oscar Chaparro-Amaro, Ernesto Belmont-Moreno, Andrea Albert, Alison Peisker, Andrew James Smith, Hannah Jhee, Umberto Cotti, Binita Hona, Jim Hinton, Sergio Hernández Cadena, John Matthews, Sabrina Casanova, Miguel Mostafa, Pedro Miranda-Romagnoli, Laura Olivera-Nieto, Edna Ruiz-Velasco, Fernando Garfias, Juan Carlos Arteaga Velazquez, Jorge Luis Flores, Ibrahim Torres, Cederik León de León, Henrike Fleischhack, Meghan Tanner, Thomas Weisgarber, Jose Andres Garcia-Gonzalez, Oscar Martinez, César Alvarez, Jorge Cotzomi, Hermes Leon Vargas, Elijah Willox, Colas Rivière, Nissim Illich Fraija, Alejandro Lara, Luis Villaseñor, Ruben Lopez-Coto, Michael Newbold, Hazal Goksu, James Ryan, Yunior Pérez Araujo, Anna Lia Longinotti, Eucario Gonzalo Pérez Pérez, Michael DuVernois, Francisco Salesa Greus, Joshua Wood, Jose Luis García-Luna, Jason Fan, Rhiannon Turner, Chad Brisbois, Lukas Nellen, Sara Coutiño de Leon, Guillermo García-Torales, Arun Babu Kollamparambil, Kristi Engel, Pooja Surajbali, Andrés Sandoval, Hao Zhou, Gus Sinnis, Michelle Hui, Fernando Ureña-Mena, Gaurang Yodh, José Roberto Angeles Camacho, Samridha Kunwar, Mora Durocher, Petra Hüntemeyer, Israel Martinez Castellanos, Maria Magdalena González, Ignacio Taboada, Mateo Fernandez Alonso, Ruben Alfaro, Jason Lee, Daniel Rosa-Gonzalez, Eduardo de la Fuente, Filiberto Hueyotl-Zahuantitla, Juan Carlos Díaz Vélez, J. Patrick Harding, Armelle Jardin-Blicq, Ian Herzog, Humberto Martínez Huerta, Wayne Robert Springer, Ian Watson, María Catalina Espinoza Hernández, Jorge Antonio Morales Soto, Tomás Capistrán, Anushka Udara Abeysekara, and Amid Nayerhoda
Subjects: Physics, Identification (information), Air shower, Low energy, business.industry, Gamma ray, Pattern recognition, Artificial intelligence, business, Convolutional neural network
Published: 2021
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17. HAWC results on TeV emitting blazars

Author: Luis Villaseñor, Alejandro Lara, Brian Humensky, Tomás Capistrán Rojas, Edna Ruiz-Velasco, John Matthews, Gerd J. Kunde, Hannah Jhee, José Serna-Franco, Jose Andres Garcia-Gonzalez, Maria Magdalena González, Karen S. Caballero Mora, Michael DuVernois, Jesús Martínez-Castro, Nissim Illich Fraija, Fernando Garfias, Rishi Babu, Kelly Malone, Ruben Lopez-Coto, Vincent Marandon, Alberto Carramiñana, Thomas Weisgarber, Ke Fang, Alison Peisker, Oscar Martinez, J. T. Linnemann, Yunior Pérez Araujo, Anna Lia Longinotti, Michael Schneider, Felix Werner, Raquel Diaz Hernandez, Vardan Baghmanyan, Andrew James Smith, Jason Fan, Eduardo de la Fuente, Andrea Albert, Filiberto Hueyotl-Zahuantitla, Binita Hona, Pooja Surajbali, Andrés Sandoval, Gus Sinnis, J. Patrick Harding, Humberto Martínez Huerta, Michelle Hui, Henrike Fleischhack, Hermes Leon Vargas, Fernando Ureña-Mena, Juan Carlos Arteaga Velazquez, Miguel Mostafa, Meghan Tanner, Gaurang Yodh, Ignacio Taboada, Colas Rivière, Cederik León de León, James Ryan, Lukas Nellen, Juan Carlos Díaz Vélez, Juan de Dios Álvarez Romero, Sara Coutiño de Leon, Eduardo Moreno Barbosa, Mora Durocher, Ahron S. Barber, César Alvarez, Arnulfo Zepeda, Brian Fick, Ruben Alfaro, Petra Hüntemeyer, Vikas Joshi, Hao Zhou, Hugo Alberto Ayala Solares, Lorenzo Diaz, Eucario Gonzalo Pérez Pérez, David Kieda, Samridha Kunwar, Armelle Jardin-Blicq, Brenda Dingus, Mateo Fernandez Alonso, Roberto Noriega-Papaqui, Jason Lee, Israel Martinez Castellanos, Dirk Lennarz, Daniel Omar Avila Rojas, Jorge Cotzomi, William H. Lee, Laura Olivera-Nieto, Pedro Miranda-Romagnoli, María Catalina Espinoza Hernández, Julie McEnery, Ramiro Torres Escobedo, Segev BenZvi, Daniel Rosa-Gonzalez, Gilgamesh Luis-Raya, Jorge Antonio Morales Soto, Nicola Omodei, Guillermo García-Torales, Arun Babu Kollamparambil, Chang Dong Rho, Kirsten Tollefson, Oscar Chaparro-Amaro, Arturo Iriarte, Ian Herzog, Anushka Udara Abeysekara, Francisco Salesa Greus, Joshua Wood, Hawc, Gwenael Giacinti, Michael Newbold, Humberto Ibarguen Salazar, Joe Lundeen, Alberto Carramiñana Alonso, Jose Luis García-Luna, Robert Ellsworth, Rhiannon Turner, Harm Schoorlemmer, Chad Brisbois, Umberto Cotti, Mehr Nisa, Sabrina Casanova, José Roberto Angeles Camacho, Ian James Watson, Kristi Engel, David Berley, Xiaojie Wang, Hazal Goksu, Diego Garcia Aguilar, Jorge Luis Flores, Ibrahim Torres, Dezhi Huang, Josefa Becerra Gonzalez, J. A. Goodman, Ernesto Belmont-Moreno, Jim Hinton, Sergio Hernández Cadena, Elijah Willox, Wayne Robert Springer, and Amid Nayerhoda
Subjects: Astrophysics, Blazar
Published: 2021
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18. Studying High-Mass Microquasars with HAWC

Author: Eduardo Moreno Barbosa, Fernando Garfias, Thomas Weisgarber, Juan Carlos Díaz Vélez, Mora Durocher, Petra Hüntemeyer, Mateo Fernandez Alonso, Se Yeon Hwang, Brian Humensky, Armelle Jardin-Blicq, Hazal Goksu, Jesús Martínez-Castro, Dirk Lennarz, Francisco Salesa Greus, Andrea Albert, Joshua Wood, Jose Andres Garcia-Gonzalez, Juan Carlos Arteaga Velazquez, Meghan Tanner, Colas Rivière, Pooja Surajbali, Andrés Sandoval, Gus Sinnis, Fernando Ureña-Mena, Gaurang Yodh, J. Patrick Harding, Rhiannon Turner, Maria Magdalena González, Arnulfo Zepeda, Brian Fick, Sara Coutiño de Leon, Brenda Dingus, Daniel Omar Avila Rojas, Humberto Martínez Huerta, Chad Brisbois, Lorenzo Diaz, José Roberto Angeles Camacho, Kristi Engel, Karen S. Caballero Mora, Hannah Jhee, Gwenael Giacinti, Vikas Joshi, Eduardo de la Fuente, Edna Ruiz-Velasco, Eucario Gonzalo Pérez Pérez, Filiberto Hueyotl-Zahuantitla, Michael Schneider, Felix Werner, José Serna-Franco, Hugo Alberto Ayala Solares, Ke Fang, Wayne Robert Springer, Roberto Noriega-Papaqui, Nissim Illich Fraija, Gilgamesh Luis-Raya, Samridha Kunwar, Guillermo García-Torales, Arun Babu Kollamparambil, Diego Garcia Aguilar, Israel Martinez Castellanos, J. T. Linnemann, Kirsten Tollefson, Youngwan Son, Ignacio Taboada, Ruben Alfaro, Luis Villaseñor, Jorge Luis Flores, Ibrahim Torres, Alejandro Lara, Jorge Cotzomi, Ian Herzog, Amid Nayerhoda, Oscar Chaparro-Amaro, Jason Lee, Laura Olivera-Nieto, Michael Newbold, Ahron S. Barber, Daniel Rosa-Gonzalez, Jose Luis García-Luna, Michael DuVernois, Jason Fan, Hermes Leon Vargas, Robert Ellsworth, Michelle Hui, Umberto Cotti, Harm Schoorlemmer, Sabrina Casanova, Alison Peisker, Andrew James Smith, Rishi Babu, Kelly Malone, John Matthews, Henrike Fleischhack, David Berley, Xiaojie Wang, Oscar Martinez, Ruben Lopez-Coto, Vincent Marandon, Alberto Carramiñana, David Kieda, Yunior Pérez Araujo, Anna Lia Longinotti, Raquel Diaz Hernandez, Vardan Baghmanyan, Juan de Dios Álvarez Romero, William H. Lee, Julie McEnery, Chang Dong Rho, Humberto Ibarguen Salazar, Mehr Nisa, Ian James Watson, Dezhi Huang, Ernesto Belmont-Moreno, Jim Hinton, Sergio Hernández Cadena, Elijah Willox, Josefa Becerra Gonzalez, J. A. Goodman, James Ryan, Pedro Miranda-Romagnoli, Binita Hona, Lukas Nellen, Hao Zhou, Ramiro Torres Escobedo, Nicola Omodei, Arturo Iriarte, César Alvarez, María Catalina Espinoza Hernández, Jorge Antonio Morales Soto, Tomás Capistrán, Hawc, Anushka Udara Abeysekara, Joe Lundeen, Miguel Mostafa, Cederik León de León, Segev BenZvi, and Gerd J. Kunde
Subjects: Physics, High mass, Astrophysics
Published: 2021
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19. Modeling the non-flaring VHE emission from M87 as detected by the HAWC gamma ray observatory

Author: Dirk Lennarz, Segev BenZvi, Ian Herzog, Sara Coutiño de Leon, Francisco Salesa Greus, Joshua Wood, Andrea Albert, Hazal Goksu, Fernando Garfias, Eucario Gonzalo Pérez Pérez, Samridha Kunwar, Brian Humensky, Ramiro Torres Escobedo, Thomas Weisgarber, Israel Martinez Castellanos, Ke Fang, Arnulfo Zepeda, Nicola Omodei, Hannah Jhee, Tomás Capistrán Rojas, James Ryan, Kristi Engel, Humberto Ibarguen Salazar, Brian Fick, Lorenzo Diaz, Arturo Iriarte, Guillermo García-Torales, Arun Babu Kollamparambil, Gerd J. Kunde, Hugo Alberto Ayala Solares, Roberto Noriega-Papaqui, Josefa Becerra Gonzalez, Mehr Nisa, Laura Olivera-Nieto, Ian James Watson, Pooja Surajbali, Andrés Sandoval, Robert Ellsworth, Nissim Illich Fraija, Maria Magdalena González, Juan Carlos Arteaga Velazquez, Oscar Chaparro-Amaro, J. A. Goodman, Eduardo de la Fuente, Filiberto Hueyotl-Zahuantitla, Gus Sinnis, J. Patrick Harding, Humberto Martínez Huerta, Umberto Cotti, Jason Fan, Eduardo Moreno Barbosa, Ernesto Belmont-Moreno, Meghan Tanner, Jim Hinton, Alison Peisker, Andrew James Smith, Sabrina Casanova, Brenda Dingus, Fernando Ureña-Mena, Sergio Hernández Cadena, Colas Rivière, Ignacio Taboada, Henrike Fleischhack, Daniel Omar Avila Rojas, Jorge Cotzomi, Ruben Alfaro, Gaurang Yodh, Elijah Willox, David Kieda, Juan de Dios Álvarez Romero, María Catalina Espinoza Hernández, Jorge Antonio Morales Soto, William H. Lee, Anushka Udara Abeysekara, Julie McEnery, Ahron S. Barber, Karen S. Caballero Mora, Jason Lee, Diego Garcia Aguilar, Lukas Nellen, Rishi Babu, Kelly Malone, Hao Zhou, Jorge Luis Flores, Ibrahim Torres, Daniel Rosa-Gonzalez, Vincent Marandon, Alberto Carramiñana, Pedro Miranda-Romagnoli, Gwenael Giacinti, Jesús Martínez-Castro, Jose Luis García-Luna, Chang Dong Rho, Mora Durocher, Petra Hüntemeyer, Raquel Diaz Hernandez, Vardan Baghmanyan, Binita Hona, José Serna-Franco, Hermes Leon Vargas, Luis Villaseñor, Mateo Fernandez Alonso, Ruben Lopez-Coto, Michael Schneider, Fernando Ureña Mena, Felix Werner, Yunior Pérez Araujo, Anna Lia Longinotti, Edna Ruiz-Velasco, John Matthews, Miguel Mostafa, Cederik León de León, Jose Andres Garcia-Gonzalez, J. T. Linnemann, Oscar Martinez, Wayne Robert Springer, Amid Nayerhoda, Rhiannon Turner, Chad Brisbois, José Roberto Angeles Camacho, Juan Carlos Díaz Vélez, Armelle Jardin-Blicq, Harm Schoorlemmer, David Berley, Xiaojie Wang, Alejandro Lara, Michael DuVernois, Hawc, Vikas Joshi, Joe Lundeen, Gilgamesh Luis-Raya, Kirsten Tollefson, César Alvarez, Michael Newbold, Michelle Hui, and Dezhi Huang
Subjects: Physics, Radio galaxy, Observatory, Astrophysics::High Energy Astrophysical Phenomena, Broadband, Gamma ray, Spectral energy distribution, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Blazar, Virgo Cluster, Astrophysics::Galaxy Astrophysics, Cherenkov radiation
Abstract: M87 is a giant radio galaxy located in the Virgo Cluster, known to be a very high energy (VHE) gamma-ray source. As radio galaxies are considered the misaligned low-redshift counterparts of blazars, they are excellent laboratories for testing AGN emission models. M87 has been detected and monitored by Fermi-LAT and several atmospheric Cherenkov telescopes. Recently, the HAWC Collaboration presented marginal evidence of 4.5 year TeV gamma-ray emission from this object. The HAWC data has the potential to constrain the average VHE emission of sources of complex behavior, like M87, for which the physical origin of the VHE gamma-ray emission is still uncertain. We fitted a lepto-hadronic scenario to the broadband spectral energy distribution of M87 to model its non-flaring VHE emission using HAWC data.
Published: 2021
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20. High Energy Gamma-Ray Emission from the Coma Cluster Region: Deep Morphological and Spectral Studies

Author: Ruizhi Yang, Vardan Baghmanyan, Sabrina Casanova, Davit Zargaryan, Felix Aharonian, and Jonathan Mackey
Subjects: Physics, Spectral index, Accretion (meteorology), Astrophysics::High Energy Astrophysical Phenomena, media_common.quotation_subject, Gamma ray, Energy flux, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Universe, Hochenergie-Astrophysik Theorie - Abteilung Hinton, Coma Cluster, Cluster (physics), High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Astrophysics::Galaxy Astrophysics, Galaxy cluster, media_common
Abstract: The Coma galaxy cluster is one of the largest gravitationally-bound astrophysical structures in the local Universe, with a linear size of more than 2 Mpc and a z=0.023 distance. The relatively high intracluster density and the high-velocity accretion shocks within the cluster make it a possible source of high energy (HE) $\gamma$-ray emission. Using 12.3 years of Fermi-LAT Pass 8 data between 100 MeV and 1 TeV energies, we report the detection of HE diffuse $\gamma$-ray emission from the direction of the Coma cluster with $5.4 \sigma$ extension significance and R$_{68}$ = 0.82$^{\circ}$ extension described with a homogeneous disk model. The corresponding $\gamma$-ray spectrum extends up to $\sim50$ GeV with power-law spectral index $\Gamma = 2.23 \pm 0.11 $ and energy flux of $(3.48\pm0.68)\times10^{-12}$ erg cm$^{-2}$ s$^{-1}$. Furthermore, three point-like structures with power-law indexes of $2.44\pm0.28$, $2.56\pm0.32$, and $1.99\pm0.30$ show improvement in the fit by $\mathrm{\Delta_{AIC}}=7.2$ indicating more $\gamma$-ray sources in the region.
Published: 2021
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21. Study of the eHWC J1825-134 at the Highest Energy with HWAC

Author: James Ryan, Mora Durocher, Petra Hüntemeyer, Mateo Fernandez Alonso, Hannah Jhee, Dirk Lennarz, Maria Magdalena González, María Catalina Espinoza Hernández, Jorge Antonio Morales Soto, Michael Newbold, Tomás Capistrán, Hazal Goksu, Anushka Udara Abeysekara, Alejandro Lara, Nissim Illich Fraija, Laura Olivera-Nieto, J. Patrick Harding, Brian Humensky, Eduardo de la Fuente, Miguel Mostafa, Ahron S. Barber, Humberto Martínez Huerta, Ignacio Taboada, Hawc, Michael DuVernois, Filiberto Hueyotl-Zahuantitla, Cederik León de León, Fernando Garfias, Hermes Leon Vargas, Pedro Miranda-Romagnoli, Ruben Alfaro, Andrea Albert, Jason Fan, Jose Andres Garcia-Gonzalez, Joe Lundeen, Thomas Weisgarber, Ian Herzog, Jason Lee, Vikas Joshi, Alison Peisker, Harm Schoorlemmer, Andrew James Smith, Juan Carlos Arteaga Velazquez, Daniel Rosa-Gonzalez, Jorge Cotzomi, Henrike Fleischhack, Meghan Tanner, Josefa Becerra Gonzalez, Francisco Salesa Greus, Colas Rivière, Lukas Nellen, Pooja Surajbali, Andrés Sandoval, Segev BenZvi, Michelle Hui, Gus Sinnis, Joshua Wood, Fernando Ureña-Mena, David Berley, Eucario Gonzalo Pérez Pérez, Gaurang Yodh, J. A. Goodman, Hao Zhou, Gilgamesh Luis-Raya, Dezhi Huang, Xiaojie Wang, Guillermo García-Torales, Kristi Engel, David Kieda, Hugo Alberto Ayala Solares, Rishi Babu, César Alvarez, Arun Babu Kollamparambil, Kelly Malone, Gwenael Giacinti, Luis Villaseñor, Binita Hona, Roberto Noriega-Papaqui, Michael Schneider, Kirsten Tollefson, Felix Werner, Samridha Kunwar, Vincent Marandon, Alberto Carramiñana, Ramiro Torres Escobedo, Israel Martinez Castellanos, Raquel Diaz Hernandez, Nicola Omodei, José Serna-Franco, Gerd J. Kunde, Sara Coutiño de Leon, Oscar Chaparro-Amaro, Juan Carlos Díaz Vélez, Vardan Baghmanyan, Ernesto Belmont-Moreno, Arturo Iriarte, Armelle Jardin-Blicq, Diego Garcia Aguilar, Jim Hinton, Wayne Robert Springer, John Matthews, Sergio Hernández Cadena, Jesús Martínez-Castro, Jorge Luis Flores, Ibrahim Torres, Jose Luis García-Luna, Arnulfo Zepeda, Oscar Martinez, Rhiannon Turner, Brian Fick, Robert Ellsworth, Lorenzo Diaz, Elijah Willox, J. T. Linnemann, Eduardo Moreno Barbosa, Edna Ruiz-Velasco, Chad Brisbois, Karen S. Caballero Mora, Umberto Cotti, Sabrina Casanova, José Roberto Angeles Camacho, Amid Nayerhoda, Ke Fang, Brenda Dingus, Daniel Omar Avila Rojas, Juan de Dios Álvarez Romero, William H. Lee, Julie McEnery, Chang Dong Rho, Ruben Lopez-Coto, Yunior Pérez Araujo, Anna Lia Longinotti, Humberto Ibarguen Salazar, Mehr Nisa, and Ian James Watson
Subjects: Physics, Observatory, Astrophysics::High Energy Astrophysical Phenomena, Molecular cloud, Hadron, Cutoff, Spectral energy distribution, High Energy Physics::Experiment, Cosmic ray, Astrophysics, Effects of high altitude on humans, Astrophysics::Galaxy Astrophysics, Cherenkov radiation
Abstract: eHWC J1825-134 is one of the brightest Galactic 𝛾-ray sources above 50 TeV observed by High Altitude Water Cherenkov 𝛾-Ray Observatory (HAWC). Detailed morphological studies have revealed a new point-like source inside this region with a spectral energy distribution extending beyond 200 TeV without any cutoff. These very-high-energy 𝛾 rays emission can originate from leptonic or hadronic processes. The new point-like source is located in a region containing PWNe and a high-density giant molecular cloud [MML2017]99. If the source emission is associated with the hadronic scenario the TeV 𝛾 rays may have been produced by cosmic rays colliding with ambient gas. If this were the case, eHWC J1825-134 is an indicator of the existence of a galactic PeVatron in the region that accelerates particles up to PeV energies.
Published: 2021
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22. A GeV to TeV view of shell-type SNRs

Author: Miguel Mostafa, Cederik León de León, Brian Humensky, Gerd J. Kunde, Segev BenZvi, Mora Durocher, Petra Hüntemeyer, José Serna-Franco, Vikas Joshi, Ian Herzog, Hugo Alberto Ayala Solares, Mateo Fernandez Alonso, Hazal Goksu, Humberto Ibarguen Salazar, Roberto Noriega-Papaqui, Wayne Robert Springer, Binita Hona, Michelle Hui, Hawc, Jorge Cotzomi, Joshua A. Wood, Ahron S. Barber, Eduardo Moreno Barbosa, James Ryan, Jesús Martínez-Castro, Gilgamesh Luis-Raya, Rishi Babu, Joe Lundeen, J. T. Linnemann, Kelly Malone, Mehr Nisa, D. Berley, Dirk Lennarz, Kirsten Tollefson, Amid Nayerhoda, Vincent Marandon, Alberto Carramiñana, Alison Peisker, Samridha Kunwar, Ian James Watson, Michael Schneider, Andrew James Smith, Felix Werner, Raquel Diaz Hernandez, Vardan Baghmanyan, Oscar Chaparro-Amaro, Israel Martinez Castellanos, Gwenael Giacinti, Henrike Fleischhack, María Catalina Espinoza Hernández, David Kieda, Jorge Antonio Morales Soto, Tomás Capistrán, Pedro Miranda-Romagnoli, Juan Carlos Díaz Vélez, Laura Olivera-Nieto, Anushka Udara Abeysekara, Jose Andres Garcia-Gonzalez, Hermes Leon Vargas, Eucario Gonzalo Pérez Pérez, Fernando Garfias, Sara Coutiño de Leon, Arnulfo Zepeda, Hannah Jhee, César Alvarez, Armelle Jardin-Blicq, Brian Fick, Thomas Weisgarber, Lorenzo Diaz, Jose Luis García-Luna, Nissim Illich Fraija, Andrea Albert, Guillermo García-Torales, Arun Babu Kollamparambil, Ernesto Belmont-Moreno, Jim Hinton, Harm Schoorlemmer, Pooja Surajbali, Andrés Sandoval, Gus Sinnis, Michael Newbold, Sergio Hernández Cadena, Brenda Dingus, Juan Carlos Arteaga Velazquez, Fernando Ureña-Mena, Daniel Omar Avila Rojas, J. Patrick Harding, Karen S. Caballero Mora, Jason Fan, Meghan Tanner, Elijah Willox, Colas Rivière, Humberto Martínez Huerta, Ruben Lopez-Coto, G. B. Yodh, Dezhi Huang, Xiaojie Wang, Ke Fang, Yunior Pérez Araujo, Anna Lia Longinotti, Luis Villaseñor, Maria Magdalena González, Alejandro Lara, Ramiro Torres Escobedo, Robert Ellsworth, Juan de Dios Álvarez Romero, Nicola Omodei, Eduardo de la Fuente, Umberto Cotti, Josefa Becerra Gonzalez, Sabrina Casanova, Filiberto Hueyotl-Zahuantitla, Edna Ruiz-Velasco, Rhiannon Turner, J. A. Goodman, William H. Lee, Chad Brisbois, Michael DuVernois, Arturo Iriarte, Julie McEnery, John Matthews, Chang Dong Rho, Oscar Martinez, José Roberto Angeles Camacho, Francisco Salesa Greus, Kristi Engel, Diego Garcia Aguilar, Lukas Nellen, Hao Zhou, Jorge Luis Flores, Ibrahim Torres, Ignacio Taboada, Ruben Alfaro, Jason Lee, and Daniel Rosa-Gonzalez
Subjects: Physics, Shell (structure), Astrophysics, Type (model theory)
Published: 2021
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23. Follow-up Analysis to Geminga's contribution to the Local Positron Excess with HAWC Gamma-Ray Observatory

Author: Alison Peisker, Andrew James Smith, Henrike Fleischhack, Eucario Gonzalo Pérez Pérez, Jorge Cotzomi, Guillermo García-Torales, Arun Babu Kollamparambil, Ian Herzog, Segev BenZvi, James Ryan, Hannah Jhee, J. Patrick Harding, Rishi Babu, Kelly Malone, Humberto Martínez Huerta, Josefa Becerra Gonzalez, Andrea Albert, Mattia Di Mauro, Vincent Marandon, Alberto Carramiñana, Ramiro Torres Escobedo, Karen S. Caballero Mora, Jose Luis García-Luna, Hawc, J. A. Goodman, Nicola Omodei, Samridha Kunwar, Fernando Garfias, Brenda Dingus, Michael Newbold, Ruben Lopez-Coto, Laura Olivera-Nieto, Raquel Diaz Hernandez, Vardan Baghmanyan, Israel Martinez Castellanos, Pooja Surajbali, Andrés Sandoval, Robert Ellsworth, Juan Carlos Arteaga Velazquez, Daniel Omar Avila Rojas, Michael Schneider, Gus Sinnis, Yunior Pérez Araujo, Nissim Illich Fraija, Arturo Iriarte, Joe Lundeen, Felix Werner, Anna Lia Longinotti, Meghan Tanner, Thomas Weisgarber, Colas Rivière, Fernando Ureña-Mena, Dezhi Huang, Binita Hona, Brian Humensky, Tomás Capistrán Rojas, Umberto Cotti, Edna Ruiz-Velasco, Gaurang Yodh, Juan de Dios Álvarez Romero, Maria Magdalena González, César Alvarez, Gwenael Giacinti, Eduardo Moreno Barbosa, William H. Lee, Sabrina Casanova, Gerd J. Kunde, Julie McEnery, Jason Fan, María Catalina Espinoza Hernández, Chang Dong Rho, Jorge Antonio Morales Soto, Diego Garcia Aguilar, Vikas Joshi, Humberto Ibarguen Salazar, Eduardo de la Fuente, Anushka Udara Abeysekara, José Serna-Franco, Filiberto Hueyotl-Zahuantitla, Mehr Nisa, Ian James Watson, Jorge Luis Flores, Ibrahim Torres, Jose Andres Garcia-Gonzalez, Hugo Alberto Ayala Solares, Lukas Nellen, Hazal Goksu, Hao Zhou, Gilgamesh Luis-Raya, J. T. Linnemann, Arnulfo Zepeda, Wayne Robert Springer, Mora Durocher, Luis Villaseñor, Jesús Martínez-Castro, Roberto Noriega-Papaqui, Kirsten Tollefson, Brian Fick, Lorenzo Diaz, Petra Hüntemeyer, David Kieda, Ke Fang, Ernesto Belmont-Moreno, Mateo Fernandez Alonso, Jim Hinton, Juan Carlos Díaz Vélez, Sergio Hernández Cadena, Miguel Mostafa, Cederik León de León, Amid Nayerhoda, Armelle Jardin-Blicq, Oscar Chaparro-Amaro, Ahron S. Barber, Elijah Willox, Pedro Miranda-Romagnoli, Rhiannon Turner, Chad Brisbois, José Roberto Angeles Camacho, Francisco Salesa Greus, Joshua Wood, Sara Coutiño de Leon, Hermes Leon Vargas, Kristi Engel, John Matthews, Alejandro Lara, Dirk Lennarz, Oscar Martinez, Michael DuVernois, Ignacio Taboada, Ruben Alfaro, Michelle Hui, Harm Schoorlemmer, Jason Lee, Daniel Rosa-Gonzalez, David Berley, and Xiaojie Wang
Subjects: Physics, Positron, Observatory, Gamma ray, Astrophysics
Published: 2021
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24. Galactic Cosmic Ray increase associated to an interplanetary magnetic cloud observed by HAWC

Author: María Catalina Espinoza Hernández, Jorge Antonio Morales Soto, Tomás Capistrán, Anushka Udara Abeysekara, Andrea Albert, Harm Schoorlemmer, Dirk Lennarz, Francisco Salesa Greus, Juan Carlos Arteaga Velazquez, Brian Humensky, David Berley, Laura Olivera-Nieto, J. Patrick Harding, Humberto Martínez Huerta, Meghan Tanner, Hannah Jhee, Joshua Wood, Colas Rivière, Xiaojie Wang, Brenda Dingus, Daniel Omar Avila Rojas, Hugo Alberto Ayala Solares, Ramiro Torres Escobedo, Diego Garcia Aguilar, Mora Durocher, Rishi Babu, Roberto Noriega-Papaqui, Hawc, Petra Hüntemeyer, Kelly Malone, Edna Ruiz-Velasco, Eduardo Moreno Barbosa, Nicola Omodei, Nissim Illich Fraija, James Ryan, Kristi Engel, Vincent Marandon, Alberto Carramiñana, Arturo Iriarte, Sara Coutiño de Leon, Josefa Becerra Gonzalez, Miguel Mostafa, Oscar Chaparro-Amaro, Alison Peisker, Cederik León de León, Joe Lundeen, Jorge Luis Flores, Ibrahim Torres, Jason Fan, Raquel Diaz Hernandez, Vardan Baghmanyan, Michelle Hui, Mateo Fernandez Alonso, José Serna-Franco, Arnulfo Zepeda, Brian Fick, Lorenzo Diaz, Rhiannon Turner, Andrew James Smith, Fernando Garfias, Hermes Leon Vargas, Samridha Kunwar, J. A. Goodman, Israel Martinez Castellanos, Thomas Weisgarber, Chad Brisbois, Ke Fang, Henrike Fleischhack, J. T. Linnemann, David Kieda, Lukas Nellen, Hao Zhou, Alejandro Lara, Gerd J. Kunde, Luis Villaseñor, Ernesto Belmont-Moreno, César Alvarez, Gwenael Giacinti, Michael DuVernois, Jim Hinton, Jorge Cotzomi, Jose Andres Garcia-Gonzalez, Hazal Goksu, Ahron S. Barber, John Matthews, José Roberto Angeles Camacho, Jesús Martínez-Castro, Sergio Hernández Cadena, Eucario Gonzalo Pérez Pérez, Oscar Martinez, Segev BenZvi, Elijah Willox, Guillermo García-Torales, Arun Babu Kollamparambil, Karen S. Caballero Mora, Jose Luis García-Luna, Ignacio Taboada, Pooja Surajbali, Andrés Sandoval, Robert Ellsworth, Dezhi Huang, Ruben Alfaro, Gus Sinnis, Juan Carlos Díaz Vélez, Jason Lee, Fernando Ureña-Mena, Umberto Cotti, Daniel Rosa-Gonzalez, Armelle Jardin-Blicq, Gaurang Yodh, Sabrina Casanova, Binita Hona, Michael Schneider, Felix Werner, Ian Herzog, Wayne Robert Springer, Maria Magdalena González, Vikas Joshi, Eduardo de la Fuente, Filiberto Hueyotl-Zahuantitla, Amid Nayerhoda, Gilgamesh Luis-Raya, Kirsten Tollefson, Ruben Lopez-Coto, Michael Newbold, Yunior Pérez Araujo, Anna Lia Longinotti, Juan de Dios Álvarez Romero, William H. Lee, Julie McEnery, Chang Dong Rho, Humberto Ibarguen Salazar, Mehr Nisa, Pedro Miranda-Romagnoli, and Ian James Watson
Subjects: Physics, Range (particle radiation), Astrophysics::High Energy Astrophysical Phenomena, Physics::Space Physics, Flux, Cosmic ray, Astrophysics, Magnetic cloud, Interplanetary spaceflight, Anisotropy, Magnetic flux, Magnetic field
Abstract: We present the observation of an anomalous increment of the galactic cosmic ray (GCR) flux observed by the HAWC array during October 2016. We propose that this anisotropy of the GCR flux was caused by a magnetic flux rope (MFR) i. e., by the helicoidal magnetic field of an interplanetary coronal mass ejection observed at 1 AU at the same time. We computed the trajectory of protons with energy in the range of 10 to 60 GeV, traveling inside the helicoidal magnetic field observed in situ. The direction of these particles changes towards the axis of the MFR resulting in an anisotropy of the GCR flux along this axis. This model shows that the alignment between the MFR axis and the HAWC s asymptotic direction, combined with the high sensitivity of HAWC, allowed us to observe the effect of the passage of the MFR on the GCR flux. We present the HAWC observation associated with the passage of the MFR as well as the helio- spheric circumstances around such phenomenon.
Published: 2021
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25. Reconstruction of Nearly-Horizontal Muons in the HAWC Observatory

Author: Ernesto Belmont-Moreno, Jim Hinton, Sergio Hernández Cadena, María Catalina Espinoza Hernández, Jorge Antonio Morales Soto, Tomás Capistrán, Harm Schoorlemmer, Anushka Udara Abeysekara, Dirk Lennarz, Elijah Willox, Brian Humensky, David Berley, Hazal Goksu, Hawc, Dezhi Huang, Gerd J. Kunde, Xiaojie Wang, Robert Ellsworth, J. Patrick Harding, Humberto Martínez Huerta, Jesús Martínez-Castro, Gwenael Giacinti, Joe Lundeen, Ian Herzog, Eduardo Moreno Barbosa, Umberto Cotti, Hugo Alberto Ayala Solares, Alejandro Lara, Wayne Robert Springer, Sabrina Casanova, César Alvarez, Ramiro Torres Escobedo, Andrea Albert, Pedro Miranda-Romagnoli, Mora Durocher, Roberto Noriega-Papaqui, Michael Schneider, Felix Werner, Michael DuVernois, Nicola Omodei, Petra Hüntemeyer, Eucario Gonzalo Pérez Pérez, Juan Carlos Arteaga Velazquez, Meghan Tanner, Miguel Mostafa, Josefa Becerra Gonzalez, Cederik León de León, Arturo Iriarte, Mateo Fernandez Alonso, Hermes Leon Vargas, Michelle Hui, Ke Fang, Colas Rivière, J. A. Goodman, Ruben Lopez-Coto, Vikas Joshi, Amid Nayerhoda, Yunior Pérez Araujo, Ahron S. Barber, Anna Lia Longinotti, Segev BenZvi, Guillermo García-Torales, Arun Babu Kollamparambil, Samridha Kunwar, Israel Martinez Castellanos, Jorge Cotzomi, Sara Coutiño de Leon, Laura Olivera-Nieto, Maria Magdalena González, Gilgamesh Luis-Raya, Arnulfo Zepeda, Brian Fick, Kirsten Tollefson, Fernando Garfias, Jose Andres Garcia Gonzalez, Lorenzo Diaz, Binita Hona, David Kieda, Thomas Weisgarber, Brenda Dingus, Humberto Ibarguen Salazar, Lukas Nellen, Eduardo de la Fuente, Daniel Omar Avila Rojas, Hao Zhou, José Serna-Franco, Alison Peisker, Filiberto Hueyotl-Zahuantitla, Rishi Babu, Jose Luis García-Luna, Michael Newbold, Kelly Malone, Pooja Surajbali, Andrés Sandoval, Gus Sinnis, Diego Garcia Aguilar, Andrew James Smith, Hannah Jhee, Vincent Marandon, Alberto Carramiñana, Fernando Ureña-Mena, Raquel Diaz Hernandez, Vardan Baghmanyan, Gaurang Yodh, Mehr Nisa, Nissim Illich Fraija, Henrike Fleischhack, Edna Ruiz-Velasco, Jorge Luis Flores, Ibrahim Torres, J. T. Linnemann, James Ryan, Ian James Watson, Jason Fan, Juan Carlos Díaz Vélez, Armelle Jardin-Blicq, Juan de Dios Álvarez Romero, William H. Lee, Julie McEnery, Chang Dong Rho, Rhiannon Turner, Chad Brisbois, José Roberto Angeles Camacho, Luis Villaseñor, Karen S. Caballero Mora, Francisco Salesa Greus, Joshua Wood, Kristi Engel, John Matthews, Oscar Martinez, Ignacio Taboada, Ruben Alfaro, Jason Lee, and Daniel Rosa-Gonzalez
Subjects: Muon, Observatory, Astronomy, Geology
Published: 2021
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26. Spectral and Energy Morphology Analysis Study of HAWC J2031+415

Author: Ian Herzog, Wayne Robert Springer, Rhiannon Turner, Chad Brisbois, James Ryan, Amid Nayerhoda, José Roberto Angeles Camacho, Dirk Lennarz, Ruben Lopez-Coto, Luis Villaseñor, Robert Ellsworth, Segev BenZvi, Yunior Pérez Araujo, Anna Lia Longinotti, Brian Humensky, Andrea Albert, Umberto Cotti, Juan Carlos Arteaga Velazquez, Harm Schoorlemmer, Juan de Dios Álvarez Romero, Karen S. Caballero Mora, Sabrina Casanova, Dezhi Huang, Eucario Gonzalo Pérez Pérez, Meghan Tanner, Colas Rivière, Laura Olivera-Nieto, Samridha Kunwar, Israel Martinez Castellanos, Pooja Surajbali, Andrés Sandoval, Gus Sinnis, Hugo Alberto Ayala Solares, David Berley, Roberto Noriega-Papaqui, Miguel Mostafa, Maria Magdalena González, Guillermo García-Torales, Fernando Ureña-Mena, Cederik León de León, Arun Babu Kollamparambil, Gaurang Yodh, Brenda Dingus, Hawc, Eduardo de la Fuente, Hermes Leon Vargas, Binita Hona, Xiaojie Wang, Ke Fang, Filiberto Hueyotl-Zahuantitla, Jesús Martínez-Castro, Daniel Omar Avila Rojas, Mora Durocher, Petra Hüntemeyer, Lukas Nellen, Michelle Hui, Hao Zhou, Oscar Chaparro-Amaro, Mateo Fernandez Alonso, Ernesto Belmont-Moreno, Jim Hinton, Sergio Hernández Cadena, J. Patrick Harding, Humberto Martínez Huerta, Alison Peisker, Andrew James Smith, Joe Lundeen, Fernando Garfias, Ramiro Torres Escobedo, Elijah Willox, Sara Coutiño de Leon, Henrike Fleischhack, Nicola Omodei, Thomas Weisgarber, Gwenael Giacinti, Arturo Iriarte, Jorge Cotzomi, Eduardo Moreno Barbosa, Josefa Becerra Gonzalez, José Serna-Franco, J. A. Goodman, Edna Ruiz-Velasco, Juan Carlos Díaz Vélez, Gerd J. Kunde, Armelle Jardin-Blicq, Jose Luis García-Luna, Ahron S. Barber, J. T. Linnemann, Alejandro Lara, Rishi Babu, Kelly Malone, Hazal Goksu, Michael DuVernois, Vincent Marandon, Alberto Carramiñana, Jose Andres Garcia-Gonzalez, David Kieda, Michael Newbold, Hannah Jhee, Nissim Illich Fraija, Jason Fan, Vikas Joshi, Gilgamesh Luis-Raya, Diego Garcia Aguilar, Jorge Luis Flores, Ibrahim Torres, Kirsten Tollefson, Raquel Diaz Hernandez, Vardan Baghmanyan, John Matthews, Oscar Martinez, Francisco Salesa Greus, Joshua Wood, Kristi Engel, Ignacio Taboada, Ruben Alfaro, Jason Lee, Daniel Rosa-Gonzalez, Pedro Miranda-Romagnoli, María Catalina Espinoza Hernández, Jorge Antonio Morales Soto, Tomás Capistrán, Anushka Udara Abeysekara, César Alvarez, Michael Schneider, Felix Werner, Arnulfo Zepeda, Brian Fick, Lorenzo Diaz, William H. Lee, Julie McEnery, Chang Dong Rho, Humberto Ibarguen Salazar, Mehr Nisa, and Ian James Watson
Subjects: Physics, Range (particle radiation), Star cluster, OB star, Observatory, Astrophysics::High Energy Astrophysical Phenomena, Cluster (physics), Cygnus OB2, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Pulsar wind nebula, Astrophysics::Galaxy Astrophysics, Cherenkov radiation
Abstract: The Cygnus Cocoon region is a complex region containing an OB star cluster that is prominent in the TeV energy range. Located in this region is 3HWC J2031+415, a significant TeV gamma-ray source whose emission is possibly associated with 2 components, the Cygnus OB2 star cluster and a pulsar wind nebula (PWN). In this work, several modelling methods are presented to best describe the emission. These models disentangle emission believed to be from the Cocoon and isolate the component emitted by the probable PWN. I will present several spectral models to describe the emission of the probable PWN using the latest data set from the High-Altitude Water Cherenkov (HAWC) observatory. Furthermore, I will present an energy morphology study of the PWN component of 3HWC J2031+415 in distinct energy bands.
Published: 2021
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27. A search for spectral hardening in HAWC sources above 56 TeV

Author: Mora Durocher, Petra Hüntemeyer, Dirk Lennarz, Mateo Fernandez Alonso, Hugo Alberto Ayala Solares, Wayne Robert Springer, Roberto Noriega-Papaqui, Pooja Surajbali, Andrés Sandoval, Ernesto Belmont-Moreno, Gus Sinnis, Jim Hinton, Fernando Ureña-Mena, Sergio Hernández Cadena, Gaurang Yodh, Eucario Gonzalo Pérez Pérez, Laura Olivera-Nieto, Jose Andres Garcia-Gonzalez, Oscar Chaparro-Amaro, Brian Humensky, Elijah Willox, Jesús Martínez-Castro, Michael Newbold, Guillermo García-Torales, Arun Babu Kollamparambil, Amid Nayerhoda, Pedro Miranda-Romagnoli, Humberto Ibarguen Salazar, Hawc, James Ryan, Juan Carlos Díaz Vélez, Fernando Garfias, Armelle Jardin-Blicq, Andrea Albert, Thomas Weisgarber, Mehr Nisa, Joe Lundeen, Josefa Becerra Gonzalez, Ian James Watson, Diego Garcia Aguilar, Juan Carlos Arteaga Velazquez, Ramiro Torres Escobedo, Robert Ellsworth, Vikas Joshi, Harm Schoorlemmer, Michelle Hui, Miguel Mostafa, J. A. Goodman, Meghan Tanner, Jorge Luis Flores, Ibrahim Torres, Cederik León de León, Nicola Omodei, Colas Rivière, Alison Peisker, Andrew James Smith, Rhiannon Turner, David Kieda, César Alvarez, Chad Brisbois, Arturo Iriarte, Samridha Kunwar, David Berley, Umberto Cotti, Dezhi Huang, Henrike Fleischhack, Hazal Goksu, Gilgamesh Luis-Raya, Kirsten Tollefson, Israel Martinez Castellanos, Xiaojie Wang, Ahron S. Barber, Rishi Babu, Kelly Malone, Vincent Marandon, Alberto Carramiñana, Sabrina Casanova, José Roberto Angeles Camacho, Gerd J. Kunde, Karen S. Caballero Mora, Juan de Dios Álvarez Romero, Michael Schneider, Felix Werner, Binita Hona, Raquel Diaz Hernandez, Vardan Baghmanyan, William H. Lee, Hannah Jhee, Julie McEnery, Sara Coutiño de Leon, Chang Dong Rho, Edna Ruiz-Velasco, Nissim Illich Fraija, Segev BenZvi, Ruben Lopez-Coto, Luis Villaseñor, Jason Fan, Yunior Pérez Araujo, Arnulfo Zepeda, Ke Fang, Anna Lia Longinotti, Lukas Nellen, Ignacio Taboada, Brian Fick, Lorenzo Diaz, Alejandro Lara, J. Patrick Harding, Hao Zhou, Michael DuVernois, Ruben Alfaro, Humberto Martínez Huerta, Jorge Cotzomi, Jason Lee, Daniel Rosa-Gonzalez, Jose Luis García-Luna, John Matthews, Oscar Martinez, Francisco Salesa Greus, Joshua Wood, Kristi Engel, Eduardo Moreno Barbosa, María Catalina Espinoza Hernández, Jorge Antonio Morales Soto, Tomás Capistrán, Anushka Udara Abeysekara, Maria Magdalena González, Eduardo de la Fuente, Filiberto Hueyotl-Zahuantitla, Ian Herzog, Hermes Leon Vargas, Brenda Dingus, Daniel Omar Avila Rojas, José Serna-Franco, J. T. Linnemann, and Gwenael Giacinti
Subjects: Physics, Spectral index, Observatory, Astrophysics::High Energy Astrophysical Phenomena, Hadron, Hardening (metallurgy), Gamma ray, Astrophysics, Cherenkov radiation
Abstract: The High Altitude Water Cherenkov (HAWC) Observatory is a wide-field-of-view gamma-ray observatory that is optimized to detect gamma rays between ~300 GeV and several hundred TeV. The HAWC Collaboration recently released their third source catalog (3HWC), which contains 65 sources. One of these sources, the ultra-high-energy gamma-ray source 3HWC J1908+063, may exhibit a hardening of the spectral index at the highest energies (above 56 TeV). At least two populations of particles are needed to satisfactorily explain the highest energy emission. This second component could be leptonic or hadronic in origin. If it is hadronic in origin, it would imply the presence of protons with energies up to $\sim$1 PeV near the source. We have searched other 3HWC sources for the presence of this spectral hardening feature. If observed, this would imply that the sources could make good PeVatron candidates.
Published: 2021
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28. Particle Acceleration in the Cygnus Superbubble

Author: Sara Coutiño de Leon, Hazal Goksu, Francisco Salesa Greus, Gwenael Giacinti, Joshua Wood, Eucario Gonzalo Pérez Pérez, Rishi Babu, Samridha Kunwar, Vikas Joshi, Kelly Malone, Israel Martinez Castellanos, Kristi Engel, Binita Hona, Michael Newbold, Vincent Marandon, Ian Herzog, Segev BenZvi, Guillermo García-Torales, Arun Babu Kollamparambil, Alberto Carramiñana, Ernesto Belmont-Moreno, Gilgamesh Luis-Raya, Kirsten Tollefson, Rhiannon Turner, Harm Schoorlemmer, Chad Brisbois, Robert Ellsworth, Eduardo Moreno Barbosa, Jim Hinton, Michelle Hui, Raquel Diaz Hernandez, Vardan Baghmanyan, Brenda Dingus, Wayne Robert Springer, James Ryan, Fernando Garfias, Daniel Omar Avila Rojas, Sergio Hernández Cadena, José Roberto Angeles Camacho, J. Patrick Harding, John Matthews, Humberto Martínez Huerta, David Berley, Arnulfo Zepeda, Umberto Cotti, Brian Fick, José Serna-Franco, Thomas Weisgarber, Oscar Martinez, Jesús Martínez-Castro, Amid Nayerhoda, Lorenzo Diaz, Xiaojie Wang, Alison Peisker, María Catalina Espinoza Hernández, Jorge Antonio Morales Soto, Sabrina Casanova, Tomás Capistrán, Elijah Willox, Andrew James Smith, Diego Garcia Aguilar, Gerd J. Kunde, J. T. Linnemann, Andrea Albert, Henrike Fleischhack, Dezhi Huang, Jorge Luis Flores, Ibrahim Torres, Ignacio Taboada, Alejandro Lara, Dirk Lennarz, Ruben Alfaro, Juan Carlos Arteaga Velazquez, Anushka Udara Abeysekara, Jorge Cotzomi, Meghan Tanner, Hermes Leon Vargas, Colas Rivière, Jason Lee, Laura Olivera-Nieto, Michael DuVernois, Edna Ruiz-Velasco, Daniel Rosa-Gonzalez, Hugo Alberto Ayala Solares, Michael Schneider, Juan Carlos Díaz Vélez, Armelle Jardin-Blicq, Miguel Mostafa, Felix Werner, Cederik León de León, Roberto Noriega-Papaqui, Jose Luis García-Luna, Ramiro Torres Escobedo, Nicola Omodei, Arturo Iriarte, Ke Fang, César Alvarez, Pedro Miranda-Romagnoli, Oscar Chaparro-Amaro, Josefa Becerra Gonzalez, J. A. Goodman, Lukas Nellen, Maria Magdalena González, Hao Zhou, Eduardo de la Fuente, Hawc, Filiberto Hueyotl-Zahuantitla, Ahron S. Barber, Joe Lundeen, Jose Andres Garcia-Gonzalez, Pooja Surajbali, Andrés Sandoval, Gus Sinnis, Hannah Jhee, Fernando Ureña-Mena, Nissim Illich Fraija, Brian Humensky, Gaurang Yodh, Jason Fan, Mora Durocher, Petra Hüntemeyer, Mateo Fernandez Alonso, David Kieda, Luis Villaseñor, Karen S. Caballero Mora, Juan de Dios Álvarez Romero, William H. Lee, Julie McEnery, Chang Dong Rho, Humberto Ibarguen Salazar, Mehr Nisa, Ian James Watson, Ruben Lopez-Coto, Yunior Pérez Araujo, and Anna Lia Longinotti
Subjects: Particle acceleration, Physics, Superbubble, Astrophysics
Published: 2021
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29. Study of the morphology of the region surrounding eHWC J1850+001

Author: Fernando Garfias, Thomas Weisgarber, Alison Peisker, Andrew James Smith, Alejandro Lara, Rhiannon Turner, Henrike Fleischhack, Chad Brisbois, Michael DuVernois, Wayne Robert Springer, José Roberto Angeles Camacho, Amid Nayerhoda, Pedro Miranda-Romagnoli, Hazal Goksu, Hannah Jhee, Samridha Kunwar, Israel Martinez Castellanos, Dirk Lennarz, Humberto Ibarguen Salazar, Ramiro Torres Escobedo, Nicola Omodei, Rishi Babu, Kelly Malone, Harm Schoorlemmer, Arturo Iriarte, Hugo Alberto Ayala Solares, Jorge Cotzomi, Ian Herzog, Vincent Marandon, Alberto Carramiñana, Pooja Surajbali, Andrés Sandoval, Nissim Illich Fraija, Eucario Gonzalo Pérez Pérez, Mehr Nisa, Juan Carlos Díaz Vélez, Roberto Noriega-Papaqui, Ian James Watson, Gus Sinnis, Raquel Diaz Hernandez, Vardan Baghmanyan, Armelle Jardin-Blicq, Michael Newbold, Hawc, Gwenael Giacinti, Fernando Ureña-Mena, Gaurang Yodh, Edna Ruiz-Velasco, Andrea Albert, Guillermo García-Torales, Arun Babu Kollamparambil, John Matthews, David Berley, Oscar Chaparro-Amaro, Joe Lundeen, Jason Fan, Jose Luis García-Luna, Mora Durocher, Xiaojie Wang, Oscar Martinez, Petra Hüntemeyer, Juan Carlos Arteaga Velazquez, Mateo Fernandez Alonso, Diego Garcia Aguilar, Michelle Hui, J. Patrick Harding, Humberto Martínez Huerta, Meghan Tanner, María Catalina Espinoza Hernández, Maria Magdalena González, Colas Rivière, Ke Fang, Jorge Antonio Morales Soto, Tomás Capistrán, Ruben Lopez-Coto, Jorge Luis Flores, Ibrahim Torres, Francisco Salesa Greus, Joshua Wood, Hermes Leon Vargas, Sara Coutiño de Leon, Ahron S. Barber, Yunior Pérez Araujo, Anna Lia Longinotti, César Alvarez, Lukas Nellen, Hao Zhou, Eduardo de la Fuente, Anushka Udara Abeysekara, David Kieda, Brenda Dingus, Daniel Omar Avila Rojas, José Serna-Franco, Michael Schneider, Binita Hona, Filiberto Hueyotl-Zahuantitla, Felix Werner, Robert Ellsworth, Kristi Engel, Vikas Joshi, Umberto Cotti, Juan de Dios Álvarez Romero, Sabrina Casanova, Jose Andres Garcia-Gonzalez, Jesús Martínez-Castro, James Ryan, William H. Lee, Julie McEnery, Ignacio Taboada, Chang Dong Rho, J. T. Linnemann, Gilgamesh Luis-Raya, Arnulfo Zepeda, Laura Olivera-Nieto, Kirsten Tollefson, Ruben Alfaro, Brian Fick, Lorenzo Diaz, Jason Lee, Daniel Rosa-Gonzalez, Eduardo Moreno Barbosa, Luis Villaseñor, Brian Humensky, Dezhi Huang, Karen S. Caballero Mora, Josefa Becerra Gonzalez, J. A. Goodman, Ernesto Belmont-Moreno, Jim Hinton, Sergio Hernández Cadena, Elijah Willox, Segev BenZvi, Miguel Mostafa, Cederik León de León, and Gerd J. Kunde
Subjects: Morphology (linguistics), Materials science, Biophysics
Published: 2021
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30. Characterizing gamma-ray sources with HAL (HAWC Accelerated likelihood) and 3ML

Author: Hannah Jhee, Josefa Becerra Gonzalez, Nissim Illich Fraija, J. A. Goodman, Arnulfo Zepeda, Brian Fick, Lorenzo Diaz, José Serna-Franco, Jason Fan, Eucario Gonzalo Pérez Pérez, Diego Garcia Aguilar, Edna Ruiz-Velasco, Jorge Luis Flores, Ibrahim Torres, J. T. Linnemann, Guillermo García-Torales, Arun Babu Kollamparambil, Eduardo Moreno Barbosa, Wayne Robert Springer, Ernesto Belmont-Moreno, Hazal Goksu, Juan Carlos Díaz Vélez, Binita Hona, David Kieda, Jim Hinton, María Catalina Espinoza Hernández, Jorge Antonio Morales Soto, Tomás Capistrán, Armelle Jardin-Blicq, Jorge Cotzomi, Harm Schoorlemmer, Sergio Hernández Cadena, Brian Humensky, Rishi Babu, Anushka Udara Abeysekara, Kelly Malone, Amid Nayerhoda, Jesús Martínez-Castro, Fernando Garfias, James Ryan, Gwenael Giacinti, Vincent Marandon, Alberto Carramiñana, Samridha Kunwar, Jose Luis García-Luna, Elijah Willox, Alison Peisker, Thomas Weisgarber, Michael Schneider, Raquel Diaz Hernandez, Andrew James Smith, Israel Martinez Castellanos, Ruben Lopez-Coto, Vardan Baghmanyan, David Berley, Felix Werner, Lukas Nellen, Dezhi Huang, Robert Ellsworth, Henrike Fleischhack, Yunior Pérez Araujo, Anna Lia Longinotti, Hao Zhou, Xiaojie Wang, Hermes Leon Vargas, Michael Newbold, Umberto Cotti, Rhiannon Turner, Hugo Alberto Ayala Solares, Sabrina Casanova, Chad Brisbois, J. Patrick Harding, Roberto Noriega-Papaqui, Humberto Martínez Huerta, José Roberto Angeles Camacho, Vikas Joshi, Juan de Dios Álvarez Romero, Alejandro Lara, Ramiro Torres Escobedo, Brenda Dingus, Jose Andres Garcia-Gonzalez, Oscar Chaparro-Amaro, Nicola Omodei, Andrea Albert, Ahron S. Barber, Ke Fang, Karen S. Caballero Mora, William H. Lee, Daniel Omar Avila Rojas, Arturo Iriarte, Juan Carlos Arteaga Velazquez, Laura Olivera-Nieto, Julie McEnery, Michael DuVernois, Chang Dong Rho, Meghan Tanner, Gilgamesh Luis-Raya, Colas Rivière, Kirsten Tollefson, Humberto Ibarguen Salazar, Mehr Nisa, Ian James Watson, Sara Coutiño de Leon, Luis Villaseñor, Pooja Surajbali, Andrés Sandoval, Gus Sinnis, Fernando Ureña-Mena, Gaurang Yodh, Mora Durocher, Petra Hüntemeyer, Mateo Fernandez Alonso, Ignacio Taboada, Ruben Alfaro, Jason Lee, Daniel Rosa-Gonzalez, Francisco Salesa Greus, Joshua Wood, Kristi Engel, John Matthews, Pedro Miranda-Romagnoli, Oscar Martinez, Dirk Lennarz, Michelle Hui, Gerd J. Kunde, Maria Magdalena González, Segev BenZvi, Eduardo de la Fuente, Filiberto Hueyotl-Zahuantitla, Ian Herzog, Miguel Mostafa, Cederik León de León, César Alvarez, Hawc, and Joe Lundeen
Subjects: Physics, Gamma ray, Astrophysics
Published: 2021
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31. Search for TeV decaying dark matter from the Virgo cluster of galaxies

Author: Wayne Robert Springer, Mora Durocher, Petra Hüntemeyer, Mateo Fernandez Alonso, Ernesto Belmont-Moreno, Jim Hinton, Amid Nayerhoda, Laura Olivera-Nieto, Hugo Alberto Ayala Solares, Sergio Hernández Cadena, Elijah Willox, Michelle Hui, Francisco Salesa Greus, Joshua Wood, Michael Schneider, Pedro Miranda-Romagnoli, Felix Werner, Brian Humensky, Roberto Noriega-Papaqui, Hawc, Hermes Leon Vargas, José Serna-Franco, Edna Ruiz-Velasco, Kristi Engel, Alison Peisker, Michael Newbold, Hannah Jhee, Josefa Becerra Gonzalez, Joe Lundeen, Lukas Nellen, María Catalina Espinoza Hernández, Jorge Antonio Morales Soto, Oscar Chaparro-Amaro, Juan de Dios Álvarez Romero, Dirk Lennarz, Tomás Capistrán, Andrew James Smith, J. T. Linnemann, Anushka Udara Abeysekara, J. A. Goodman, Hao Zhou, Pooja Surajbali, Andrés Sandoval, Binita Hona, Sara Coutiño de Leon, Henrike Fleischhack, Nissim Illich Fraija, Vikas Joshi, William H. Lee, Dezhi Huang, Ignacio Taboada, Julie McEnery, Ian Herzog, Gus Sinnis, Chang Dong Rho, César Alvarez, Ruben Alfaro, Rhiannon Turner, Chad Brisbois, Diego Garcia Aguilar, Fernando Garfias, Fernando Ureña-Mena, Gaurang Yodh, Eduardo Moreno Barbosa, Ramiro Torres Escobedo, Jason Fan, Gwenael Giacinti, Gilgamesh Luis-Raya, Thomas Weisgarber, Nicola Omodei, James Ryan, Humberto Ibarguen Salazar, Jason Lee, Jorge Luis Flores, Kirsten Tollefson, José Roberto Angeles Camacho, Ibrahim Torres, Eucario Gonzalo Pérez Pérez, Daniel Rosa-Gonzalez, Samridha Kunwar, Israel Martinez Castellanos, Arnulfo Zepeda, Arturo Iriarte, Alejandro Lara, Brian Fick, Jose Andres Garcia-Gonzalez, Lorenzo Diaz, Mehr Nisa, Karen S. Caballero Mora, Ian James Watson, Michael DuVernois, David Kieda, Guillermo García-Torales, Arun Babu Kollamparambil, J. Patrick Harding, Humberto Martínez Huerta, Maria Magdalena González, John Matthews, Gerd J. Kunde, Brenda Dingus, Harm Schoorlemmer, Daniel Omar Avila Rojas, Oscar Martinez, Eduardo de la Fuente, M. U. Nisa, Luis Villaseñor, David Berley, Hazal Goksu, Miguel Mostafa, Filiberto Hueyotl-Zahuantitla, Xiaojie Wang, Cederik León de León, Segev BenZvi, Juan Carlos Díaz Vélez, Armelle Jardin-Blicq, Ruben Lopez-Coto, Yunior Pérez Araujo, Anna Lia Longinotti, Ahron S. Barber, Rishi Babu, Kelly Malone, Vincent Marandon, Alberto Carramiñana, Raquel Diaz Hernandez, Vardan Baghmanyan, Andrea Albert, Ke Fang, Juan Carlos Arteaga Velazquez, Meghan Tanner, Robert Ellsworth, Colas Rivière, Umberto Cotti, Sabrina Casanova, Jorge Cotzomi, Jose Luis García-Luna, and Jesús Martínez-Castro
Subjects: Physics, Dark matter, Astrophysics, Virgo Cluster, Galaxy
Published: 2021
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32. The Ultra-High-Energy Source MGRO J1908+06

Author: Ian Herzog, Laura Olivera-Nieto, César Alvarez, María Catalina Espinoza Hernández, Jorge Antonio Morales Soto, Tomás Capistrán, Anushka Udara Abeysekara, Dezhi Huang, Robert Ellsworth, J. Patrick Harding, Humberto Martínez Huerta, James Ryan, Brian Humensky, Lukas Nellen, Eduardo Moreno Barbosa, Umberto Cotti, Hao Zhou, Sara Coutiño de Leon, Segev BenZvi, Sabrina Casanova, Jesús Martínez-Castro, Jose Andres Garcia-Gonzalez, Fernando Garfias, Michelle Hui, Hawc, Ramiro Torres Escobedo, Wayne Robert Springer, Nicola Omodei, Jorge Cotzomi, Andrea Albert, Thomas Weisgarber, Joe Lundeen, Arturo Iriarte, Harm Schoorlemmer, Josefa Becerra Gonzalez, Gwenael Giacinti, Karen S. Caballero Mora, Juan Carlos Arteaga Velazquez, Edna Ruiz-Velasco, Meghan Tanner, Alison Peisker, David Kieda, Dirk Lennarz, Colas Rivière, Andrew James Smith, J. A. Goodman, Mora Durocher, Petra Hüntemeyer, Henrike Fleischhack, Ernesto Belmont-Moreno, Amid Nayerhoda, David Berley, Luis Villaseñor, José Serna-Franco, Mateo Fernandez Alonso, Jim Hinton, Hugo Alberto Ayala Solares, Sergio Hernández Cadena, Hannah Jhee, Roberto Noriega-Papaqui, Juan Carlos Díaz Vélez, Jose Luis García-Luna, Maria Magdalena González, Armelle Jardin-Blicq, Elijah Willox, Miguel Mostafa, Pedro Miranda-Romagnoli, Binita Hona, Ahron S. Barber, Cederik León de León, Xiaojie Wang, Nissim Illich Fraija, Eucario Gonzalo Pérez Pérez, Oscar Chaparro-Amaro, Samridha Kunwar, Eduardo de la Fuente, Israel Martinez Castellanos, Filiberto Hueyotl-Zahuantitla, J. T. Linnemann, Jason Fan, Rhiannon Turner, Guillermo García-Torales, Arun Babu Kollamparambil, Rishi Babu, Ke Fang, Pooja Surajbali, Andrés Sandoval, Chad Brisbois, Gus Sinnis, Fernando Ureña-Mena, Gaurang Yodh, José Roberto Angeles Camacho, Brenda Dingus, Gerd J. Kunde, Daniel Omar Avila Rojas, Kelly Malone, Alejandro Lara, Vincent Marandon, Alberto Carramiñana, Michael DuVernois, Raquel Diaz Hernandez, Vardan Baghmanyan, Juan de Dios Álvarez Romero, William H. Lee, Julie McEnery, Chang Dong Rho, Ruben Lopez-Coto, Francisco Salesa Greus, Arnulfo Zepeda, Brian Fick, Lorenzo Diaz, Joshua Wood, Diego Garcia Aguilar, Yunior Pérez Araujo, Anna Lia Longinotti, Jorge Luis Flores, Ibrahim Torres, Kristi Engel, Michael Newbold, Michael Schneider, Felix Werner, Ignacio Taboada, Vikas Joshi, Ruben Alfaro, Jason Lee, Daniel Rosa-Gonzalez, Humberto Ibarguen Salazar, Gilgamesh Luis-Raya, Kirsten Tollefson, John Matthews, Oscar Martinez, Mehr Nisa, Ian James Watson, Hazal Goksu, and Hermes Leon Vargas
Subjects: Physics, High energy, education.field_of_study, Spectral index, Observatory, Astrophysics::High Energy Astrophysical Phenomena, Population, Hadron, Spectral energy distribution, Astrophysics, education, Cherenkov radiation
Abstract: The TeV gamma-ray source MGRO J1908+06 is one of the highest-energy sources known, with observed emission by the High Altitude Water Cherenkov (HAWC) Observatory extending well past 100 TeV. The source exhibits both energy-dependent morphology and a spatially-dependent spectral index. The emission is likely to be dominantly leptonic, and associated with the radio-quiet PSR J1907+0602. However, one-population models do not describe the data well; a second particle population is needed to explain the shape of the spectral energy distribution at the highest energies. This component can be well-described by either leptonic or hadronic hypotheses. We discuss this feature and implications for detection by multi-wavelength and multi-messenger experiments.
Published: 2021
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33. The young massive stellar cluster Westerlund 1 in gamma rays as seen with H.E.S.S

Author: Lars Mohrmann, Hassan Abdalla, Felix Aharonian, Faical Ait-Benkhali, Oguzhan Anguener, Cornelia Arcaro, Celine Armand, Tom Armstrong, Halim Ashkar, Michael Backes, Vardan Baghmanyan, Victor Barbosa Martins, Anna Barnacka, Monica Barnard, Rowan William Batzofin, Yvonne Becherini, David Berge, Konrad Bernloehr, Baiyang Bi, Markus Böttcher, Catherine Boisson, Julien Bolmont, Mathieu Bony (de), Mischa Breuhaus, Robert Brose, Francois Brun, Tomasz Bulik, Thomas Bylund, Floriane Cangemi, Sami Caroff, Sabrina Casanova, Jaqueline Catalano, Pauline Chambery, Tej Bahadur Chand, Andrew Chen, Garret Cotter, Malgorzata Curlo, Hannah Dalgleish, Jean Damascene Mbarubucyeye, Isak Delberth Davids, James Davies, Justine Devin, Arache Djannati-Ataï, Anton Dmytriev, Axel Donath, Victor Doroshenko, Lente Dreyer, Louis Du Plessis, Connor Duffy, Kathrin Egberts, Sabrina Einecke, Jean-Pierre ERNENWEIN, Steven Fegan, Kirsty Feijen, Armand Fiasson, Gaëtan Fichet de Clairfontaine, Gerard Fontaine, Lott Frans, Matthias Fuessling, Stefan Funk, Stefano Gabici, Yves Gallant, Gianluca Giavitto, Luca Giunti, Dorit Glawion, Jean-Francois Glicenstein, Marie-Hélène Grondin, Sumari Hattingh, Maria Haupt, German HERMANN, Jim Hinton, Werner Hofmann, Clemens Hoischen, Tim Holch, Markus Holler, Dieter Horns, Zhi-Qiu Huang, David Huber, Mario Hörbe, Marek Jamrozy, Felix Jankowsky, Vikas Joshi, Ira JUNG, Eli Kasai, Krzysztof Katarzynski, Ulì Katz, Dmitry Khangulyan, Bruno Khelifi, Stefan Klepser, Wlodek Kluzniak, Nukri Komin, Ruslan Konno, Karl Kosack, Dmitriy Kostunin, Michael Kreter, Gašper Kukec Mezek, Anu Kundu, Giovanni Lamanna, Sebastien Le Stum, Anne Lemiere, Marianne Lemoine-Goumard, Jean-Philippe Lenain, Fabian Leuschner, Christelle Levy, Thomas Lohse, Anna Luashvili, Iryna Lypova, Jonathan Mackey, Jhilik Majumdar, Denys Malyshev, Dmitry Malyshev, Vincent Marandon, Paolo Marchegiani, Alexandre Marcowith, Arnaud Mares, Guillem Martí-Devesa, Ramin Marx, Gilles Maurin, Pieter Meintjes, Manuel Meyer, Alison Mitchell, Rafal Moderski, Alessandro Montanari, Chris Moore, Paul Morris, Emmanuel Moulin, Jacques Muller, Thomas Murach, Kaori Nakashima, Mathieu Naurois (de), Amid Nayerhoda, Hambeleleni Davids, Jacek Niemiec, Angel Noel, Paul O'Brien, Laenita Lorraine Oberholzer, Stefan Ohm, Laura Olivera-Nieto, Emma Ona-Wilhelmi (de), Michal Ostrowski, Sebastian Panny, Michael Panter, Dan Parsons, Giada Peron, Santiago Pita, Vincent Poireau, Dmitry A Prokhorov, Heike Prokoph, Gerd PUEHLHOFER, Michael Punch, Andreas Quirrenbach, Romed Rauth, Patrick Reichherzer, Anita Reimer, Olaf Reimer, Quentin Remy, Matthieu Renaud, Brian Reville, Frank Rieger, Carlo Romoli, Gavin P Rowell, Bronislaw Rudak, Hector Rueda Ricarte, Edna Ruiz Velasco, Vardan Sahakian, Simon Sailer, Heiko Salzmann, David Sanchez, Andrea Santangelo, Manami Sasaki, Johannes Schaefer, Hester Schutte, Ullrich Schwanke, Fabian Schüssler, Mohanraj Senniappan, Albert Seyffert, Jimmy N.S. Shapopi, Kleopas Shiningayamwe, Rachel Simoni, Atreyee Sinha, Helene Sol, Hugh Spackman, Andreas Specovius, Samuel Timothy Spencer, Marion Spir-Jacob, Lukasz Stawarz, Riaan Steenkamp, Christian Stegmann, Simon Steinmassl, Constantin Steppa, Lei Sun, Tadayuki Takahashi, Takaaki Tanaka, Thomas Tavernier, Andrew Taylor, Regis Terrier, Hannes Thiersen, Charles Thorpe-Morgan, Martin Tluczykont, Lenka Tomankova, Michelle Tsirou, Naomi Tsuji, Richard Tuffs, Yasunobu Uchiyama, Johann van der Walt, Christopher van Eldik, Carlo van Rensburg, Brian van Soelen, George Vasileiadis, Johannes Veh, Christo Venter, Pascal Vincent, Jacco Vink, Heinrich J. Völk, Stefan Wagner, Jason John Watson, Felix Werner, Richard White, Alicja Wierzcholska, Yu Wun Wong, Hend Mahmoud Yassin, Anke Yusafzai, Michael Zacharias, Roberta Zanin, Davit Zargaryan, Andrzej Zdziarski, Andreas Zech, Sylvia Zhu, Andreas Zmija, Samuel Zouari, Natalia Żywucka, Naurois , Mathieu, Ona-Wilhelmi , Emma, and Bony , Mathieu
Subjects: Physics, Milky Way, Astrophysics::High Energy Astrophysical Phenomena, Hadron, Gamma ray, Cosmic ray, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Likelihood analysis, Energy spectrum, Cluster (physics), ddc:530, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics::Galaxy Astrophysics
Abstract: 37th International Cosmic Ray Conference, ICRC 2021, Berlin, online, Germany, 12 Jul 2021 - 23 Jul 2021; Proceedings of Science / International School for Advanced Studies (ICRC2021), 789 (2021). doi:10.22323/1.395.0789, Massive stellar clusters have recently been hypothesised as candidates for the acceleration of hadronic cosmic rays up to PeV energies. Previously, the H.E.S.S. Collaboration has reported about very extended $\gamma$-ray emission around Westerlund 1, a massive young stellar cluster in the Milky Way. In this contribution we present an updated analysis that employs a new analysis technique and is based on a much larger data set, allowing us to constrain better the morphology and the energy spectrum of the emission. The analysis technique used is a three-dimensional likelihood analysis, which is especially well suited for largely extended sources. The origin of the $\gamma$-ray emission will be discussed in light of multi-wavelength observations., Published by SISSA, Trieste
Published: 2021
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34. Use of Machine Learning for gamma/hadron separation with HAWC

Author: Tomás Capistrán, Kwok Lung Fan, James T. Linnemann, Ibrahim Torres, Pablo Miguel Saz Parkinson, Philip L. H. Yu, Anushka Udara Abeysekara, Andrea Albert, Ruben Alfaro, César Alvarez, Juan de Dios Álvarez Romero, José Roberto Angeles Camacho, Juan Carlos Arteaga Velazquez, Arun Babu Kollamparambil, Daniel Omar Avila Rojas, Hugo Alberto Ayala Solares, Rishi Babu, Vardan Baghmanyan, Ahron S. Barber, Josefa Becerra Gonzalez, Ernesto Belmont-Moreno, Segev BenZvi, David Berley, Chad Brisbois, Karen S. Caballero Mora, Alberto Carramiñana, Sabrina Casanova, Oscar Chaparro-Amaro, Umberto Cotti, Jorge Cotzomi, Sara Coutiño de León, Eduardo de la Fuente, Cederik León de León, Lorenzo Diaz, Raquel Diaz Hernandez, Juan Carlos Díaz Vélez, Brenda Dingus, Mora Durocher, Michael DuVernois, Robert Ellsworth, Kristi Engel, María Catalina Espinoza Hernández, Ke Fang, Mateo Fernandez Alonso, Brian Fick, Henrike Fleischhack, Jorge Luis Flores, Nissim Illich Fraija, Diego Garcia Aguilar, Jose Andres Garcia-Gonzalez, Jose Luis García-Luna, Guillermo García-Torales, Fernando Garfias, Gwenael Giacinti, Hazal Goksu, Maria Magdalena González, Jordan A. Goodman, J. Patrick Harding, Sergio Hernández Cadena, Ian Herzog, Jim Hinton, Binita Hona, Dezhi Huang, Filiberto Hueyotl-Zahuantitla, Michelle Hui, Brian Humensky, Petra Hüntemeyer, Arturo Iriarte, Armelle Jardin-Blicq, Hannah Jhee, Vikas Joshi, David Kieda, Gerd J. Kunde, Samridha Kunwar, Alejandro Lara, Jason LEE, William H. Lee, Dirk Lennarz, Hermes Leon Vargas, Anna Lia Longinotti, Ruben Lopez-Coto, Gilgamesh Luis-Raya, Joe Lundeen, Kelly Malone, Vincent Marandon, Oscar M Martinez, Israel Martinez Castellanos, Humberto Martínez Huerta, Jesús Martínez-Castro, John Matthews, Julie McEnery, Pedro Miranda-Romagnoli, Jorge Antonio Morales Soto, Eduardo Moreno Barbosa, Miguel Mostafa, Amid Nayerhoda, Lukas Nellen, Michael Newbold, Mehr Un Nisa, Roberto Noriega-Papaqui, Laura Olivera-Nieto, Nicola Omodei, Alison Peisker, Yunior Pérez Araujo, Eucario Gonzalo Pérez Pérez, Chang Dong Rho, Colas Rivière, Daniel Rosa-Gonzalez, Edna Ruiz-Velasco, James Ryan, Humberto Ibarguen Salazar, Francisco Salesa Greus, Andrés Sandoval, Michael Schneider, Harm Schoorlemmer, José Serna-Franco, Gus Sinnis, Andrew James Smith, Wayne Robert Springer, Pooja Surajbali, Ignacio Taboada, Meghan Tanner, Kirsten Tollefson, Ramiro Torres Escobedo, Rhiannon M. Turner, Fernando Josue Urena Mena, Luis Villaseñor, Xiaojie Wang, Ian James Watson, Thomas Weisgarber, Felix Werner, Elijah Job Willox, Joshua Wood, Gaurang Yodh, Arnulfo Zepeda, and Hao Zhou
Subjects: Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Artificial neural network, High-energy astronomy, business.industry, Astrophysics::High Energy Astrophysical Phenomena, Separation (aeronautics), Hadron, Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, Machine learning, computer.software_genre, Crab Nebula, Observatory, Alternating decision tree, Artificial intelligence, business, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics, computer, Instrumentation and Methods for Astrophysics (astro-ph.IM), Cherenkov radiation
Abstract: Background showers triggered by hadrons represent over 99.9% of all particles arriving at ground-based gamma-ray observatories. An important stage in the data analysis of these observatories, therefore, is the removal of hadron-triggered showers. Currently, the High-Altitude Water Cherenkov (HAWC) gamma-ray observatory employs an algorithm based on a single cut in two variables, unlike other ground-based gamma-ray observatories (e.g. H.E.S.S., VERITAS), which employ a large number of variables to separate the primary particles. In this work, we explore machine learning techniques (Boosted Decision Trees and Neural Networks) to identify the primary particles detected by HAWC. Our new gamma/hadron separation techniques were tested on data from the Crab nebula, the standard reference in Very High Energy astronomy, showing an improvement compared to the standard HAWC background rejection method., Comment: Presented at the 37th International Cosmic Ray Conference (ICRC2021), Berlin, Germany - Online
Published: 2021
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35. Deep observations of Kepler's SNR with H.E.S.S

Author: Jason John Watson, Kleopas Shiningayamwe, Edna Ruiz Velasco, Lenka Tomankova, Martin Tluczykont, Gašper Kukec Mezek, Hend Yassin, Manuel Meyer, Mathieu Naurois, Anton Dmytriiev, Manami Sasaki, Riaan Steenkamp, Andrea Santangelo, T. Chand, Gilles Maurin, J. F. Glicenstein, Jhilik Majumdar, Johannes Schaefer, Christian Stegmann, Stefan Wagner, Andreas Zech, Yasunobu Uchiyama, Bruno Khelifi, Anu Kundu, Hector Rueda Ricarte, Davit Zargaryan, Jacek Niemiec, L. Mohrmann, Arache Djannati-Ataï, Albert Seyffert, V. Sahakian, Anna Barnacka, P. Reichherzer, Gaëtan Fichet de Clairfontaine, Axel Donath, A. W. Chen, Ira Jung, Olaf Reimer, G. Peron, Christo Venter, Garret Cotter, Sebastian Panny, K. Nakashima, K. Bernloehr, Isak Delberth Davids, Victor Barbosa Martins, A. Fiasson, Roberta Zanin, Yves Gallant, Fabian Schüssler, Michael Backes, Heinrich J. Völk, Gerd Puehlhofer, Lei Sun, Thomas Murach, Jean-Pierre Ernenwein, Emmanuel Moulin, G. Lamanna, V. Poireau, Jimmy N.S. Shapopi, Alexandre Marcowith, Felix Werner, Laenita Lorraine Oberholzer, Tim Holch, Naomi Tsuji, Carlo van Rensburg, Zhiqiu Huang, D. A. Prokhorov, K. Kosack, Tadayuki Takahashi, Markus Holler, Q. Remy, Felix Jankowsky, Victor Doroshenko, Felix Aharonian, Johannes Veh, Gerard Fontaine, E. Kasai, G. Vasileiadis, M.-H. Grondin, Anne Lemiere, Floriane Cangemi, Arnaud Mares, Samuel Zouari, Denys Malyshev, Alison Mitchell, Samuel Timothy Spencer, Hester Schutte, Stefan Klepser, Andreas Specovius, Alessandro Montanari, Andreas Zmija, Clemens Hoischen, A. A. Zdziarski, M. Lemoine-Goumard, Emma Ona-Wilhelmi, Yu Wun Wong, Stefan Ohm, Dan Parsons, Johann van der Walt, Vikas Joshi, Brian Reville, Connor Duffy, Michael Kreter, Gianluca Giavitto, D. Malyshev, Thomas Lohse, Mohanraj Senniappan, James Davies, Vincent Marandon, Hannes Thiersen, R. J. Tuffs, Hannah Dalgleish, Vardan Baghmanyan, P. T. O'Brien, Stefano Gabici, Thomas Bylund, Krzysztof Katarzynski, Michal Ostrowski, B. Bi, J.-P. Lenain, Catherine Boisson, Hugh Spackman, Michael Punch, Lukasz Stawarz, Sumari Hattingh, Monica Barnard, Jaqueline Catalano, Takaaki Tanaka, Rowan Batzofin, Mischa Breuhaus, Pauline Chambery, Stefan Funk, Alicja Wierzcholska, R. Konno, Ramin Marx, M. Panter, Anna Luashvili, Justine Devin, J. Bolmont, U. Katz, Francois Brun, Richard White, Jacques Muller, Andrew Taylor, P. Vincent, N. Zywucka, Andreas Quirrenbach, Laura Olivera-Nieto, A. Yusafzai, Dieter Horns, Guillem Marti'i-Devesa, Hassan Abdalla, Heiko Salzmann, Jacco Vink, Mathieu Bony, Oguzhan Anguener, Michael Zacharias, Celine Armand, Atreyee Sinha, Marek Jamrozy, Kirsty Feijen, Faical Ait-Benkhali, Lott Frans, Robert Brose, Santiago Pita, Hambeleleni Ndiyavala, L. Giunti, David Huber, German Hermann, Paul Morris, M. Hörbe, Helene Sol, Sabrina Casanova, Jim Hinton, S. Sailer, Dmitry Khangulyan, Charles Thorpe-Morgan, Sébastien Le Stum, Paolo Marchegiani, Michelle Tsirou, Constantin Steppa, Halim Ashkar, Fabian Leuschner, Ullrich Schwanke, C. Arcaro, Jean Damascene Mbarubucyeye, Wlodek Kluzniak, Gavin Rowell, Regis Terrier, B. Rudak, Carlo Romoli, Kathrin Egberts, Nukri Komin, Tom Armstrong, Frank M. Rieger, Matthieu Renaud, M. Fuessling, David Sanchez, Heike Prokoph, C. Levy, S. Steinmassl, Sami Caroff, Werner Hofmann, Marion Spir-Jacob, S. J. Fegan, Amid Nayerhoda, Sylvia Zhu, P. J. Meintjes, David Berge, Maria Haupt, Christopher van Eldik, Rafal Moderski, Dmitriy Kostunin, Brian van Soelen, Thomas Tavernier, Markus Boettcher, Sabrina Einecke, Iryna Lypova, Anita Reimer, Yvonne Becherini, Rachel Simoni, Angel Noel, Jonathan Mackey, C. Moore, Dorit Glawion, Tomasz Bulik, Malgorzata Curlo, Lente Dreyer, Louis Du Plessis, Naurois , Mathieu, Ona-Wilhelmi , Emma, and Bony , Mathieu
Subjects: Astrophysics::High Energy Astrophysical Phenomena, atmosphere [Cherenkov counter], VHE [gamma ray], IACT, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Cherenkov counter: atmosphere, Kepler, HESS, supernova, Astrophysics::Solar and Stellar Astrophysics, ddc:530, High Energy Stereoscopic System, cosmic radiation: acceleration, Supernova remnant, Cherenkov radiation, Astrophysics::Galaxy Astrophysics, Physics, energy: high, Astrophysics::Instrumentation and Methods for Astrophysics, imaging, Galaxy, Cassiopeia A, Supernova, gamma ray: VHE, high [energy], acceleration [cosmic radiation], galaxy
Abstract: 37th International Cosmic Ray Conference, ICRC 2021, Berlin, online, Germany, 12 Jul 2021 - 23 Jul 2021; Proceedings of Science / International School for Advanced Studies (ICRC2021), 805 (2021). doi:10.22323/1.395.0805, Kepler��s supernova remnant (SNR) which is produced by the most recent naked-eye supernova in our Galaxy is one of the best studied SNRs, but its gamma-ray detection has eluded us so far. Observations with modern imaging atmospheric Cherenkov telescopes (IACT) have enlarged the knowledge about nearby SNRs with ages younger than 500 years by establishing Cassiopeia A and Tycho��s SNRs as very high energy (VHE) gamma-ray sources and setting a lower limit on the distance to Kepler��s SNR. This SNR is significantly more distant than the other two and expected to be one of the faintest gamma-ray sources within reach of the IACT arrays of this generation. We report strong evidence for a VHE signal from Kepler��s SNR based on deep observations of the High Energy Stereoscopic System (H.E.S.S.) with an exposure of 152 hours, including 122 hours accumulated in 2017-2020. We further discuss implications of this result for cosmic-ray acceleration in young SNRs., Published by SISSA, Trieste
Published: 2021
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36. Standardized Formats for Gamma-Ray Analysis Applied to HAWC Observatory Data

Author: Eucario Gonzalo Pérez Pérez, Rishi Babu, Kelly Malone, Ahron S. Barber, Eduardo Moreno Barbosa, Vincent Marandon, Alberto Carramiñana, Ignacio Taboada, Raquel Diaz Hernandez, Vardan Baghmanyan, Ruben Alfaro, Edna Ruiz-Velasco, Guillermo García-Torales, Arun Babu Kollamparambil, Sara Coutiño de Leon, Wayne Robert Springer, Miguel Mostafa, Vikas Joshi, Jason Lee, Brenda Dingus, Daniel Omar Avila Rojas, Cederik León de León, Karen S. Caballero Mora, Ruben Lopez-Coto, Daniel Rosa-Gonzalez, Ke Fang, Hugo Alberto Ayala Solares, Michael Schneider, Francisco Salesa Greus, Felix Werner, José Serna-Franco, Yunior Pérez Araujo, Anna Lia Longinotti, Joshua Wood, Roberto Noriega-Papaqui, Axel Donath, Jorge Cotzomi, Binita Hona, César Alvarez, Gerd J. Kunde, Samridha Kunwar, Kristi Engel, Israel Martinez Castellanos, Josefa Becerra Gonzalez, Harm Schoorlemmer, Alison Peisker, Andrew James Smith, Amid Nayerhoda, J. T. Linnemann, Luis Villaseñor, Henrike Fleischhack, James Ryan, Diego Garcia Aguilar, Jorge Luis Flores, Ibrahim Torres, Jesús Martínez-Castro, Hazal Goksu, Oscar Chaparro-Amaro, Lukas Nellen, Segev BenZvi, J. A. Goodman, Gwenael Giacinti, Juan Carlos Díaz Vélez, Gilgamesh Luis-Raya, Hao Zhou, J. Patrick Harding, Jose Luis García-Luna, Andrea Albert, Armelle Jardin-Blicq, Humberto Martínez Huerta, Kirsten Tollefson, María Catalina Espinoza Hernández, Jorge Antonio Morales Soto, Robert Ellsworth, David Berley, Ernesto Belmont-Moreno, Brian Humensky, Tomás Capistrán, John Matthews, Fernando Garfias, Jim Hinton, Juan Carlos Arteaga Velazquez, Rhiannon Turner, Sergio Hernández Cadena, Xiaojie Wang, Pedro Miranda-Romagnoli, Umberto Cotti, Ramiro Torres Escobedo, Meghan Tanner, Chad Brisbois, Thomas Weisgarber, Arnulfo Zepeda, Nicola Omodei, Sabrina Casanova, Colas Rivière, Oscar Martinez, Anushka Udara Abeysekara, Brian Fick, José Roberto Angeles Camacho, Hermes Leon Vargas, Arturo Iriarte, Laura Olivera-Nieto, Lorenzo Diaz, Elijah Willox, Alejandro Lara, Michael Newbold, Joe Lundeen, Dezhi Huang, Michael DuVernois, Ian Herzog, David Kieda, Hannah Jhee, Nissim Illich Fraija, Maria Magdalena González, Jason Fan, Eduardo de la Fuente, Filiberto Hueyotl-Zahuantitla, Dirk Lennarz, Michelle Hui, Pooja Surajbali, Andrés Sandoval, Gus Sinnis, Fernando Ureña-Mena, Gaurang Yodh, Mora Durocher, Petra Hüntemeyer, Mateo Fernandez Alonso, Jose Andres Garcia-Gonzalez, Juan de Dios Álvarez Romero, William H. Lee, Julie McEnery, Chang Dong Rho, Humberto Ibarguen Salazar, Mehr Nisa, and Ian James Watson
Subjects: HAWC - Abteilung Hinton, High Energy Astrophysical Phenomena (astro-ph.HE), Event (computing), Computer science, FOS: Physical sciences, Proprietary software, Cherenkov Telescope Array, Data sharing, Observatory, Systems engineering, Analysis tools, Common Data Format, Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena, Instrumentation and Methods for Astrophysics (astro-ph.IM), Cherenkov radiation
Abstract: A wide range of data formats and proprietary software have traditionally been used in gamma-ray astronomy, usually developed for a single specific mission or experiment. However, in recent years there has been an increasing effort towards making astronomical data open and easily accessible. Within the gamma-ray community this has translated to the creation of a common data format across different gamma-ray observatories: the "gamma-astro-data-format" (GADF). Based on a similar premise, open-source analysis packages, such as Gammapy, are being developed and aim to provide a single, robust tool which suits the needs of many experiments at once. In this contribution we show that data from the High-Altitude Water Cherenkov (HAWC) observatory can be made compatible with the GADF and present the first GADF-based production of event lists and instrument response functions for a ground-based wide-field instrument. We use these data products to reproduce with excellent agreement the published HAWC Crab spectrum using Gammapy. Having a common data format and analysis tools facilitates joint analysis between different experiments and effective data sharing. This will be especially important for next-generation instruments, such as the proposed Southern Wide-field Gamma-ray Observatory (SWGO) and the planned Cherenkov Telescope Array (CTA)., Comment: Submitted at the 37th International Cosmic Ray conference (ICRC 2021) under the reference PoS(ICRC2021)727
Published: 2021
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37. Evidence of 200 TeV photons from HAWC J1825-134

Author: R. Noriega-Papaqui, J. R. Angeles Camacho, Gerd J. Kunde, Luis Villaseñor, C. Brisbois, K. Tollefson, J. T. Linnemann, Catalina Espinoza, D. Garcia, F. Serna, Nicola Omodei, A. Iriarte, H. A. Ayala Solares, Lukas Nellen, I. Torres, E. Belmont-Moreno, Gwenael Giacinti, A. Sandoval, B. Hona, Segev BenZvi, J. C. Díaz-Vélez, Vincent Marandon, H. Fleischhack, Michael Schneider, J. Lundeen, Mehr Nisa, K. Engel, Vardan Baghmanyan, F. Salesa Greus, Nissim Fraija, K. P. Arunbabu, A. L. Longinotti, M. Mostafá, J. A. Goodman, M. Durocher, A. Jardin-Blicq, C. De León, Andrea Albert, M. Newbold, U. Cotti, Brenda Dingus, J. P. Harding, J. Martínez-Castro, Alejandro Lara, A. Peisker, E. Moreno, Amid Nayerhoda, Daniel Rosa-Gonzalez, Michael DuVernois, A. Carramiñana, Y. Pérez Araujo, H. León Vargas, R. Diaz Hernandez, E. Willox, P. Miranda-Romagnoli, John Matthews, A. Galván-Gámez, E. De la Fuente, D. Avila Rojas, Oscar Martinez, G. Luis-Raya, Sabrina Casanova, V. Joshi, J.C. Arteaga-Velázquez, P. Hüntemeyer, W. H. Lee, Ke Fang, R. Torres-Escobedo, T. Capistrán, J. Cotzomi, F. Ureña-Mena, F. Garfias, Maria Magdalena González, Hongyan Zhou, Filiberto Hueyotl-Zahuantitla, Ruben Alfaro, C. D. Rho, R. W. Springer, H. Salazar, C. Alvarez, D. Huang, K. Malone, E. G. Pérez-Pérez, and Jose Andres Garcia-Gonzalez
Subjects: Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Photon, 010504 meteorology & atmospheric sciences, Proton, Molecular cloud, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, Astronomy and Astrophysics, Cosmic ray, Astrophysics, Radiation, 7. Clean energy, 01 natural sciences, Galaxy, 13. Climate action, Space and Planetary Science, Observatory, 0103 physical sciences, Physics::Accelerator Physics, Astrophysics - High Energy Astrophysical Phenomena, 010303 astronomy & astrophysics, Cherenkov radiation, 0105 earth and related environmental sciences
Abstract: The Earth is bombarded by ultra-relativistic particles, known as cosmic rays (CRs). CRs with energies up to a few PeV (=10$^{15}$ eV), the knee in the particle spectrum, are believed to have a Galactic origin. One or more factories of PeV CRs, or PeVatrons, must thus be active within our Galaxy. The direct detection of PeV protons from their sources is not possible since they are deflected in the Galactic magnetic fields. Hundred TeV $\gamma$-rays from decaying $\pi^0$, produced when PeV CRs collide with the ambient gas, can provide the decisive evidence of proton acceleration up to the knee. Here we report the discovery by the High Altitude Water Cherenkov (HAWC) observatory of the $\gamma$-ray source, HAWC~J1825-134, whose energy spectrum extends well beyond 200 TeV without a break or cutoff. The source is found to be coincident with a giant molecular cloud. The ambient gas density is as high as 700 protons/cm$^3$. While the nature of this extreme accelerator remains unclear, CRs accelerated to energies of several PeV colliding with the ambient gas likely produce the observed radiation., Comment: Accepted for publication in ApJL
Published: 2020

38. Evidence of Cosmic-Ray Excess from Local Giant Molecular Clouds

Author: Giada Peron, Vardan Baghmanyan, Sabrina Casanova, Roberta Zanin, and Felix Aharonian
Subjects: 010504 meteorology & atmospheric sciences, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Cosmic ray, Astrophysics, 01 natural sciences, Power law, Spectral line, law.invention, Hochenergie-Astrophysik Theorie - Abteilung Hinton, Telescope, law, 0103 physical sciences, Astrophysics::Solar and Stellar Astrophysics, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, 0105 earth and related environmental sciences, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Molecular cloud, Gamma ray, Astronomy and Astrophysics, Supernova, Stars, Space and Planetary Science, Astrophysics - High Energy Astrophysical Phenomena
Abstract: We report the analysis of the Fermi-Large Area Telescope data from six nearby giant molecular clouds (MCs) belonging to the Gould Belt and the Aquila Rift regions. The high statistical {\gamma}-ray spectra above 3 GeV well described by power laws make it possible to derive precise estimates of the cosmic-ray (CR) distribution in the MCs. The comparison of {\gamma}-ray spectra of Taurus, Orion A, and Orion B clouds with the model expected from Alpha Magnetic Spectrometer (AMS-02) CR measurements confirms these clouds as passive clouds, immersed in an AMS-02-like CR spectrum. A similar comparison of Aquila Rift, Rho Oph, and Cepheus spectra yields significant deviation in both spectral indices and absolute fluxes, which can imply an additional acceleration of CRs throughout the entire clouds. Besides, the theoretical modeling of the excess {\gamma}-ray spectrum of these clouds, assuming {\pi}0-decay interaction of CRs in the cloud, gives a considerable amount of an enhanced CR energy density and it shows a significant deviation in spectral shapes compared to the average AMS-02 CR spectrum between 30 GeV and 10 TeV. We suggest that this variation in the CR spectrum of Cepheus could be accounted for by an efficient acceleration in the shocks of winds of OB associations, while in Rho Oph, similar acceleration can be provided by multiple T-Tauri stars populated in the whole cloud. In the case of Aquila Rift, the excess in absolute CR flux could be related to an additional acceleration of CRs by supernova remnants or propagation effects in the cloud., Comment: 6 pages, 3 figures. Published in ApJL
Published: 2020

39. HAWC J2227+610 and its association with G106.3+2.7, a new potential Galactic PeVatron

Author: E. Moreno, P. Hüntemeyer, R. Torres-Escobedo, Armelle Jardin-Blicq, R. Noriega-Papaqui, J. T. Linnemann, E. G. Pérez-Pérez, Karen S. Caballero-Mora, J. A. Goodman, J. R. Angeles Camacho, K. Tollefson, Catalina Espinoza, H. León Vargas, H. A. Ayala Solares, J. A. Morales-Soto, Segev BenZvi, A. Galván-Gámez, Luis Villaseñor, Sabrina Casanova, V. Joshi, K. Malone, K. P. Arunbabu, Kwok Lung Fan, D. Garcia, S. Hernandez, U. Cotti, Arnulfo Zepeda, E. De la Fuente, S. S. Marinelli, D. Avila Rojas, E. Belmont-Moreno, Mehr Nisa, Nicola Omodei, H. Schoorlemmer, Andrea Albert, J. P. Harding, F. Garfias, M. Newbold, A. Iriarte, J. D. Álvarez, E. Tabachnick, P. Surajbali, Meghan Tanner, A. J. Smith, B. Hona, C. De León, M. Fernández Alonso, T. Capistrán, P. Miranda-Romagnoli, A. Sandoval, G. Luis-Raya, R. W. Ellsworth, Michael Schneider, Jose Andres Garcia-Gonzalez, E. Ruiz-Velasco, S. Coutiño de León, C. Brisbois, M. Mostafá, Y. Pérez Araujo, J. C. Díaz-Vélez, R. W. Springer, Daniel Rosa-Gonzalez, Amid Nayerhoda, T. Weisgarber, Brenda Dingus, Maria Magdalena González, Nissim Fraija, G. Sinnis, Ke Fang, H. Salazar, Lukas Nellen, Hongyan Zhou, J.C. Arteaga-Velázquez, Michael DuVernois, A. Carramiñana, I. Torres, Gwenael Giacinti, F. Ureña-Mena, Filiberto Hueyotl-Zahuantitla, J. Serna Franco, I. Martinez-Castellanos, C. Alvarez, K. Engel, Ruben Alfaro, C. D. Rho, F. Salesa Greus, A. L. Longinotti, W. H. Lee, A. Peisker, L. Diaz-Cruz, D. Huang, J. Cotzomi, J. Martínez-Castro, O. Tibolla, Henrike Fleischhack, J. Hinton, J. Lundeen, Vardan Baghmanyan, John Matthews, Oscar Martinez, and HAWC Collaboration
Subjects: HAWC - Abteilung Hinton, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Hydrogen compounds, 010504 meteorology & atmospheric sciences, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, Lower limit, Galaxy, Space and Planetary Science, Observatory, 0103 physical sciences, Supernova remnant, Astrophysics - High Energy Astrophysical Phenomena, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, 0105 earth and related environmental sciences
Abstract: We present the detection of VHE gamma-ray emission above 100 TeV from HAWC J2227+610 with the HAWC observatory. Combining our observations with previously published results by VERITAS, we interpret the gamma-ray emission from HAWC J2227+610 as emission from protons with a lower limit in their cutoff energy of 800 TeV. The most likely source of the protons is the associated supernova remnant G106.3+2.7, making it a good candidate for a Galactic PeVatron. However, a purely leptonic origin of the observed emission cannot be excluded at this time., Accepted for publication by ApJL
Published: 2020

40. Constraining the local burst rate density of primordial black holes with HAWC

Author: E. G. Pérez-Pérez, U. Cotti, S. Hernandez, A. J. Smith, T. Capistrán, J.C. Arteaga-Velázquez, K. Malone, W. H. Lee, J. Cotzomi, E. Tabachnick, R. Noriega-Papaqui, E. Belmont-Moreno, A. Iriarte, Joe Lundeen, B. Hona, S. S. Marinelli, Lukas Nellen, Hao Zhou, Alejandro Lara, G. Sinnis, Michael DuVernois, F. Garfias, I. Torres, A. Carramiñana, K. Tollefson, J. Martínez-Castro, Mehr Nisa, C. D. Rho, J. C. Díaz-Vélez, Nissim Fraija, O. Tibolla, C. De León, I. Martinez-Castellanos, E. De la Fuente, Karen S. Caballero-Mora, G. Luis-Raya, R. W. Ellsworth, H. Fleischhack, R. López-Coto, K. Engel, F. Salesa Greus, C. Brisbois, Jose Andres Garcia-Gonzalez, R. W. Springer, A. Galván-Gámez, Sabrina Casanova, H. Martínez-Huerta, V. Joshi, Brenda Dingus, Catalina Espinoza, John N. Wood, H. Salazar, Segev BenZvi, C. Alvarez, Vardan Baghmanyan, A. L. Longinotti, Alison Peisker, John Matthews, K. P. Arunbabu, Oscar Martinez, D. Avila Rojas, H. A. Ayala Solares, Daniel Rosa-Gonzalez, Amid Nayerhoda, Andrea Albert, M. Newbold, M. J. F. Rosenberg, Meghan Tanner, P. Miranda-Romagnoli, P. Hüntemeyer, R. Torres-Escobedo, J. P. Harding, C. Rivière, J. T. Linnemann, Maria Magdalena González, A. Sandoval, J. A. Goodman, Michael Schneider, H. León Vargas, Dezhi Huang, J. A. Morales-Soto, M. Mostafá, Filiberto Hueyotl-Zahuantitla, T. Weisgarber, Arnulfo Zepeda, Ruben Alfaro, and E. Moreno
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Solar mass, Astrophysics::High Energy Astrophysical Phenomena, media_common.quotation_subject, Gamma ray, FOS: Physical sciences, Astronomy and Astrophysics, Primordial black hole, Astrophysics, Universe, High Energy Physics - Experiment, 85-05, Black hole, High Energy Physics - Experiment (hep-ex), RAIOS GAMA, Observatory, Astrophysics - High Energy Astrophysical Phenomena, Cherenkov radiation, Hawking radiation, media_common
Abstract: Primordial Black Holes (PBHs) may have been created by density fluctuations in the early Universe and could be as massive as $> 10^9$ solar masses or as small as the Planck mass. It has been postulated that a black hole has a temperature inversely-proportional to its mass and will thermally emit all species of fundamental particles via Hawking Radiation. PBHs with initial masses of $\sim 5 \times 10^{14}$ g (approximately one gigaton) should be expiring today with bursts of high-energy gamma radiation in the GeV--TeV energy range. The High Altitude Water Cherenkov (HAWC) Observatory is sensitive to gamma rays with energies of $\sim$300 GeV to past 100 TeV, which corresponds to the high end of the PBH burst spectrum. With its large instantaneous field-of-view of $\sim 2$ sr and a duty cycle over 95%, the HAWC Observatory is well suited to perform an all-sky search for PBH bursts. We conducted a search using 959 days of HAWC data and exclude the local PBH burst rate density above $3400~\mathrm{pc^{-3}~yr^{-1}}$ at 99% confidence, the strongest limit on the local PBH burst rate density from any existing electromagnetic measurement., Corresponding authors: K.L. Engel & A. Peisker. 13 pages, 5 figures
Published: 2020

41. Combined Dark Matter searches towards dwarf spheroidal galaxies with Fermi-LAT, HAWC, HESS, MAGIC and VERITAS

Author: Dirk Lennarz, Luis Villaseñor, Gernot Maier, Anne Lemiere, Daniel Rosa-Gonzalez, Samuel Timothy Spencer, Wystan Benbow, Victor Barbosa Martins, Raul Prado, Arache Djannati-Ataï, Regis Terrier, Dan Parsons, Francisco Salesa Greus, Dmitriy Kostunin, Joshua Wood, Carlo Romoli, César Alvarez, Carlo van Rensburg, Massimo Capasso, Sajan Kumar, P. Reichherzer, Anton Dmytriiev, Stefan Ohm, Chiara Giuri, Brian van Soelen, G. Peron, Christian Stegmann, Emma Ona-Wilhelmi, S. J. Fegan, Alison Peisker, Hawc, Garret Cotter, Gary Gillanders, Zhiqiu Huang, Krzysztof Katarzynski, Filiberto Hueyotl-Zahuantitla, Ian Herzog, D. A. Prokhorov, K. Kosack, Halim Ashkar, Fabian Leuschner, Manami Sasaki, Michael Schneider, Joe Lundeen, Markus Boettcher, Brian Humensky, Isak Delberth Davids, A. Fiasson, Stefan Wagner, Andreas Zech, Yasunobu Uchiyama, David Kieda, Michael DuVernois, Albert Seyffert, Gianluca Giavitto, Qi Feng, Andreas Specovius, Andrew James Smith, Catherine Boisson, L. Mohrmann, Roberta Zanin, Marek Jamrozy, Tomás Capistrán Rojas, K. Nakashima, Jamie Holder, Hao Zhou, Thomas Lohse, Mireia Nievas-Rosillo, Samuel Zouari, Ira Jung, Sebastian Panny, K. Bernloehr, Deivid Ribeiro, Andrea Santangelo, Kristi Engel, Josefa Becerra Gonzalez, Thomas Tavernier, Ke Fang, Rishi Babu, Yu Wun Wong, Gerd J. Kunde, Jean-Pierre Ernenwein, Henrike Fleischhack, P. T. O'Brien, Clemens Hoischen, A. A. Zdziarski, Kelly Malone, Helene Sol, Markus Holler, Manel Errando, Atreyee Sinha, Francois Brun, Heinrich J. Völk, Sumari Hattingh, Kirsten Tollefson, Johann van der Walt, Q. Remy, Felix Jankowsky, Samridha Kunwar, Johannes Veh, M. Fuessling, P. Vincent, Harm Schoorlemmer, Stefano Gabici, Miguel Mostafa, Tyler Williamson, Jacek Niemiec, Michal Ostrowski, J.-P. Lenain, Israel Martinez Castellanos, Felix Aharonian, Tadayuki Takahashi, Gerd Puehlhofer, Lei Sun, Jesús Martínez-Castro, Pooja Surajbali, Andrés Sandoval, Hugh Spackman, Takaaki Tanaka, Segev BenZvi, Alexandre Marcowith, Felix Werner, Olaf Reimer, Vincent Marandon, Alberto Carramiñana, S. Steinmassl, Mary Kertzman, Hannes Thiersen, Victor Doroshenko, Michael Backes, Hannah Jhee, G. Lamanna, Marcos Santander, Angel Noel, W. Jin, Gus Sinnis, B. Rudak, Alasdair E. Gent, Kathrin Egberts, Jonathan Mackey, Fernando Ureña-Mena, Paolo Marchegiani, Sonal Ramesh Patel, Laenita Lorraine Oberholzer, Tim Holch, Sami Caroff, Heiko Salzmann, E. Kasai, Alison Mitchell, Gregory Foote, Nukri Komin, Tom Armstrong, Michelle Hui, Ruo-Yu Shang, Binita Hona, Raquel Diaz Hernandez, Vardan Baghmanyan, Celine Armand, Alejandro Lara, David Berley, Hector Rueda Ricarte, Nissim Illich Fraija, Naomi Tsuji, Gaurang Yodh, Stefan Funk, Alicja Wierzcholska, Conor McGrath, Gerard Fontaine, C. Moore, Vikas Joshi, Dorit Glawion, T. Chand, M. U. Nisa, M.-H. Grondin, Arnaud Mares, David Sanchez, Ernesto Belmont-Moreno, Thomas Murach, Eucario Gonzalo Pérez Pérez, Paul Reynolds, Ignacio Taboada, Xiaojie Wang, Lucy Fortson, Martin Tluczykont, Thomas Brian Humensky, Juan de Dios Álvarez Romero, Robert Ellsworth, Hester Schutte, Justine Devin, Constantin Steppa, Richard White, Rachel Simoni, Karen S. Caballero Mora, Elisa Pueschel, Jason Fan, Tomasz Bulik, Lukas Nellen, Malgorzata Curlo, Lente Dreyer, J. Patrick Harding, Gilles Maurin, Humberto Martínez Huerta, Riaan Steenkamp, Arnulfo Zepeda, Johannes Schaefer, Werner Hofmann, Jim Hinton, Michael Punch, S. Sailer, Dmitry Khangulyan, Sergio Hernández Cadena, Charles Thorpe-Morgan, M. Hörbe, Stephan O'Brien, Ramin Marx, John L. Quinn, J. F. Glicenstein, V. Sahakian, M. Panter, Mora Durocher, U. Katz, Jacco Vink, Umberto Cotti, Tobias Kleiner, Petra Hüntemeyer, David Huber, Ullrich Schwanke, Diego Garcia Aguilar, Vladimir Vassiliev, Oscar Martinez, J. Bolmont, Cederik León de León, Brian Fick, Laura Olivera-Nieto, A. Yusafzai, David Hanna, James Buckley, Lorenzo Diaz, Yves Gallant, Guillermo García-Torales, Arun Babu Kollamparambil, James Ryan, Kayla Farrell, Sabrina Casanova, Bruno Khelifi, María Catalina Espinoza Hernández, Jorge Antonio Morales Soto, Mateo Fernandez Alonso, Matthew Lundy, Faical Ait-Benkhali, Jean Damascene Mbarubucyeye, Wlodek Kluzniak, Jorge Luis Flores, Ibrahim Torres, Jordan A. Goodman, Anita Reimer, Adam Otte, Eduardo Moreno Barbosa, M. J. Lang, Frank M. Rieger, Elijah Willox, Colin Adams, Pedro Miranda-Romagnoli, Louis Du Plessis, Andrea Albert, Orel Gueta, Anna Barnacka, Brenda Dingus, Gašper Kukec Mezek, Hazal Goksu, Jorge Cotzomi, William H. Lee, Ruben Alfaro, Glenn Sembroski, David A. Williams, Eduardo de la Fuente, Anu Kundu, Dezhi Huang, Brian Reville, Connor Duffy, Edna Ruiz-Velasco, Anna Luashvili, Alisha Chromey, Konstantin Pfrang, L. Giunti, Philip Kaaret, Maria Magdalena González, Olivier Hervet, Hermes Leon Vargas, Sébastien Le Stum, Amanda Weinstein, Aryeh Brill, James Davies, Ken Ragan, Santiago Pita, Juan Carlos Arteaga Velazquez, Jason Lee, Sabrina Einecke, Lukasz Stawarz, Iryna Lypova, Julie McEnery, Sara Coutiño de Leon, Dieter Horns, R. J. Tuffs, Christo Venter, Meghan Tanner, Monica Barnard, B. Bi, Yvonne Becherini, Colas Rivière, Iftach Sadeh, Lott Frans, Mischa Breuhaus, Pauline Chambery, C. Levy, Jose Luis García-Luna, Michelle Tsirou, D. Malyshev, Ramiro Torres Escobedo, Hassan Abdalla, Hambeleleni Ndiyavala, Chang Dong Rho, Jhilik Majumdar, Martin Pohl, Mathieu Bony, Oguzhan Anguener, Hend Yassin, Gwenael Giacinti, Manuel Meyer, Arturo Iriarte, John Matthews, Kirsty Feijen, Ahron S. Barber, Floriane Cangemi, Fernando Garfias, R. A. Ong, Thomas Weisgarber, Thomas Bylund, Gilgamesh Luis-Raya, Rowan Batzofin, Mathieu Naurois, Jacques Muller, Avery Archer, Andreas Quirrenbach, Anushka Udara Abeysekara, José Serna-Franco, Hugo Alberto Ayala Solares, Davit Zargaryan, Rubén López-Coto, Reshmi Mukherjee, Andreas Zmija, Guillem Marti'i-Devesa, Sameer Patel, M. Lemoine-Goumard, Roberto Noriega-Papaqui, Gaëtan Fichet de Clairfontaine, Axel Donath, A. W. Chen, Michael Kreter, Yunior Pérez Araujo, Anna Lia Longinotti, Michael Zacharias, Kleopas Shiningayamwe, Robert Brose, Fabian Schüssler, Emmanuel Moulin, Patrick Moriarty, Edna Ruiz Velasco, Michael Newbold, Oscar Chaparro-Amaro, J. T. Linnemann, Lenka Tomankova, Jodi Christiansen, Jaqueline Catalano, Ian James Watson, R. Konno, Andrew Taylor, C. Arcaro, Jason John Watson, Gavin Rowell, Daniel Omar Avila Rojas, Denys Malyshev, Emmet Roache, Rhiannon Turner, Chad Brisbois, Mohanraj Senniappan, José Roberto Angeles Camacho, Daniel Nieto, V. Poireau, Jimmy N.S. Shapopi, G. Vasileiadis, Hannah Dalgleish, donggeun tak, Juan Carlos Díaz Vélez, Armelle Jardin-Blicq, N. Zywucka, Abe Falcone, Nicola Omodei, Matthieu Renaud, German Hermann, Paul Morris, Maria Haupt, Stefan Klepser, Christopher van Eldik, Rafal Moderski, Alessandro Montanari, Amy Furniss, Sylvia Zhu, P. J. Meintjes, David Berge, Jose Andres Garcia-Gonzalez, Humberto Ibarguen Salazar, Wayne Robert Springer, Heike Prokoph, Marion Spir-Jacob, Amid Nayerhoda, Laboratoire d'Annecy de Physique des Particules (LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire d'Annecy de Physique des Particules (LAPP), Fermi-LAT, HAWC, H.E.S.S., MAGIC, and VERITAS
Subjects: Cherenkov detector, air, Cherenkov counter: water, Physics beyond the Standard Model, Astrophysics::High Energy Astrophysical Phenomena, Dark matter, satellite, FOS: Physical sciences, IACT, Astrophysics, 01 natural sciences, GLAST, dark matter, law.invention, law, HESS, 0103 physical sciences, 010306 general physics, Cherenkov radiation, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Annihilation, 010308 nuclear & particles physics, background, new physics, imaging, sensitivity, MAGIC, Galaxy, Automatic Keywords, annihilation, VERITAS, galaxy, Astrophysics - High Energy Astrophysical Phenomena, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], statistical, HAWC, Fermi Gamma-ray Space Telescope
Abstract: 36th International Cosmic Ray Conference, ICRC2019, Madison, USA, 24 Jul 2019 - 1 Aug 2019; 9 pages (2019)., The search for Dark Matter (DM) has great potential to reveal physics beyond the Standard Model. As such, searches for evidence of DM particles are being carried out using a wide range of techniques, such as direct searches for DM particles, searches for DM produced with colliders, and indirect searches for the Standard Model annihilation products of DM. Dwarf spheroidal galaxies (dSphs) are excellent targets for indirect Dark Matter searches due to their relatively high DM content and negligible expected astrophysical background. A collaboration was formed to maximise the sensitivity of DM searches towards dSphs by combining for the first time dSph data from three imaging air Cherenkov telescope (IACT) arrays: HESS, MAGIC, and VERITAS; the Fermi-LAT satellite, and the water Cherenkov detector HAWC. Due to the diverse nature of the instruments involved, each experiment will analyse their individual datasets from multiple targets and then the results will be combined at the likelihood level. For consistency of the likelihoods across the five experiments, a common approach is used to treat the astrophysical factor (J-Factor) for each target and an agreed set of annihilation channels are considered. We also agree on a common statistical approach and treatment of instrumental systematic uncertainties. The results are presented in terms of constraints on the velocity-weighted cross section for DM self-annihilation as a function of the DM particle mass.
Published: 2019
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42. Gamma-ray variability of NGC 1275

Author: Vardan Baghmanyan
Subjects: Physics, High energy, Radio galaxy, Astrophysics::High Energy Astrophysical Phenomena, Resolution (electron density), Gamma ray, Light cure, Flux, Spectral analysis, Scale (descriptive set theory), Astrophysics
Abstract: We present the study of high energy γ-ray emission from NGC 1275 radio galaxy using seven years of public available Fermi-LAT data. The recent upgrade to new Pass 8 event-level analysis (with larger acceptance, a better angular and energy resolution and etc.) allows more detailed temporal and spectral analysis. The light cure with 7-day bins reveals several flaring activities, especially during the last two years of observation, when the weekly flux exceeds the averaged flux nearly 5 times. The flaring activities are investigated by the detected spectrum and temporal analysis. The spectral analysis indicates that in the flaring periods the power-law with exponential cut-off modeling is favored over the simple power-law models. The temporal analysis indicates a day scale variability of flux.
Published: 2017
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43. An Optimized Search for Dark Matter in the Galactic Halo with HAWC

Author: Pat Harding, Hazal Goksu, Ernesto Belmont-Moreno, Wayne Robert Springer, Karen S. Caballero Mora, Sara Coutiño de Leon, Jim Hinton, Sergio Hernández Cadena, Edna Ruiz-Velasco, Eduardo Moreno Barbosa, Mora Durocher, Petra Hüntemeyer, Elijah Willox, Brian Humensky, Lukas Nellen, Ahron S. Barber, Hao Zhou, Fernando Garfias, Michelle Hui, Mateo Fernandez Alonso, Diego Garcia Aguilar, Amid Nayerhoda, Jorge Luis Flores, Ibrahim Torres, Harm Schoorlemmer, Thomas Weisgarber, Ke Fang, Ruben Lopez-Coto, John Matthews, María Catalina Espinoza Hernández, David Berley, J. Patrick Harding, Yunior Pérez Araujo, Anna Lia Longinotti, Michael Schneider, Felix Werner, Humberto Martínez Huerta, Josefa Becerra Gonzalez, Maria Magdalena González, Dirk Lennarz, Jorge Antonio Morales Soto, Oscar Martinez, Tomás Capistrán, Xiaojie Wang, Jorge Cotzomi, J. A. Goodman, Juan de Dios Álvarez Romero, Eduardo de la Fuente, Arnulfo Zepeda, Anushka Udara Abeysekara, Ignacio Taboada, Dezhi Huang, Hugo Alberto Ayala Solares, Brian Fick, Hannah Jhee, William H. Lee, Lorenzo Diaz, Miguel Mostafa, Ramiro Torres Escobedo, Julie McEnery, Roberto Noriega-Papaqui, Luis Villaseñor, Pooja Surajbali, Andrés Sandoval, Ruben Alfaro, Samridha Kunwar, Gus Sinnis, Rishi Babu, Filiberto Hueyotl-Zahuantitla, Ian Herzog, Chang Dong Rho, Kelly Malone, Alejandro Lara, Fernando Ureña-Mena, Jason Lee, Israel Martinez Castellanos, Cederik León de León, Daniel Rosa-Gonzalez, Gaurang Yodh, Nicola Omodei, Jose Luis García-Luna, Hawc, Oscar Chaparro-Amaro, Humberto Ibarguen Salazar, Vincent Marandon, Alberto Carramiñana, Robert Ellsworth, Michael DuVernois, Francisco Salesa Greus, Laura Olivera-Nieto, Raquel Diaz Hernandez, Vardan Baghmanyan, Arturo Iriarte, Joshua Wood, Umberto Cotti, Joe Lundeen, Mehr Nisa, Ian James Watson, Jose Andres Garcia-Gonzalez, Sabrina Casanova, Binita Hona, Kristi Engel, César Alvarez, Gerd J. Kunde, James Ryan, Jesús Martínez-Castro, Nissim Illich Fraija, Segev BenZvi, Andrea Albert, Juan Carlos Arteaga Velazquez, Meghan Tanner, Colas Rivière, Jason Fan, David Kieda, Eucario Gonzalo Pérez Pérez, Guillermo García-Torales, Arun Babu Kollamparambil, Alison Peisker, Andrew James Smith, Henrike Fleischhack, José Serna-Franco, J. T. Linnemann, Brenda Dingus, Daniel Omar Avila Rojas, Vikas Joshi, Gwenael Giacinti, Gilgamesh Luis-Raya, Kirsten Tollefson, Michael Newbold, Pedro Miranda-Romagnoli, Hermes Leon Vargas, Juan Carlos Díaz Vélez, Armelle Jardin-Blicq, Rhiannon Turner, Chad Brisbois, and José Roberto Angeles Camacho
Subjects: Galactic halo, Physics, Dark matter, Astrophysics

44. A Novel Approach towards the Search for Gamma-ray Emission from the Northern Fermi Bubble with HAWC

Author: Dirk Lennarz, Segev BenZvi, Wayne Robert Springer, Diego Garcia Aguilar, Jorge Luis Flores, Ibrahim Torres, Hannah Jhee, Miguel Mostafa, Cederik León de León, Gwenael Giacinti, Amid Nayerhoda, Nissim Illich Fraija, Gerd J. Kunde, Eduardo Moreno Barbosa, Juan Carlos Díaz Vélez, Andrea Albert, Michael Newbold, Laura Olivera-Nieto, Jason Fan, Armelle Jardin-Blicq, Eucario Gonzalo Pérez Pérez, Juan Carlos Arteaga Velazquez, José Serna-Franco, Ke Fang, Guillermo García-Torales, Arun Babu Kollamparambil, Meghan Tanner, Maria Magdalena González, Michelle Hui, Colas Rivière, Fernando Garfias, Lukas Nellen, Vikas Joshi, Hazal Goksu, Hao Zhou, J. T. Linnemann, Pedro Miranda-Romagnoli, Robert Ellsworth, Eduardo de la Fuente, David Kieda, Luis Villaseñor, Rishi Babu, Kelly Malone, Thomas Weisgarber, Humberto Ibarguen Salazar, Filiberto Hueyotl-Zahuantitla, Umberto Cotti, Gilgamesh Luis-Raya, J. Patrick Harding, Humberto Martínez Huerta, Kirsten Tollefson, Sabrina Casanova, Vincent Marandon, Alberto Carramiñana, Mehr Nisa, Ernesto Belmont-Moreno, Alison Peisker, Raquel Diaz Hernandez, Vardan Baghmanyan, Brian Humensky, Ian James Watson, Andrew James Smith, Binita Hona, Jorge Cotzomi, Rhiannon Turner, Jose Andres Garcia-Gonzalez, Ramiro Torres Escobedo, Chad Brisbois, Nicola Omodei, Henrike Fleischhack, Ian Herzog, Hermes Leon Vargas, Jim Hinton, Hugo Alberto Ayala Solares, Roberto Noriega-Papaqui, Hawc, Arturo Iriarte, José Roberto Angeles Camacho, Jose Luis García-Luna, Arnulfo Zepeda, James Ryan, Brian Fick, Jesús Martínez-Castro, Sergio Hernández Cadena, Oscar Chaparro-Amaro, Ahron S. Barber, Lorenzo Diaz, Edna Ruiz-Velasco, Juan de Dios Álvarez Romero, Karen S. Caballero Mora, Joe Lundeen, William H. Lee, Julie McEnery, Chang Dong Rho, Elijah Willox, Mora Durocher, Michael Schneider, Felix Werner, Petra Hüntemeyer, Ruben Lopez-Coto, Yunior Pérez Araujo, Anna Lia Longinotti, Mateo Fernandez Alonso, Samridha Kunwar, Israel Martinez Castellanos, César Alvarez, Josefa Becerra Gonzalez, J. A. Goodman, Dezhi Huang, Pooja Surajbali, Andrés Sandoval, Gus Sinnis, Fernando Ureña-Mena, Gaurang Yodh, Harm Schoorlemmer, David Berley, Xiaojie Wang, Sara Coutiño de Leon, Alejandro Lara, Michael DuVernois, John Matthews, Oscar Martinez, María Catalina Espinoza Hernández, Jorge Antonio Morales Soto, Tomás Capistrán, Ignacio Taboada, Ruben Alfaro, Anushka Udara Abeysekara, Jason Lee, Daniel Rosa-Gonzalez, Francisco Salesa Greus, Joshua Wood, Kristi Engel, Brenda Dingus, and Daniel Omar Avila Rojas
Subjects: Physics, Bubble, Gamma ray, Astrophysics, Fermi Gamma-ray Space Telescope

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