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101. Contributions of the LAGO Collaboration to the 36th ICRC

Author

Alberto, A., Alvarez, W., Ancari, L., Uzieda, M. Andrade, Arceo, R., Areso, O., Arnaldi, L. H., Asorey, H., Audelo, M., Berazaín, E., Bertou, X., Bonilla-Rosales, M. J., Caballero-Mora, K. S., Calderón-Ardila, R., García, C. A. Calle, Campelo, J., Campos-Fauth, A., Cando, J., Carramiñana, A., Carrasco-Licea, E., Carrera, E., Castromonte-Flores, C., Cazar, D., Cogollo, D., Conde-Sanchez, R., Cotzomi, J., Dasso, S., De-Castro, A., Echiburú, M., García, L. G., Garibay-Orellana, A., González, M., Grisales-Casadiegos, J., Guachalla, N., Gulisano, A. M., Guzmán, R., Berisso, M. Gómez, Helo, J. C., Hueyotl-Zahuantitla, F., Hurtado, J. S., Jaimes-Motta, A., López, J., Manriquez, D., Bravo, Oscar Martínez, Martínez-Méndez, A., Meza, J. J. Masías, Mayo-García, R., Mijangos, L. G., Miranda, P. P., Montes, E., Morales, I. R., Morales-Olivares, O. G., Moreno, E., Muñoz, P., Navarro, F., Nina, C., Núñez, L. A., Otiniano-Ormachea, L., Paye, P., Pereira, M., Perez, H., Peña-Rodríguez, J., Pinillos, L. P., Pisco-Guabave, J., Ponce-Lancho, E., Pérez-Sánchez, L. R., Ergueta, M. S. Raljevic, Ramelli, M., Bretel, H. M. Rivera, Rosero, C., Rubio-Montero, A. J., Sacahui, J. R., Salazar, H., Samanés-Cárdenas, J., Santos, E., Sarmiento-Cano, C., Sidelnik, I., Haro, M. Sofo, Vasquez, M. A. Subieta, Suárez-Durán, M., Ticona, M., Ordoñez, R. R. Ticona, Peralta, R. D. Ticona, Vega, A., Vega, P., Vega-Martínez, J., Vesga-Ramirez, A., Vitoreti, D., Vásquez, N., Vásquez-Ramírez, A., Zepeda, A., H, Hugo de León, and Alvarez, C.

Subjects
High Energy Physics - Experiment, High Energy Physics - Phenomenology
Abstract

The LAGO (Latin American Giant Observatory) observatory is an experiment that spans over Latin America in a wide range of latitudes that gives different rigidity cut offs for the enter of cosmic rays in the atmosphere. The motivation of the Observatory is to study atmospheric radiation and space weather through the measurement of the secondary emission of low energy cosmic rays at ground level using Water Cherenkov Detectors (WCD). This work presents the contributions of the LAGO collaboration to the 2019 36th ICRC., Comment: International Cosmic Ray Conference 2019

Published
2019

102. Multiple Galactic Sources with Emission Above 56 TeV Detected by HAWC

Author

HAWC Collaboration, Abeysekara, A. U., Albert, A., Alfaro, R., Camacho, J. R. Angeles, Arteaga-Velázquez, J. C., Arunbabu, K. P., Rojas, D. Avila, Solares, H. A. Ayala, Baghmanyan, V., Belmont-Moreno, E., BenZvi, S. Y., Brisbois, C., Caballero-Mora, K. S., Capistrán, T., Carramiñana, A., Casanova, S., Cotti, U., Cotzomi, J., de León, S. Coutiño, De la Fuente, E., de León, C., Dichiara, S., Dingus, B. L., DuVernois, M. A., Díaz-Vélez, J. C., Ellsworth, R. W., Engel, K., Espinoza, C., Fleischhack, H., Fraija, N., Galván-Gámez, A., Garcia, D., García-González, J. A., Garfias, F., González, M. M., Goodman, J. A., Harding, J. P., Hernandez, S., Hinton, J., Hona, B., Huang, D., Hueyotl-Zahuantitla, F., Hüntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kaufmann, S., Kieda, D., Lara, A., Lee, W. H., Vargas, H. León, Linnemann, J. T., Longinotti, A. L., Luis-Raya, G., Lundeen, J., López-Coto, R., Malone, K., Marinelli, S. S., Martinez, O., Martinez-Castellanos, I., Martínez-Castro, J., Martínez-Huerta, H., Matthews, J. A., Miranda-Romagnoli, P., Morales-Soto, J. A., Moreno, E., Mostafá, M., Nayerhoda, A., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Peisker, A., Pérez-Pérez, E. G., Pretz, J., Ren, Z., Rho, C. D., Rivière, C., Rosa-González, D., Rosenberg, M., Ruiz-Velasco, E., Greus, F. Salesa, Sandoval, A., Schneider, M., Schoorlemmer, H., Sinnis, G., Smith, A. J., Springer, R. W., Surajbali, P., Tabachnick, E., Tanner, M., Tibolla, O., Tollefson, K., Torres, I., Torres-Escobedo, R., Villaseñor, L., Weisgarber, T., Wood, J., Yapici, T., Zhang, H., and Zhou, H.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

We present the first catalog of gamma-ray sources emitting above 56 and 100 TeV with data from the High Altitude Water Cherenkov (HAWC) Observatory, a wide field-of-view observatory capable of detecting gamma rays up to a few hundred TeV. Nine sources are observed above 56 TeV, all of which are likely Galactic in origin. Three sources continue emitting past 100 TeV, making this the highest-energy gamma-ray source catalog to date. We report the integral flux of each of these objects. We also report spectra for three highest-energy sources and discuss the possibility that they are PeVatrons., Comment: Accepted by Physical Review Letters

Published
2019
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103. HAWC Contributions to the 36th International Cosmic Ray Conference (ICRC2019)

Author

Abeysekara, A. U., Albert, A., Alfaro, R., Alvarez, C., Álvarez, J. D., Camacho, J. R. Angeles, Arteaga-Velázquez, J. C., Arunbabu, K. P., Rojas, D. Avila, Solares, H. A. Ayala, Baghmanyan, V., Barber, A. S., Gonzalez, J. Becerra, Belmont-Moreno, E., BenZvi, S. Y., Berley, D., Braun, J., Brisbois, C., Caballero-Mora, K. S., Capistrán, T., Carramiñana, A., Casanova, S., Cotti12, U., Cotzomi, J., de León, S. Coutiño, De la Fuente, E., de León, C., Hernandez, R. Diaz, Diaz-Cruz, L., Díaz-Vélez, J. C., Dichiara, S., Dingus, B. L., DuVernois, M. A., Ellsworth, R. W., Engel, K., Enríquez-Rivera, O., Espinoza, C., Alonso, M. Fernández, Fick, B., Fiorino, D. W., Fleischhack, H., Fraija, N., Galván-Gámez, A., García-González, J. A., Garcia-Luna, J. L., Garfias, F., Giacinti, G., González, M. M., Goodman, J. A., Hampel-Arias, Z., Harding, J. P., Hernandez, S., Hinton, J., Hona, B., Huang, D., Hueyotl-Zahuantitla, F., Hui, C. M., Hüntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kieda, D., Kunde, G. J., Lara, A., Lauer, R. J., Lee, W. H., Lennarz, D., Vargas, H. León, Linnemann, J. T., Longinotti, A. L., López-Coto, R., Luis-Raya, G., Lundeen, J., Malone, K., Marandon, V., Marinelli, S. S., Martinez, O., Martinez-Castellanos, I., Martínez-Castro, J., Martínez-Huerta, H., Matthews, J. A. J., McEnery, J., Miranda-Romagnoli, P., Morales-Soto, J. A., Moreno, E., Mostafá, M., Nayerhoda, A., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Peisker, A., Araujo, Y. Pérez, Pérez-Pérez, E. G., Ren, Z., Rho, C. D., Rivière, C., Rosa-González, D., Rosenberg, M., Ruiz-Velasco, E., Ryan, J., Salazar, H., Greus, F. Salesa, Sandoval, A., Schneider, M., Schoorlemmer, H., Arroyo, M. Seglar, Sinnis, G., Smith, A. J., Springer, R. W., Surajbali, P., Tabachnick, E., Taboada, I., Tanner, M., Tollefson, K., Torres, I., Torres-Escobedo, R., Ukwatta, T. N., Vianello, G., Villaseñor, L., Weisgarber, T., Werner, F., Westerhoff, S., Wisher, I. G., Wood, J., Yapici, T., Yodh, G. B., Younk, P. W., Zepeda, A., and Zhou, H.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Experiment
Abstract

List of proceedings from the HAWC Collaboration presented at the 36th International Cosmic Ray Conference, 24 July - 1 August 2019, Madison, Wisconsin, USA., Comment: List of proceedings from the HAWC Collaboration presented at ICRC2019. Corrected typos in the index of the previous version. Follow the "HTML" link to access the list

Published
2019

104. Spectral analysis of the blazars Markarian 421 and Markarian 501 with the HAWC Gamma-Ray Observatory

Author

de León, Sara Coutiño, Alonso, Alberto Carramiñana, Rosa-González, Daniel, and Longinotti, Anna Lia

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

The High Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory surveys the very high energy sky in the $\sim300$ to 100 TeV energy range and has detected two high-synchrotron-peaked BL Lacertae objects, Markarian 421 and Markarian 501 in a period of time of 837 days between June 2015 and December 2017. In this work, we present the detailed time-average spectral analysis. Using an extragalactic background light model, we address the difference in the intrinsic spectral properties between the two blazars above 1 TeV, preliminary results show that the intrinsic spectrum of Mrk 421 is better described by a power-law with an exponential energy cut-off function with photon index $\alpha_{421}=2.22\pm0.10$ and energy cut-off $Ec_{421}=5.24\pm1.02$ TeV, and for Mrk 501 the intrinsic spectrum is well described by a power-law with spectral index $\alpha_{501}=2.40\pm0.06$, without requiring an energy cut-off.

Published
2019

105. A survey of Active Galaxies with the HAWC Gamma-ray Observatory

Author

Carramiñana, Alberto, González, Daniel Rosa, de León, Sara Coutiño, and Longinotti, Anna Lia

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

The High Altitude Water Cherenkov Gamma-Ray Observatory has been accumulating a progressively deeper exposure of the TeV sky since its inauguration in March 2015. Located at geographical latitude $+19^\circ$N, HAWC has been able to perform a deep and unbiased survey of two thirds of the sky. We analyzed three years of HAWC data searching for long term persistent emission from a redshift limited ($z\leq 0.3$) sample of active galactic nuclei drawn from the {\it Fermi}-LAT 3FHL catalog. The HAWC dataset confirms the high significance detection of the two nearest BL Lac objects, \mbox{Mrk 421} and \mbox{Mrk 501}, and sets limits for the rest of the sample, down to integrated photon fluxes of order $N(>0.5~{\rm TeV})\lesssim 10^{-12}\,\rm cm^{-2}s^{-1}$. We present and discuss some of the results of this survey, focusing on individual objects of particular interest., Comment: Contribution to the International Cosmic Ray Conference ICRC 2019. 8 pages, 3 figures. A couple of errors in Table 1 have been corrected

Published
2019

106. The Southern Wide-Field Gamma-Ray Observatory (SWGO): A Next-Generation Ground-Based Survey Instrument for VHE Gamma-Ray Astronomy

Author

Abreu, P., Albert, A., Alfaro, R., Alvarez, C., Arceo, R., Assis, P., Barao, F., Bazo, J., Beacom, J. F., Bellido, J., BenZvi, S., Bretz, T., Brisbois, C., Brown, A. M., Brun, F., Buscemi, M., Mora, K. S. Caballero, Camarri, P., Carramiñana, A., Casanova, S., Chiavassa, A., Conceição, R., Cotter, G., Cristofari, P., Dasso, S., De Angelis, A., De Maria, M., Desiati, P., Di Sciascio, G., Vélez, J. C. Díaz, Dib, C., Dingus, B., Dorner, D., Doro, M., Duffy, C., DuVernois, M., Engel, R., Alonso, M. Fernandez, Fleischhack, H., Fonte, P., Fraija, N., Funk, S., García-González, J. A., González, M. M., Goodman, J. A., Greenshaw, T., Harding, J. P., Haungs, A., Hona, B., Huentemeyer, P., Insolia, A., Jardin-Blicq, A., Joshi, V., Kawata, K., Kunwar, S., La Mura, G., Lapington, J., Lenain, J. P., López-Coto, R., Malone, K., Martinez-Castro, J., Martínez-Huerta, H., Mendes, L., Moreno, E., Mostafá, M., Ng, K. C. Y., Nisa, M. U., Peron, F., Pichel, A., Pimenta, M., Prandini, E., Rainò, S., Reisenegger, A., Rodriguez, J., Roth, M., Rovero, A., Ruiz-Velasco, E., Sako, T., Sandoval, A., Santander, M., Satalecka, K., Schneider, M., Schoorlemmer, H., Schüssler, F., Shellard, R. C., Smith, A., Spencer, S., Springer, W., Surajbali, P., Tollefson, K., Tomé, B., Torres, I., Viana, A., Weisgarber, T., Wischnewski, R., Zepeda, A., Zhou, B., and Zhou, H.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena
Abstract

We describe plans for the development of the Southern Wide-field Gamma-ray Observatory (SWGO), a next-generation instrument with sensitivity to the very-high-energy (VHE) band to be constructed in the Southern Hemisphere. SWGO will provide wide-field coverage of a large portion of the southern sky, effectively complementing current and future instruments in the global multi-messenger effort to understand extreme astrophysical phenomena throughout the universe. A detailed description of science topics addressed by SWGO is available in the science case white paper [1]. The development of SWGO will draw on extensive experience within the community in designing, constructing, and successfully operating wide-field instruments using observations of extensive air showers. The detector will consist of a compact inner array of particle detection units surrounded by a sparser outer array. A key advantage of the design of SWGO is that it can be constructed using current, already proven technology. We estimate a construction cost of 54M USD and a cost of 7.5M USD for 5 years of operation, with an anticipated US contribution of 20M USD ensuring that the US will be a driving force for the SWGO effort. The recently formed SWGO collaboration will conduct site selection and detector optimization studies prior to construction, with full operations foreseen to begin in 2026. Throughout this document, references to science white papers submitted to the Astro2020 Decadal Survey with particular relevance to the key science goals of SWGO, which include unveiling Galactic particle accelerators [2-10], exploring the dynamic universe [11-21], and probing physics beyond the Standard Model [22-25], are highlighted in red boldface., Comment: Astro2020 APC White Paper

Published
2019

107. Quadratic Planar Differential Systems with Algebraic Limit Cycles via Quadratic Plane Cremona Maps

Author

Alberich-Carramiñana, Maria, Ferragut, Antoni, and Llibre, Jaume

Subjects
Mathematics - Dynamical Systems, Mathematics - Algebraic Geometry, 34A05, 34A34, 34C05
Abstract

In this paper we show how we can transform quadratic systems into new quadratic systems after some kind of birational transformations, the quadratic plane Cremona maps. We afterwards apply these transformations to the families of quadratic differential systems having an algebraic limit cycle. As a consequence, we provide a new family of quadratic systems having an algebraic limit cycle of degree 5. Moreover we show how the known families of quadratic differential systems having an algebraic limit cycle of degree greater than four are obtained using these transformations. We also provide the phase portraits on the Poincar\'e disk of all the families of quadratic differential systems having algebraic limit cycles., Comment: 28 pages, 20 figures

Published
2019

108. Measurement of the Crab Nebula Spectrum Past 100 TeV with HAWC

Author

HAWC Collaboration, Abeysekara, A. U., Albert, A., Alfaro, R., Alvarez, C., Álvarez, J. D., Camacho, J. R. Angeles, Acero, R., Arteaga-Velázquez, J. C., Arunbabu, K. P., Rojas, D. Avila, Solares, H. A. Ayala, Baghmanyan, V., Belmont-Moreno, E., BenZvi, S. Y., Brisbois, C., Cabellero-Mora, K. S., Capistrán, T., Carramiñana, A., Casanova, S., Cotti, U., Cotzomi, J., de León, S. Coutiño, De la Fuente, E., de León, C., Dichiara, S., Dingus, B. L., DuVernois, M. A., Díaz-Vélez, J. C., Ellsworth, R. W., Engel, K., Espinoza, C., Fick, B., Fleischhack, H., Fraija, N., Galván-Gámez, A., García-González, J. A., Garfias, F., González, M. M., Goodman, J. A., Harding, J. P., Hernandez, S., Hinton, J., Hona, B., Hueyotl-Zahuantitla, F., Hui, C. M., Hüntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kaufmann, S., Kieda, D., Lara, A., Lee, W. H., Vargas, H. León, Linnemann, J. T., Longinotti, A. L., Luis-Raya, G., Lundeen, J., Malone, K., Marinelli, S. S., Martinez, O., Martinez-Castellanos, I., Martínez-Castro, J., Martínez-Huerta, H., Matthews, J. A., Miranda-Romagnoli, P., Morales-Soto, J. A., Moreno, E., Mostafá, M., Nayerhoda, A., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Peisker, A., Pérez-Pérez, E. G., Pretz, J., Ren, Z., Rho, C. D., Rivière, C., Rosa-González, D., Rosenberg, M., Ruiz-Velasco, E., Salazar, H., Greus, F. Salesa, Sandoval, A., Schneider, M., Schoorlemmer, H., Arroyo, M. Seglar, Sinnis, G., Smith, A. J., Springer, R. W., Surajbali, P., Tabachnick, E., Tanner, M., Tibolla, O., Tollefson, K., Torres, I., Weisgarber, T., Westerhoff, S., Wood, J., Yapici, T., Zepeda, A., and Zhou, H.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

We present TeV gamma-ray observations of the Crab Nebula, the standard reference source in ground-based gamma-ray astronomy, using data from the High Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory. In this analysis we use two independent energy-estimation methods that utilize extensive air shower variables such as the core position, shower angle, and shower lateral energy distribution. In contrast, the previously published HAWC energy spectrum roughly estimated the shower energy with only the number of photomultipliers triggered. This new methodology yields a much improved energy resolution over the previous analysis and extends HAWC's ability to accurately measure gamma-ray energies well beyond 100 TeV. The energy spectrum of the Crab Nebula is well fit to a log parabola shape $\left(\frac{dN}{dE} = \phi_0 \left(E/\textrm{7 TeV}\right)^{-\alpha-\beta\ln\left(E/\textrm{7 TeV}\right)}\right)$ with emission up to at least 100 TeV. For the first estimator, a ground parameter that utilizes fits to the lateral distribution function to measure the charge density 40 meters from the shower axis, the best-fit values are $\phi_o$=(2.35$\pm$0.04$^{+0.20}_{-0.21}$)$\times$10$^{-13}$ (TeV cm$^2$ s)$^{-1}$, $\alpha$=2.79$\pm$0.02$^{+0.01}_{-0.03}$, and $\beta$=0.10$\pm$0.01$^{+0.01}_{-0.03}$. For the second estimator, a neural network which uses the charge distribution in annuli around the core and other variables, these values are $\phi_o$=(2.31$\pm$0.02$^{+0.32}_{-0.17}$)$\times$10$^{-13}$ (TeV cm$^2$ s)$^{-1}$, $\alpha$=2.73$\pm$0.02$^{+0.03}_{-0.02}$, and $\beta$=0.06$\pm$0.01$\pm$0.02. The first set of uncertainties are statistical; the second set are systematic. Both methods yield compatible results. These measurements are the highest-energy observation of a gamma-ray source to date., Comment: published in ApJ

Published
2019
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109. The minimal Tjurina number of irreducible germs of plane curve singularities

Author

Alberich-Carramiñana, Maria, Almirón, Patricio, Blanco, Guillem, and Melle-Hernández, Alejandro

Subjects
Mathematics - Algebraic Geometry, Mathematics - Commutative Algebra
Abstract

In this paper we give a positive answer to a question of Dimca and Greuel about the quotient between the Milnor and the Tjurina numbers for any irreducible germ of plane curve singularity. This result is based on a closed formula for the minimal Tjurina number of an equisingularity class in terms of the sequence of multiplicities of the strict transform along a resolution. The key points for the proof are previous results by Genzmer, Wall and Mattei., Comment: To appear in Indiana University Mathematics Journal. Minor changes. Improvement in Corollary 2

Published
2019

110. Pulsars in a Bubble? Following Electron Diffusion in the Galaxy with TeV Gamma Rays

Author

Fleischhack, H., Albert, A., Alvarez, C., Arceo, R., Beacom, J. F., Bird, R., Brisbois, C. A., Caballero-Mora, K. S., Carraminana, A., Casanova, S., Cristofari, P., Coppi, P., Dingus, B. L., DuVernois, M. A., Engel, K. L., Goodman, J. A., Greenshaw, T., Harding, J. P., Hona, B., Huentemeyer, P. H., Li, H., Linden, T., Malone, K., Martinez-Castro, J., Mostafa, M. A., Nisa, M. U., Riviere, C., Greus, F. Salesa, Sandoval, A., Smith, A. J., Springer, W., Sudoh, T., Tollefson, K., Zepeda, A., and Zhou, H.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

TeV Halos, extended regions of TeV gamma-ray emission around middle-aged pulsars, have recently been established as a new source class in gamma-ray astronomy. These halos have been attributed to relativistic electrons and positrons that have left the acceleration region close to the pulsar and are diffusing in the surrounding medium. Measuring the morphology of TeV Halos enables for the first time a direct measurement of the electron diffusion on scales of tens of parsecs. There are hints that the presence of relativistic particles affects the diffusion rate in the pulsars' surroundings. Understanding electron diffusion is necessary to constrain the origins of the apparent `excess' of cosmic-ray positrons at tens of GeV. TeV Halos can also be used to find mis-aligned pulsars, as well as study certain properties of the Galaxy's pulsar population. Future VHE gamma-ray instruments will detect more of those TeV Halos and determine how much pulsars contribute to the observed cosmic-ray electron and positron fluxes, and how they affect diffusion in their environments., Comment: Whitepaper for the US Astro2020 decadal survey

Published
2019

111. Science Case for a Wide Field-of-View Very-High-Energy Gamma-Ray Observatory in the Southern Hemisphere

Author

Albert, A., Alfaro, R., Ashkar, H., Alvarez, C., Álvarez, J., Arteaga-Velázquez, J. C., Solares, H. A. Ayala, Arceo, R., Bellido, J. A., BenZvi, S., Bretz, T., Brisbois, C. A., Brown, A. M., Brun, F., Caballero-Mora, K. S., Carosi, A., Carramiñana, A., Casanova, S., Chadwick, P. M., Cotter, G., De León, S. Coutiño, Cristofari, P., Dasso, S., de la Fuente, E., Dingus, B. L., Desiati, P., Salles, F. de O., de Souza, V., Dorner, D., Díaz-Vélez, J. C., García-González, J. A., DuVernois, M. A., Di Sciascio, G., Engel, K., Fleischhack, H., Fraija, N., Funk, S., Glicenstein, J-F., Gonzalez, J., González, M. M., Goodman, J. A., Harding, J. P., Haungs, A., Hinton, J., Hona, B., Hoyos, D., Huentemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kaufmann, S., Kawata, K., Kunwar, S., Lefaucheur, J., Lenain, J. -P., Link, K., López-Coto, R., Marandon, V., Mariotti, M., Martínez-Castro, J., Martínez-Huerta, H., Mostafá, M., Nayerhoda, A., Nellen, L., Wilhelmi, E. de Oña, Parsons, R. D., Patricelli, B., Pichel, A., Piel, Q., Prandini, E., Pueschel, E., Procureur, S., Reisenegger, A., Rivière, C., Rodriguez, J., Rovero, A. C., Rowell, G., Ruiz-Velasco, E. L., Sandoval, A., Santander, M., Sako, T., Sako, T. K., Satalecka, K., Schoorlemmer, H., Schüssler, F., Seglar-Arroyo, M., Smith, A. J., Spencer, S., Surajbali, P., Tabachnick, E., Taylor, A. M., Tibolla, O., Torres, I., Vallage, B., Viana, A., Watson, J. J., Weisgarber, T., Werner, F., White, R., Wischnewski, R., Yang, R., Zepeda, A., and Zhou, H.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

We outline the science motivation for SGSO, the Southern Gamma-Ray Survey Observatory. SGSO will be a next-generation wide field-of-view gamma-ray survey instrument, sensitive to gamma-rays in the energy range from 100 GeV to hundreds of TeV. Its science topics include unveiling galactic and extragalactic particle accelerators, monitoring the transient sky at very high energies, probing particle physics beyond the Standard Model, and the characterization of the cosmic ray flux. SGSO will consist of an air shower detector array, located in South America. Due to its location and large field of view, SGSO will be complementary to other current and planned gamma-ray observatories such as HAWC, LHAASO, and CTA.

Published
2019

112. MAGIC and Fermi-LAT gamma-ray results on unassociated HAWC sources

Author

Ahnen, M. L., Ansoldi, S., Antonelli, L. A., Arcaro, C., Baack, D., Babić, A., Banerjee, B., Bangale, P., de Almeida, U. Barres, Barrio, J. A., González, J. Becerra, Bednarek, W., Bernardini, E., Berse, R. Ch., Berti, A., Bhattacharyya, W., Biland, A., Blanch, O., Bonnoli, G., Carosi, R., Carosi, A., Ceribella, G., Chatterjee, A., Colak, S. M., Colin, P., Colombo, E., Contreras, J. L., Cortina, J., Covino, S., Cumani, P., Da Vela, P., Dazzi, F., De Angelis, A., De Lotto, B., Delfino, M., Delgado, J., Di Pierro, F., Domínguez, A., Prester, D. Dominis, Dorner, D., Doro, M., Einecke, S., Elsaesser, D., Ramazani, V. Fallah, Fernández-Barral, A., Fidalgo, D., Fonseca, M. V., Font, L., Fruck, C., Galindo, D., López, R. J. García, Garczarczyk, M., Gaug, M., Giammaria, P., Godinović, N., Gora, D., Guberman, D., Hadasch, D., Hahn, A., Hassan, T., Hayashida, M., Herrera, J., Hose, J., Hrupec, D., Ishio, K., Konno, Y., Kubo, H., Kushida, J., Kuveždić, D., Lelas, D., Lindfors, E., Lombardi, S., Longo, F., López, M., Maggio, C., Majumdar, P., Makariev, M., Maneva, G., Manganaro, M., Mannheim, K., Maraschi, L., Mariotti, M., Martínez, M., Masuda, S., Mazin, D., Mielke, K., Minev, M., Miranda, J. M., Mirzoyan, R., Moralejo, A., Moreno, V., Moretti, E., Nagayoshi, T., Neustroev, V., Niedzwiecki, A., Rosillo, M. Nievas, Nigro, C., Nilsson, K., Ninci, D., Nishijima, K., Noda, K., Nogués, L., Paiano, S., Palacio, J., Paneque, D., Paoletti, R., Paredes, J. M., Pedaletti, G., Peresano, M., Persic, M., Moroni, P. G. Prada, Prandini, E., Puljak, I., Garcia, J. R., Reichardt, I., Rhode, W., Ribó, M., Rico, J., Righi, C., Rugliancich, A., Saito, T., Satalecka, K., Schweizer, T., Sitarek, J., Šnidarić, I., Sobczynska, D., Stamerra, A., Strzys, M., Surić, T., Takahashi, M., Takalo, L., Tavecchio, F., Temnikov, P., Terzić, T., Teshima, M., Torres-Albà, N., Treves, A., Tsujimoto, S., Vanzo, G., Acosta, M. Vazquez, Vovk, I., Ward, J. E., Will, M., Zarić, D., Albert, A., Alfaro, R., Alvarez, C., Arceo, R., Arteaga-Velázquez, J. C., Rojas, D. Avila, Solares, H. A. Ayala, Becerril, A., Belmont-Moreno, E., BenZvi, S. Y., Bernal, A., Braun, J., Caballero-Mora, K. S., Capistrán, T., Carramiñana, A., Casanova, S., Castillo, M., Cotti, U., Cotzomi, J., de León, S. Coutiño, De León, C., De la Fuente, E., Hernandez, R. Diaz, Dichiara, S., Dingus, B. L., DuVernois, M. A., Díaz-Vélez, J. C., Ellsworth, R. W., Engel, K., Enriquez-Rivera, O., Fiorino, D. W., Fleischhack, H., Fraija, N., García-González, J. A., Garfias, F., González-Muñoz, A., González, M. M., Goodman, J. A., Hampel-Arias, Z., Harding, J. P., Hernandez, S., Hueyotl-Zahuantitla, F., Hui, C. M., Hüntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kaufmann, S., Lara, A., Lauer, R. J., Lee, W. H., Lennarz, D., Vargas, H. León, Linnemann, J. T., Longinotti, A. L., Luis-Raya, G., Luna-García, R., López-Coto, R., Malone, K., Marinelli, S. S., Martinez, O., Martinez-Castellanos, I., Martínez-Castro, J., Martínez-Huerta, H., Matthews, J. A., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nayerhoda, A., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Pelayo, R., Pretz, J., Pérez-Pérez, E. G., Ren, Z., Rho, C. D., Rivière, C., Rosa-González, D., Rosenberg, M., Ruiz-Velasco, E., Greus, F. Salesa, Sandoval, A., Schneider, M., Arroyo, M. Seglar, Sinnis, G., Smith, A. J., Springer, R. W., Surajbali, P., Taboada, I., Tibolla, O., Tollefson, K., Torres, I., Ukwatta, T. N., Vianello, G., Villaseñor, L., Werner, F., Westerhoff, S., Wood, J., Yapici, T., Yodh, G., Zepeda, A., Zhou, H., Álvarez, J. D., Ajello, M., Baldini, L., Barbiellini, G., Berenji, B., Bissaldi, E., Blandford, R. D., Bonino, R., Bottacini, E., Brandt, T. J., Bregeon, J., Bruel, P., Cameron, R. A., Caputo, R., Caraveo, P. A., Castro, D., Cavazzuti, E., Chiaro, G., Ciprini, S., Costantin, D., D'Ammando, F., de Palma, F., Desai, A., Di Lalla, N., Di Mauro, M., Di Venere, L., Favuzzi, C., Fukazawa, Y., Funk, S., Fusco, P., Gargano, F., Gasparrini, D., Giglietto, N., Giordano, F., Giroletti, M., Glanzman, T., Green, D., Grenier, I. A., Guiriec, S., Harding, A. K., Hays, E., Hewitt, J. W., Horan, D., Jóhannesson, G., Kuss, M., Larsson, S., Liodakis, I., Loparco, F., Lubrano, P., Magill, J. D., Maldera, S., Manfreda, A., Mazziotta, M. N., Mereu, I., Michelson, P. F., Mizuno, T., Monzani, M. E., Morselli, A., Moskalenko, I. V., Negro, M., Nuss, E., Omodei, N., Orienti, M., Orlando, E., Ormes, J. F., Palatiello, M., Paliya, V. S., Pesce-Rollins, M., Petrosian, V., Piron, F., Porter, T. A., Principe, G., Rainò, S., Rani, B., Razzano, M., Razzaque, S., Reimer, A., Reimer, O., Sgrò, C., Siskind, E. J., Spandre, G., Spinelli, P., Tajima, H., Thayer, J. B., Thompson, D. J., Torres, D. F., Torresi, E., Troja, E., Valverde, J., Wood, K., and Yassine, M.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

The HAWC Collaboration released the 2HWC catalog of TeV sources, in which 19 show no association with any known high-energy (HE; E > 10 GeV) or very-high-energy (VHE; E > 300 GeV) sources. This catalog motivated follow-up studies by both the MAGIC and Fermi-LAT observatories with the aim of investigating gamma-ray emission over a broad energy band. In this paper, we report the results from the first joint work between HAWC, MAGIC and Fermi-LAT on three unassociated HAWC sources: 2HWC J2006+341, 2HWC J1907+084* and 2HWC J1852+013*. Although no significant detection was found in the HE and VHE regimes, this investigation shows that a minimum 1 degree extension (at 95% confidence level) and harder spectrum in the GeV than the one extrapolated from HAWC results are required in the case of 2HWC J1852+013*, while a simply minimum extension of 0.16 degrees (at 95% confidence level) can already explain the scenario proposed by HAWC for the remaining sources. Moreover, the hypothesis that these sources are pulsar wind nebulae is also investigated in detail., Comment: 12 pages, 3 figures. Accepted for publication in MNRAS

Published
2019
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113. Risk assessment for major adverse cardiovascular events after noncardiac surgery using self-reported functional capacity: international prospective cohort study

Author

Lurati, Giovanna, Spadaro, Savino, Matute, Purificación, Ionescu, Daniela, Bolliger, Daniel, Szczeklik, Wojciech, Turhan, Sanem Cakar, van Waes, Judith, Lagarto, Filipa, Theodoraki, Kassiani, Howell, Simon J., Gupta, Anil, De Hert, Stefan, Ovezov, Alexey, Tollinche, Luis E., Kuzmanovska, Biljana, Barisin, Stjepan, Poredos, Peter, Arabadzhieva, Daniela, Unic-Stojanovic, Dragana, Fleischmann, Edith, Meistelman, Claude, Buggy, Donal J., Calleja, Paul, Hasani, Antigona, Kemper, Johann, Kohaupt, Lena, Witzler, Jette, Tuzhikov, Michael, Roth, Sebastian, Stroda, Alexandra, Schultze, Cornelia, Verbarg, Nele, Gehrke, Christian, Klemann, Anna Katharina, Hagebölling, Friederike, Albrecht, Svenja, Stroeder, Jakob, Schubert, Ann-Kristin, Espeter, Florian, Russe, Benedikt, Weigand, Markus A., Bergmann, Lars, Unterberg, Matthias, Bischoff, Petra, Pirzer, Raphael, Rach, Patric Rene, Ott, Klaus, Zarbock, Alexander, Kowark, Ana, Neumann, Claudia, Marchand, Bahareh, Sponholz, Christoph, Rueffert, Henrik, Kramer, Mira, Piekarski, Florian, Carollo, Melissa, Novazzi, Cecilia, Toso, Fiorenza, Bacuzzi, Alessandro, Ragazzi, Riccardo, Volta, Carlo Alberto, De Giorgi, Francesco, Bacer, Barbara, Federico, Antonio, Chiumello, Davide, Vetrugno, Luigi, Castella, Alberto, Tesoro, Simonetta, Cotoia, Antonella, Bignami, Elena, Bellissima, Agrippino, Cortegiani, Andrea, Crisman, Marco, Toninelli, Arturo, Piazza, Ornella, Mirabella, Lucia, Bossolasco, Matteo, Bona, Francesco, Perdomo, Juan Manuel, Coca-Martinez, Miquel, Carramiñana, Albert, Servén, Marta Giné, González, Astrid Batalla, Gil Sánchez, José Maria, Becerra-Bolaños, Ángel, Rodríguez-Pérez, Aurelio, Soler, Anna Artigas, Basso, Morena, Font, Anna Peig, Vernetta, Diana, Santos, Julia Hernando, Muñoz, Enrique Alday, Olivares, Mercedes Cabellos, Marco, Gregorio, Lopez, Maria Bermudez, Barrio, Javier, Forés, María Isabel, Boix, Estefanía, Ayuso, Mercedes, Petre, Bogdan Sorel, Oprea, Ioana Sorina, Latiș, Mihai Dan, Margarit, Simona, Vasian, Horatiu, Tomescu, Dana, Cîndea, Iulia, Dirzu, Dan Sebastian, Copotoiu, Sanda-Maria, Moise, Alida, Bubenek-Turconi, Serban, Valeanu, Liana, Wanner, Patrick Mark, Djurdjevic, Mirjana, Nuth, Sandra, Seeberger, Esther, Goettel, Nicolai, Kamber, Firmin, Ganter, Michael Thomas, Gerber, Thomas Jan, Schneebeli, Daniela, Pregernig, Andreas, Grape, Sina, Tomala, Simon, Pinto, Bernardo Bollen, Żukowski, Maciej, Zegan-Barańska, Małgorzata, Karolak, Igor, Krzych, Lukasz, Czajka, Szymon, Studzińska, Dorota, Kluzik, Anna, Koszel, Tomasz, Pabjańczyk, Izabela, Gajdosz, Anna, Erkoc, Suheyla Karadag, Meco, Basak Ceyda, Koltka, Ahmet Kemalettin, Dincer, Muserref Beril, Ekmekçi, Perihan, Saracoglu, Kemal Tolga, Solmaz, Filiz Alkaya, Ozcelik, Menekse, Arun, Oguzhan, Dilmen, Ozlem Korkmaz, Preckel, Benedikt, Hollmann, Markus W., Hazen, Yannick, Donald de Boer, Hans, Epema, Anne, Koopman, Seppe, Van Lier, Felix, Pinto, Rita, Carrão, André, Ribeiro, Daniel, Mourão, Joana, Coelho, Miguel, Losa, Nuno, Santos, Nuno, Cabral, Luis, Afonso, Diana, Zenha, Sérgio, Ramos, Cristina, Hipólito, Carla, Vasilaki, Maria, Andreeva, Antonia, Zaimi, Donika, Chalkias, Athanasios, Spyraki, Maria, Rekatsina, Martina, Tsaousi, Georgia, Short, Anthony, Meier, Sonja, Madhuri, Thumuluru Kavitha, Latham, Scott, Knock, James, Drummond, Andrew, Ramsden, Fiona, Kubisz-Pudelko, Agnieszka, Walker, James, Moppett, Iain, White, Louise, Jackson, Matthew, Reschreiter, Henrik, Innes, Richard, Chew, Michelle, Kalman, Sigridur, Wallden, Jakob, Schening, Anna, Jonikaite, Lina, Enlund, Anna, De Baerdemaeker, Luc, Morrison, Stuart, Rex, Steffen, Alexis, Alexandros, Khoronenko, Viktoria E., Belskii, Vladislav, Kaznacheeva, Kseniya, Gritsan, Alexey, Yeoh, Cindy B., Malinovska-Nikolovska, Liljana, Golubović, Mladjan, Kotzinger, Oskar, Des Deserts, Marc Danguy, Ducrocq, Nicolas, Bonnet, Jean François, Cusack, Barbara, Nallbani, Rajmonda, Daamen, Sylvia, Plichon, Benoit, Harlet, Pierre, Farsi, Slama, Sepehr, Saman Homayun, Espinosa, David, Lurati Buse, Giovanna A., Mauermann, Eckhard, Filipovic, Miodrag, Beck-Schimmer, Beatrice, Gillmann, Hans-Jörg, Guzzetti, Luca, Kotfis, Katarzyna, Wulf, Hinnerk, Larmann, Jan, Corneci, Dan, and Chammartin-Basnet, Frederique

Published
2023
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115. All-Sky Measurement of the Anisotropy of Cosmic Rays at 10 TeV and Mapping of the Local Interstellar Magnetic Field

Author

HAWC Collaboration, Abeysekara, A. U., Alfaro, R., Alvarez, C., Álvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., Rojas, D. Avila, Belmont-Moreno, E., BenZvi, S. Y., Brisbois, C., Capistrán, T., Carramiñana, A., Casanova, S., Cotti, U., Cotzomi, J., Díaz-Vélez, J. C., De León, C., De la Fuente, E., Dichiara, S., DuVernois, M. A., Espinoza, C., Fiorino, D. W., Fleischhack, H., Fraija, N., Galván-Gámez, A., García-González, J. A., González, M. M., Goodman, J. A., Hampel-Arias, Z., Harding, J. P., Hernandez, S., Hona, B., Hueyotl-Zahuantitla, F., Iriarte, A., Jardin-Blicq, A., Joshi, V., Lara, A., Vargas, H. León, Luis-Raya, G., Malone, K., Marinelli, S. S., Martínez-Castro, J., Martinez, O., Matthews, J. A., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Pérez-Pérez, E. G., Pretz, J., Ren, Z., Rho, C. D., Rivière, C., Rosa-González, D., Rosenberg, M., Salazar, H., Greus, F. Salesa, Sandoval, A., Schneider, M., Schoorlemmer, H., Sinnis, G., Smith, A. J., Surajbali, P., Taboada, I., Tollefson, K., Torres, I., Villaseño, L., Weisgarber, T., Wood, J., Zepeda, A., Zhou, H., Collaboration, IceCube, Aartsen, M. G., Ackermann, M., Adams, J., Aguilar, J. A., Ahlers, M., Ahrens, M., Altmann, D., Andeen, K., Anderson, T., Ansseau, I., Anton, G., Argüelles, C., Auffenberg, J., Axani, S., Backes, P., Bagherpour, H., Bai, X., Barbano, A., Barron, J. P., Barwick, S. W., Baum, V., Bay, R., Beatty, J. J., Becker, K. -H., Tjus, J. Becker, BenZvi, S., Berley, D., Bernardini, E., Besson, D. Z., Binder, G., Bindig, D., Blaufuss, E., Blot, S., Bohm, C., Börner, M., Bos, F., Böser, S., Botner, O., Bourbeau, E., Bourbeau, J., Bradascio, F., Braun, J., Bretz, H. -P., Bron, S., Brostean-Kaiser, J., Burgman, A., Busse, R. S., Carver, T., Chen, C., Cheung, E., Chirkin, D., Clark, K., Classen, L., Collin, G. H., Conrad, J. M., Coppin, P., Correa, P., Cowen, D. F., Cross, R., Dave, P., Day, M., de André, J. P. A. M., De Clercq, C., DeLaunay, J. J., Dembinski, H., Deoskar, K., De Ridder, S., Desiati, P., de Vries, K. D., de Wasseige, G., de With, M., DeYoung, T., Dujmovic, H., Dunkman, M., Dvorak, E., Eberhardt, B., Ehrhardt, T., Eichmann, B., Eller, P., Evenson, P. A., Fahey, S., Fazely, A. R., Felde, J., Filimonov, K., Finley, C., Franckowiak, A., Friedman, E., Fritz, A., Gaisser, T. K., Gallagher, J., Ganster, E., Garrappa, S., Gerhardt, L., Ghorbani, K., Giang, W., Glauch, T., Glüsenkamp, T., Goldschmidt, A., Gonzalez, J. G., Grant, D., Griffith, Z., Haack, C., Hallgren, A., Halve, L., Halzen, F., Hanson, K., Hebecker, D., Heereman, D., Helbing, K., Hellauer, R., Hickford, S., Hignight, J., Hill, G. C., Hoffman, K. D., Hoffmann, R., Hoinka, T., Hokanson-Fasig, B., Hoshina, K., Huang, F., Huber, M., Hultqvist, K., Hünnefeld, M., Hussain, R., In, S., Iovine, N., Ishihara, A., Jacobi, E., Japaridze, G. S., Jeong, M., Jero, K., Jones, B. J. P., Kalaczynski, P., Kang, W., Kappes, A., Kappesser, D., Karg, T., Karle, A., Katz, U., Kauer, M., Keivani, A., Kelley, J. L., Kheirandish, A., Kim, J., Kintscher, T., Kiryluk, J., Kittler, T., Klein, S. R., Koirala, R., Kolanoski, H., Köpke, L., Kopper, C., Kopper, S., Koskinen, D. J., Kowalski, M., Krings, K., Kroll, M., Krückl, G., Kunwar, S., Kurahashi, N., Kyriacou, A., Labare, M., Lanfranchi, J. L., Larson, M. J., Lauber, F., Leonard, K., Leuermann, M., Liu, Q. R., Lohfink, E., Mariscal, C. J. Lozano, Lu, L., Lünemann, J., Luszczak, W., Madsen, J., Maggi, G., Mahn, K. B. M., Makino, Y., Mancina, S., Mariş, I. C., Maruyama, R., Mase, K., Maunu, R., Meagher, K., Medici, M., Medina, A., Meier, M., Menne, T., Merino, G., Meures, T., Miarecki, S., Micallef, J., Momenté, G., Montaruli, T., Moore, R. W., Moulai, M., Nagai, R., Nahnhauer, R., Nakarmi, P., Naumann, U., Neer, G., Niederhausen, H., Nowicki, S. C., Nygren, D. R., Pollmann, A. Obertacke, Olivas, A., O'Murchadha, A., O'Sullivan, E., Palczewski, T., Pandya, H., Pankova, D. V., Peiffer, P., Heros, C. Pérez de los, Pieloth, D., Pinat, E., Pizzuto, A., Plum, M., Price, P. B., Przybylski, G. T., Raab, C., Raissi, A., Rameez, M., Rauch, L., Rawlins, K., Rea, I. C., Reimann, R., Relethford, B., Renzi, G., Resconi, E., Rhode, W., Richman, M., Robertson, S., Rongen, M., Rott, C., Ruhe, T., Ryckbosch, D., Rysewyk, D., Safa, I., Herrera, S. E. Sanchez, Sandrock, A., Sandroos, J., Santander, M., Sarkar, S., Satalecka, K., Schaufel, M., Schlunder, P., Schmidt, T., Schneider, A., Schneider, J., Schöneberg, S., Schumacher, L., Sclafani, S., Seckel, D., Seunarine, S., Soedingrekso, J., Soldin, D., Song, M., Spiczak, G. M., Spiering, C., Stachurska, J., Stamatikos, M., Stanev, T., Stasik, A., Stein, R., Stettner, J., Steuer, A., Stezelberger, T., Stokstad, R. G., Stößl, A., Strotjohann, N. L., Stuttard, T., Sullivan, G. W., Sutherland, M., Tenholt, F., Ter-Antonyan, S., Terliuk, A., Tilav, S., Tobin, M. N., Tönnis, C., Toscano, S., Tosi, D., Tselengidou, M., Tung, C. F., Turcati, A., Turcotte, R., Turley, C. F., Ty, B., Unger, E., Elorrieta, M. A. Unland, Usner, M., Vandenbroucke, J., Van Driessche, W., van Eijk, D., van Eijndhoven, N., Vanheule, S., van Santen, J., Vraeghe, M., Walck, C., Wallace, A., Wallraff, M., Wandkowsky, N., Wandler, F. D., Watson, T. B., Weaver, C., Weiss, M. J., Weldert, J., Wendt, C., Werthebach, J., Westerhoff, S., Whelan, B. J., Whitehorn, N., Wiebe, K., Wiebusch, C. H., Wille, L., Williams, D. R., Wills, L., Wolf, M., Wood, T. R., Woolsey, E., Woschnagg, K., Wrede, G., Xu, D. L., Xu, X. W., Xu, Y., Yanez, J. P., Yodh, G., Yoshida, S., and Yuan, T.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

We present the first full-sky analysis of the cosmic ray arrival direction distribution with data collected by the HAWC and IceCube observatories in the Northern and Southern hemispheres at the same median primary particle energy of 10 TeV. The combined sky map and angular power spectrum largely eliminate biases that result from partial sky coverage and holds a key to probe into the propagation properties of TeV cosmic rays through our local interstellar medium and the interaction between the interstellar and heliospheric magnetic fields. From the map we determine the horizontal dipole components of the anisotropy $\delta_{0h} = 9.16 \times 10^{-4}$ and $\delta_{6h} = 7.25 \times 10^{-4}~(\pm0.04 \times 10^{-4})$. In addition, we infer the direction ($229.2\pm 3.5^\circ$ RA , $11.4\pm 3.0^\circ$ Dec.) of the interstellar magnetic field from the boundary between large scale excess and deficit regions from which we estimate the missing corresponding vertical dipole component of the large scale anisotropy to be $\delta_N \sim -3.97 ^{+1.0}_{-2.0} \times 10^{-4}$., Comment: Accepted by The Astrophysical Journal

Published
2018
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116. Rationale and design of the colchicine for the prevention of perioperative atrial fibrillation in patients undergoing major noncardiac thoracic surgery (COP-AF) trial

Author

Devereaux, Vincent, Jessica, Wang, Michael Ke, Wells, Jennifer R., Conen, David, Devereaux, PJ, Healey, Jeff S., Landoni, Giovanni, McIntyre, William F., Popova, Ekaterine, Sessler, Daniel I., Srinathan, Sadeesh K., Amir, Mohammed, Bangdiwala, Shrikant I., Bossard, Matthias, Chan, Matthew T.V., Eikelboom, John W., Fleischmann, Edith, Jolly, Sanjit S., Montes, Felix Ramón, Reimer, Cara, Schmartz, Denis, Wang, Chew Yin, Alvarez-Garcia, Jesus, Bianco, Giuliana Lo, Blum, Steffen, Boasquevisque, Danielle de Sa, Borges, Flavia K., Chiarella-Redfern, Helene, Gonzalez-Osuna, Aranzazu, Guerra-Ramos, Jose M., Marcucci, Maura, Meyre, Pascal B., Ofori, Sandra N., Oleynick, Christopher, Ramos-Pachón, Anna, Traquair, Hugh, Mitchell, L. Brent, Wyse, George, Cheng, Davy, McAlister, Finlay A., Wells, George A., Baskaran, Geethan, Gennaccaro, Julia, Howe, Rosemary, Mastrangelo, Louise, Pettit, Shirley, Shahbaz, Subana, Tosh, Makayla, Zucchetto, Simona J., Heenan, Laura, Lee, Shun Fu, Li, Zhuoru, Xu, Lizhen, Kabon, Barbara, Reiterer, Christian, Taschner, Alexander, Horvath, Katharina, Adamowitsch, Nikolas, Zotti, Oliver, Hantáková, Nicole, Hochreiter, Beatrix, Huybrechts, Isabelle, Cappeliez, Serge, Neary, John D., Shargall, Yaron, Tandon, Vikas, Finley, Christian, Agzarian, John, Hanna, Waël, Abdulrahman, Muammar, Lawrence, Kelly, Gregus, Krysten, Quraishi, Faraaz, Wikkerink, Spencer, Wallace, Christine, Prine, Merissa, Gregus, Emily, Hare, Jacqueline, Lombardo, Kristen, Fezia, Behashta, Columbus, Teresa, DuMerton, Deborah, Reid, Ken, Parlow, Joel, Chung, Wiley, Karizhenskaia, Maria, Malik, Aftab, Kidane, Biniam, Liu, Richard, Tan, Lawrence, Gowing, Stephen, Buduhan, Gordon, Enns, Stephanie, Poole, Emma, Graham, Kristin, McLean, Sean R., McGuire, Anna, Lohser, Jens, Lim, Shirley, Grey, Rebecca, Grant, Kyle, Lee, Alex L., Choi, James J., Dewar, Leith R., Yee, John, Maziak, Donna E., Seely, Andrew J.E., Gilbert, Sebastien, Villeneuve, P. James, Sundaresan, Sudhir, Moffatt-Bruce, Susan D., Gingrich, Molly, Fazekas, Anna, Bucciero, Kirby, Malthaner, Richard A., Lewis, Deb, Fortin, Dalilah, Qiabi, Mehdi, Nayak, Rahul, Plourde, Madelaine Marie, Sellers, Daniel, Donahoe, Laura, Lefebvre, Marco, Lanthier, Luc, Schieman, Colin, Bessissow, Amal, Joynt, Gavin M., Wong, Randolph H.L., Lau, Rainbow W.H., Wong, Wai Tat, Choi, Gordon Y.S., Lee, Eva, Hui, Ka Yan, Fung, Beaker, Chan, Chee Sam, Gutiérrez-Soriano, Laura, Castañeda, Laura Carmenza, Téllez, Luis Jaime, Ortiz-Ramirez, Lina Marcela, De Santis, Simona, Favaro, Giovanni, Muriana, Piergiorgio, Nakhnoukh, Cristina, Novellis, Pierluigi, Turi, Stefano, Veronesi, Giulia, Angelini, Matteo, Voltolini, Luca, Bongiolatti, Stefano, Salvicchi, Alberto, Gatteschi, Lavinia, Indino, Rossella, Tombelli, Simone, Ravasin, Alice, Salimbene, Ottavia, Rosboch, Giulio Luca, Balzani, Eleonora, Massullo, Domenico, Fiorelli, Silvia, Londero, Francesco, Grossi, William, Ng, Tyng Yan, See, Woan Shiang, Nawaz, Mohammed Asghar, Reyes, Juan Carlos Trujillo, Tellez, Elisabeth Martinez, Sanchis, Josep Belda, Cánovas, Georgina Planas, Ruiz, Ana Parera, Gutierrez, Esther Cladellas, Guarino, Mauro, Cuchi, Gerard Urrutia, Nogues, Marta Argilaga, Juan, Anna Rovira, Medina-Aedo, Melixa, Grande, Ascensión Martín, Roux, Diego Parise, Martín, Luis Gajate, Pajares, Angélica De Pablo, Toha, Angel Manuel Candela, Mata, Nicolás Moreno, Molina, Gema Muñoz, Silva, Usue Caballero, Cabañero, Alberto, Fernandez, Sara Fra, Tallada, Anna Gonzàlez, Suarez, Susana González, Ball, Montserrat Ribas, Clanchet, Miriam De Nadal, Ruiz-Villa, Laura, Martí-Ejarque, M.M., Gili-Bueno, Mireia, Ferrández, Jorge Hernández, Llobet, Neus Pons, Cruz, Patricia, Sánchez-Pedrosa, Guillermo, Duque, Patricia, Azcárate, Leire, Martín-Albo, Lorena, Rodríguez-Fuster, Alberto, Bermejo-Martínez, Silvia, Carramiñana, Albert, Minervini, Fabrizio, Cata, Juan P., Rajaram, Ravi, Corrales, German, Guerra-Londono, Juan Jose, Mehran, Reza, Sepesi, Boris, Walsh, Garrett, Cukierman, Daniel S., Marchant, Bryan E., Harris, Lynne C., Cusson, Bruce D., Miller, Scott A., Minear, Steven C., Teixeira, Camila, Pimentel, Mario, Popoff, Andrew M., Cheung, Wing Lee, Marsack, Kelly, Ayad, Sabry, Araujo, Jorge, Chen, Tzonghuei H., Essandoh, Michael, Poppers, Jeremy S., Trujillo Reyes, Juan Carlos, Gonzalez Tallada, Anna, and Garg, Amit X.

Published
2023
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120. In-hospital and 6-month outcomes in patients with COVID-19 supported with extracorporeal membrane oxygenation (EuroECMO-COVID): a multicentre, prospective observational study

Author

Lorusso, Roberto, De Piero, Maria Elena, Mariani, Silvia, Di Mauro, Michele, Folliguet, Thierry, Taccone, Fabio Silvio, Camporota, Luigi, Swol, Justyna, Wiedemann, Dominik, Belliato, Mirko, Broman, Lars Mikael, Vuylsteke, Alain, Kassif, Yigal, Scandroglio, Anna Mara, Fanelli, Vito, Gaudard, Philippe, Ledot, Stephane, Barker, Julian, Boeken, Udo, Maier, Sven, Kersten, Alexander, Meyns, Bart, Pozzi, Matteo, Pedersen, Finn M, Schellongowski, Peter, Kirali, Kaan, Barrett, Nicholas, Riera, Jordi, Mueller, Thomas, Belohlavek, Jan, Lo Coco, Valeria, Van der Horst, Iwan C C, Van Bussel, Bas C T, Schnabel, Ronny M, Delnoij, Thijs, Bolotin, Gil, Lorini, Luca, Schmiady, Martin O, Schibilsky, David, Kowalewski, Mariusz, Pinto, Luis F, Silva, Pedro E, Kornilov, Igor, Blandino Ortiz, Aaron, Vercaemst, Leen, Finney, Simon, Roeleveld, Peter P, Di Nardo, Matteo, Hennig, Felix, Antonini, Marta Velia, Davidson, Mark, Jones, Tim J, Staudinger, Thomas, Mair, Peter, Kilo, Juliane, Krapf, Christoph, Erbert, Kathrin, Peer, Andreas, Bonaros, Nikolaos, Kotheletner, Florian, Krenner Mag, Niklas, Shestakova, Liana, Hermans, Greet, Dauwe, Dieter, Meersseman, Philippe, Stockman, Bernard, Nobile, Leda, Lhereux, Olivier, Nrasseurs, Alexandre, Creuter, Jacques, De Backer, Daniel, Giglioli, Simone, Michiels, Gregoire, Foulon, Pierre, Raes, Matthias, Rodrigus, Inez, Allegaert, Matthias, Jorens, Philippe, Debeucklare, Gerd, Piagnerelli, Michael, Biston, Patrick, Peperstraete, Harlinde, Vandewiele, Komeel, Germay, Olivier, Vandeweghe, Dimitri, Havrin, Sven, Bourgeois, Marc, Lagny, Marc-Gilbert, Alois, Genette, Lavios, Nathalie, Misset, Benoit, Courcelle, Romain, Timmermans, Philippe J, Yilmaz, Alaaddin, Vantomout, Michiel, Lehaen, Jerone, Jassen, Ame, Guterman, Herbert, Strauven, Maarten, Lormans, Piet, Verhamme, Bruno, Vandewaeter, catherine, Bonte, Frederik, Vionne, Dominique, Balik, Martin, Blàha, Jan, Lips, Michal, Othal, Michal, Bursa, Filip, Spacek, Radim, Christensen, Steffen, Jorgensen, Vibeke, Sorensen, Marc, Madsen, Soren A, Puss, Severin, Beljantsev, Aleksandr, Saiydoun, gabriel, Fiore, Antonio, Colson, Pascal, Bazalgette, Florian, Capdevila, Xavier, Kollen, Sebastien, Muller, Laurent, Obadia, Jean-Francois, Dubien, Pierre-Yves, Ajrhourh, Lucrezia, Guinot, Pierre G, Zarka, Jonathan, Besserve, Patricia, Malfertheiner, Maximilian V, Dreier, Esther, Heinze, Birgit, Akhyari, Payam, Lichtenberg, Artur, Aubin, Hug, Assman, Alexander, Saeed, Diyar, Thiele, Holger, Baumgaertel, Matthias, Schmitto, Jan D, Ruslan, Natanov, Haverich, Axel, Thielmann, Matthias, Brenner, Thorsten, Ruhpawar, Arjang, Benk, Christoph, Czerny, Martin, Staudacher, Dawid L, Beyersdorf, Fridhelm, Kalbhenn, Johannes, Henn, Philipp, Popov, Aron-Frederik, Iuliu, Torje, Muellenbach, Ralf, Reyher, Christian, Rolfes, Caroline, Lotz, Gosta, Sonntagbauer, Michael, Winkels, Helen, Fichte, Julia, Stohr, Robert, Kalverkamp, Sebastian, Karagiannidis, Christian, Schafer, Simone, Svetlitchny, Alexei, Hopf, Hans-Bernd, Jarczak, Dominik, Groesdonk, Heinirich, Rommer, Magdalena, Hirsch, Jan, Kaehny, Christian, Soufleris, Dimitros, Gavriilidis, Georgios, Pontikis, Kostantinos, Kyriakopoulou, Magdalini, Kyriakoudi, Anna, O'Brien, Serena, Conrick-Martin, Ian, Carton, Edmund, Makhoul, Maged, Ben-Ari, Josef, Hadash, Amir, Kogan, Alexander, Kassif Lerner, Reut, Abu-Shakra, Anas, Matan, Moshe, Balawona, Ahmad, Kachel, Erez, Altshuler, Roman, Galante, Ori, Fuchs, Lior, Almog, Yaniv, Ishay, Yaron S, Lichter, Yael, Gal-oz, Amir, Carmi, Uri, Nini, Asaph, Soroksky, Arie, Dekel, Hagi, Rozman, Ziv, Tayem, Emad, Ilgiyaev, Eduard, Hochman, Yuval, Miltau, daniel, Rapoport, Avigal, Eden, Arieh, Kompanietz, Dmitry, Yousif, Michael, Golos, Miri, Grazioli, Lorenzo, Ghitti, Davide, Loforte, Antonio, Di Luca, Daniela, Baiocchi, Massimo, Pacini, Davide, Cappai, Antioco, Meani, Paolo, Mondino, Michele, Russo, Claudio F, Ranucci, Marco, Fina, Dario, Cotza, Marco, Ballotta, Andrea, Landoni, Giovanni, Nardelli, Pasquale, Fominski, Eygeny V, Brazzi, Luca, Montrucchio, Giorgia, Sales, Gabriele, Simonetti, Umberto, Livigni, Sergio, Silengo, Daniela, Arena, Giulia, Sovatzis, Stefania S, Degani, Antonella, Riccardi, Mariachiara, Milanesi, Elisa, Raffa, Giuseppe, Martucci, Gennaro, Arcadipane, Antonio, Panarello, Giovanna, Chiarini, Giovanni, Cattaneo, Sergio, Puglia, Carmine, Benussi, Stefano, Foti, Giuseppe, Giani, Marco, Bombino, Michela, Costa, Maria Cristina, Rona, Roberto, Avalli, Leonello, Donati, Abele, Carozza, Roberto, Gasparri, Francesco, Carsetti, Andrea, Picichè, Marco, Marinello, Anna, Danzi, Vinicio, Zanin, Anita, Condello, Ignazio, Fiore, Flavio, Moscarelli, Marco, Nasso, Giuseppe, Speziale, Giuseppe, Sandrelli, Luca, Montalto, Andrea, Musumeci, Francesco, Circelli, Alessandro, Russo, Emanuele, Agnoletti, Vanni, Rociola, Ruggero, Milano, Aldo D, Pilato, Emanuele, Comentale, Giuseppe, Montisci, Andrea, Alessandri, Francesco, Tosi, Antonella, Pugliese, Francesco, Giordano, Giovanni, Carelli, Simone, Grieco, Domenico L, Dell'Anna, Antonio M, Antonelli, Massimo, Ramoni, Enrico, Zulueta, Josè, Del Giglio, Mauro, Petracca, Sebastiano, Bertini, Pietro, Guarracino, Fabio, De Simone, Luigi, Angeletti, Paolo M, Forfori, Francesco, Taraschi, Francesco, Quintiliani, Veronica N, Samalavicius, Robertas, Jankuviene, Agne, Scupakova, Nadezda, Urbonas, Karolis, Kapturauskas, Juozas, Soerensen, Gro, Suwalski, Piotr, Linhares Santos, Luis, Marques, Ana, Miranda, Marisa, Teixeira, Sonia, Salgueiro, Andrea, Pereira, Filipe, Ketskalo, Michail, Tsarenko, Sergey, Shilova, Alexandra, Afukov, Ivan, Popugaev, Konstantin, Minin, Sergei, Shelukhin, Daniil, Malceva, Olga, Gleb, Moroz, Skopets, Alexander, Kornelyuk, Roman, Kulikov, Alexandr, Okhrimchuk, Vadim, Turchaninov, Alexandr, Petrushin, Maxim, Sheck, Anastasia, Mekulov, Akhmed, Ciryateva, Svetlana, Urusov, Dmitry, Gorjup, Vojka, Golicnik, Alenka, Goslar, Tomaz, Ferrer, Ricard, Martinez-Martinez, Maria, Argudo, Eduard, Palmer, Neiser, De Pablo Sanchez, Raul, Juan Higuera, Lucas, Arnau Blasco, Lucas, Marquez, Josè A, Sbraga, Fabrizio, Fuset, Mari Paz, De Gopegui, Pablo Ruiz, Claraco, Luis M, De Ayala, Josè A, Peiro, Maranta, Ricart, Pilar, Martinez, Sergio, Chavez, Fernando, Fabra, Marc, Sandoval, elena, Toapanta, David, Carraminana, Albert, Tellez, Adrian, Ososio, Jeysson, Milan, Pablo, Rodriguez, Jorge, Andoni, Garcia, Gutierrez, Carola, Perez de la Sota, Enrique, Eixeres-Esteve, Andrea, Garcia-Maellas, Maria Teresa, Gutierrez-Gutierrez, Judit, Arboleda-Salazar, Rafael, Santa Teresa, Patricia, Jaspe, Alexis, Garrido, Alberto, Castaneda, Galo, Alcantara, Sara, Martinez, Nuria, Perez, Marina, Villanueva, Hector, Vidal Gonzalez, Anxela, Paez, Juan, Santon, Arnoldo, Perez, Cesar, Lopez, Marta, Rubio Lopez, Maria Isabel, Gordillo, Antonio, Naranjo-Izurieta, Jose, Munoz, Javier, Alcalde, Immaculada, Onieva, Fernando, Gimeno Costa, Ricardo, Perez, Francisco, Madrid, Isabel, Gordon, Monica, Albacete Moreno, Carlos L, Perez, Daniel, Lopez, Nayara, Martinenz, Domingo, Blanco-Schweizer, Pablo, Diez, Cristina, Perez, David, Prieto, Ana, Renedo, Gloria, Bustamante, Elena, Cicuendez, Ramon, Citores, Rafael, Boado, Victoria, Garcia, Katherine, Voces, Roberto, Domezain, Monica, Nunez Martinez, Jose Maria, Vicente, Raimundo, Martin, David, Andreu, Antonio, Gomez Casal, Vanesa, Chico, Ignacio, Menor, Eva Maria, Vara, Sabela, Gamacho, Jose, Perez-Chomon, Helen, Javier Gonzales, Francisco, Barrero, Irene, Martin-Villen, Luis, Fernandez, Esperanza, Mendoza, Maria, Navarro, Joaquin, Colomina Climent, Joaquin, Gonzales-Perez, Alfredo, Muniz-Albaceita, Guillermo, Amado, Laura, Rodriguez, Raquel, Ruiz, Emilio, Eiras, Maria, Grins, Edgars, Magnus, Rosen, Kanetoft, Mikael, Eidevald, Marcus, Watson, Pia, Vogt, Paul R, Steiger, Peter, Aigner, Tobias, Weber, Alberto, Grunefelder, Jurg, Kunz, Martin, Grapow, Martin, Aymard, Thierry, Reser, Diana, Agus, Gianluca, Consiglio, Jolanda, Haenggi, Matthias, Hansjoerg, Jenni, Iten, Manuela, Doeble, Thomas, Zenklusen, Urs, Bechtold, Xavier, Faedda, Giovanni, Iafrate, Manuel, Rohjer, Amanda, Bergamaschi, Layla, Maessen, Jos, Reis Miranda, Dinis, Endeman, H, Gommers, D, Meuwese, C, Maas, Jacinta, Van Gijlswijk, MJ, Van Berg, RN, Candura, Dario, Van der Linden, Marcel, Kant, Merijin, Van der Heijden, JJ, Scholten, Eric, Van Belle-van Haren, Nicole, Lagrand, WK, Vlaar, Alexander P, De Jong, Syste, Cander, Basar, Sargin, Murat, Ugur, Murat, Kaygin, Mehmet A, Daly, Kathleen, Agnew, Nicola, Head, Laura, Kelly, Laura, Anoma, Gunawardena, Russell, Clare, Aquino, Verna, Scott, Ian, Flemming, Lucy, Gillon, Stuart, Moore, Olivia, Gelandt, Elton, Auzinger, George, Patel, Sameer, and Loveridge, Robert

Published
2023
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123. Searching for Dark Matter Sub-structure with HAWC

Author

Abeysekara, A. U., Albert, A., Alfaro, R., Alvarez, C., Arceo, R., Arteaga-Velázquez, J. C., Rojas, D. Avila, Solares, H. A. Ayala, Belmont-Moreno, E., BenZvi, S. Y., Brisbois, C., Caballero-Mora, K. S., Carramiñana, A., Casanova, S., Cotzomi, J., de León, S. Coutiño, De León, C., De la Fuente, E., Dichiara, S., Dingus, B. L., DuVernois, M. A., Díaz-Vélez, J. C., Engel, K., Espinoza, C., Fleischhack, H., Fraija, N., Galván-Gámez, A., García-González, J. A., González, M. M., Goodman, J. A., Harding, J. P., Hona, B., Hueyotl-Zahuantitla, F., Hüntemeyer, P., Iriarte, A., Lara, A., Lee, W. H., Vargas, H. León, Linnemann, J. T., Longinotti, A. L., Luis-Raya, G., Lundeen, J., Malone, K., Marinelli, S. S., Martinez, O., Martinez-Castellanos, I., Martínez-Castro, J., Matthews, J. A., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nayerhoda, A., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Pérez-Pérez, E. G., Ren, Z., Rho, C. D., Rivière, C., Rosa-González, D., Rosenberg, M., Salazar, H., Greus, F. Salesa, Sandoval, A., Schneider, M., Sinnis, G., Smith, A. J., Springer, R. W., Tollefson, K., Torres, I., Vianello, G., Weisgarber, T., Wood, J., Yapici, T., Zepeda, A., Zhou, H., and Álvarez, J. D.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

Simulations of dark matter show a discrepancy between the expected number of Galactic dark matter sub-halos and how many have been optically observed. Some of these unseen satellites may exist as dark dwarf galaxies: sub-halos like dwarf galaxies with no luminous counterpart. Assuming WIMP dark matter, it may be possible to detect these unseen sub-halos from gamma-ray signals originating from dark matter annihilation. The High Altitude Water Cherenkov Observatory (HAWC) is a very high energy (500 GeV to 100 TeV) gamma ray detector with a wide field-of-view and near continuous duty cycle, making HAWC ideal for unbiased sky surveys. We perform such a search for gamma ray signals from dark dwarfs in the Milky Way halo. We perform a targeted search of HAWC gamma-ray sources which have no known association with lower-energy counterparts, based on an unbiased search of the entire sky. With no sources found to strongly prefer dark matter models, we calculate the ability of HAWC to observe dark dwarfs. We also compute the HAWC sensitivity to potential future detections for a given model of dark matter substructure., Comment: 20 pages, 10 figures. submitted to JCAP

Published
2018
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124. New GTC Spectroscopic Data and a Statistical Study to Better Constrain the Redshift of the BL Lac RGB J2243+203

Author

González, D. Rosa, Muriel, H., Mayya, Y. D., Aretxaga, I., González, J. Becerra, Carramiñana, A., Méndez-Abreu, J., Vega, O., Terlevich, E., de León, S. Coutiño, Furniss, A., Longinotti, A. L., Terlevich, R. J., Pichel, A. C., Rovero, A. C., and Donzelli, C.

Subjects
Astrophysics - Astrophysics of Galaxies
Abstract

We present new spectroscopic data of the BL Lac RGB 2243+203, and its surroundings, obtained with the OSIRIS Multi Object Spectrograph (MOS) mounted in the Gran Telescopio Canarias (GTC). The spectra of neither the BL Lac nor its host galaxy show any spectral feature, thus hindering direct determination of its redshift. The spectroscopic redshift distribution of objects in the MOS field of view shows four galaxies with redshift between 0.5258 and 0.5288. We make use of a statistical analysis to test the possibility that the targeted BL Lac may be a member of that group. By using the spectroscopic redshifts obtained with our GTC observations, we found that this probability is between 86% and 93%., Comment: Manuscript accepted for publication in MNRAS on 7 November 2018. arXiv admin note: substantial text overlap with arXiv:1611.10262

Published
2018
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125. Early Science with the Large Millimeter Telescope: an energy-driven wind revealed by massive molecular and fast X-ray outflows in the Seyfert Galaxy IRAS 17020+4544

Author

Longinotti, A. L., Vega, O., Krongold, Y., Aretxaga, I., Yun, M., Chavushyan, V., Feruglio, C., Gomez-Ruiz, A., Montaña, A., Leon-Tavares, J., Olguın-Iglesias, A., Giroletti, M., Guainazzi, M., Kotilainen, J., Panessa, F., Zapata, L. A., Cruz-Gonzalez, I., Patiño-Alvarez, V. M., Rosa-Gonzalez, D., Carramiñana, A., Carrasco, L., Costantini, E., Dultzin, D., Guichard, J., Puerari, I., and Santos-Lleo, M.

Subjects
Astrophysics - Astrophysics of Galaxies
Abstract

We report on the coexistence of powerful gas outflows observed in millimeter and X-ray data of the Radio-Loud Narrow Line Seyfert 1 Galaxy IRAS 17020+4544. Thanks to the large collecting power of the Large Millimeter Telescope, a prominent line arising from the 12CO(1-0) transition was revealed in recent observations of this source. The complex profile is composed by a narrow double-peak line and a broad wing. While the double-peak structure may be arising in a disk of molecular material, the broad wing is interpreted as the signature of a massive outflow of molecular gas with an approximate bulk velocity of -660 km/s. This molecular wind is likely associated to a multi-component X-ray Ultra-Fast Outflow with velocities reaching up to ~0.1c and column densities in the range 10^{21-23.9} cm^-2 that was reported in the source prior to the LMT observations. The momentum load estimated in the two gas phases indicates that within the observational uncertainties the outflow is consistent with being propagating through the galaxy and sweeping up the gas while conserving its energy. This scenario, which has been often postulated as a viable mechanism of how AGN feedback takes place, has so far been observed only in ULIRGs sources. IRAS 17020+4544 with bolometric and infrared luminosity respectively of 5X10^{44} erg/s and 1.05X10^{11} L_sun appears to be an example of AGN feedback in a NLSy1 Galaxy (a low power AGN). New proprietary multi-wavelength data recently obtained on this source will allow us to corroborate the proposed hypothesis., Comment: Accepted for publication on ApJ Letters, 9 pages, 4 figures

Published
2018
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126. Very high energy particle acceleration powered by the jets of the microquasar SS 433

Author

HAWC Collaboration, Abeysekara, A. U., Albert, A., Alfaro, R., Alvarez, C., Álvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., Rojas, D. Avila, Solares, H. A. Ayala, Belmont-Moreno, E., BenZvi, S. Y., Brisbois, C., Caballero-Mora, K. S., Capistrán, T., Carramiñana, A., Casanova, S., Castillo, M., Cotti, U., Cotzomi, J., de León, S. Coutiño, De León, C., De la Fuente, E., Díaz-Vélez, J. C., Dichiara, S., Dingus, B. L., DuVernois, M. A., Ellsworth, R. W., Engel, K., Espinoza, C., Fang, K., Fleischhack, H., Fraija, N., Galván-Gámez, A., García-González, J. A., Garfias, F., Muñoz, A. González, González, M. M., Goodman, J. A., Hampel-Arias, Z., Harding, J. P., Hernandez, S., Hinton, J., Hona, B., Hueyotl-Zahuantitla, F., Hui, C. M., Hüntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kaufmann, S., Kar, P., Kunde, G. J., Lauer, R. J., Lee, W. H., Vargas, H. León, Li, H., Linnemann, J. T., Longinotti, A. L., Luis-Raya, G., López-Coto, R., Malone, K., Marinelli, S. S., Martinez, O., Martinez-Castellanos, I., Martínez-Castro, J., Matthews, J. A., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nayerhoda, A., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Pérez-Pérez, E. G., Pretz, J., Ren, Z., Rho, C. D., Rivière, C., Rosa-González, D., Rosenberg, M., Ruiz-Velasco, E., Greus, F. Salesa, Sandoval, A., Schneider, M., Schoorlemmer, H., Arroyo, M. Seglar, Sinnis, G., Smith, A. J., Springer, R. W., Surajbali, P., Taboada, I., Tibolla, O., Tollefson, K., Torres, I., Vianello, G., Villaseñor, L., Weisgarber, T., Werner, F., Westerhoff, S., Wood, J., Yapici, T., Yodh, G., Zepeda, A., Zhang, H., and Zhou, H.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

SS 433 is a binary system containing a supergiant star that is overflowing its Roche lobe with matter accreting onto a compact object (either a black hole or neutron star). Two jets of ionized matter with a bulk velocity of $\sim0.26c$ extend from the binary, perpendicular to the line of sight, and terminate inside W50, a supernova remnant that is being distorted by the jets. SS 433 differs from other microquasars in that the accretion is believed to be super-Eddington, and the luminosity of the system is $\sim10^{40}$ erg s$^{-1}$. The lobes of W50 in which the jets terminate, about 40 pc from the central source, are expected to accelerate charged particles, and indeed radio and X-ray emission consistent with electron synchrotron emission in a magnetic field have been observed. At higher energies (>100 GeV), the particle fluxes of $\gamma$ rays from X-ray hotspots around SS 433 have been reported as flux upper limits. In this energy regime, it has been unclear whether the emission is dominated by electrons that are interacting with photons from the cosmic microwave background through inverse-Compton scattering or by protons interacting with the ambient gas. Here we report TeV $\gamma$-ray observations of the SS 433/W50 system where the lobes are spatially resolved. The TeV emission is localized to structures in the lobes, far from the center of the system where the jets are formed. We have measured photon energies of at least 25 TeV, and these are certainly not Doppler boosted, because of the viewing geometry. We conclude that the emission from radio to TeV energies is consistent with a single population of electrons with energies extending to at least hundreds of TeV in a magnetic field of $\sim16$~micro-Gauss., Comment: Preprint version of Nature paper. Contacts: S. BenZvi, B. Dingus, K. Fang, C.D. Rho , H. Zhang, H. Zhou

Published
2018
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127. VERITAS and Fermi-LAT observations of new HAWC sources

Author

VERITAS Collaboration, Abeysekara, A. U., Archer, A., Benbow, W., Bird, R., Brose, R., Buchovecky, M., Buckley, J. H., Bugaev, V., Chromey, A. J., Connolly, M. P., Cui, W., Daniel, M. K., Falcone, A., Feng, Q., Finley, J. P., Fortson, L., Furniss, A., Hutten, M., Hanna, D., Hervet, O., Holder, J., Hughes, G., Humensky, T. B., Johnson, C. A., Kaaret, P., Kar, P., Kertzman, M., Kieda, D., Krause, M., Krennrich, F., Kumar, S., Lang, M. J., Lin, T. T. Y., McArthur, S., Moriarty, P., Mukherjee, R., O'Brien, S., Ong, R. A., Otte, A. N., Park, N., Petrashyk, A., Pohl, M., Pueschel, E., Quinn, J., Ragan, K., Reynolds, P. T., Richards, G. T., Roache, E., Rulten, C., Sadeh, I., Santander, M., Sembroski, G. H., Shahinyan, K., Sushch, I., Tyler, J., Wakely, S. P., Weinstein, A., Wells, R. M., Wilcox, P., Wilhelm, A., Williams, D. A., Williamson, T. J., Zitzer, B., Collaboration, Fermi-LAT, Abdollahi, S., Ajello, M., Baldini, L., Barbiellini, G., Bastieri, D., Bellazzini, R., Berenji, B., Bissaldi, E., Blandford, R. D., Bonino, R., Bottacini, E., Brandt, T. J., Bruel, P., Buehler, R., Cameron, R. A., Caputo, R., Caraveo, P. A., Castro, D., Cavazzuti, E., Charles, E., Chiaro, G., Ciprini, S., Cohen-Tanugi, J., Costantin, D., Cutini, S., D'Ammando, F., de Palma, F., Di Lalla, N., Di Mauro, M., Di Venere, L., Dominguez, A., Favuzzi, C., Fegan, S. J., Franckowiak, A., Fukazawa, Y., Funk, S., Fusco, P., Gargano, F., Gasparrini, D., Giglietto, N., Giordano, F., Giroletti, M., Green, D., Grenier, I. A., Guillemot, L., Guiriec, S., Hays, E., Hewitt, J. W., Horan, D., Johannesson, G., Kensei, S., Kuss, M., Larsson, S., Latronico, L., Lemoine-Goumard, M., Li, J., Longo, F., Loparco, F., Lovellette, M. N., Lubrano, P., Magill, J. D., Maldera, S., Mazziotta, M. N., McEnery, J. E., Michelson, P. F., Mitthumsiri, W., Mizuno, T., Monzani, M. E., Morselli, A., Moskalenko, I. V., Negro, M., Nuss, E., Ojha, R., Omodei, N., Orienti, M., Orlando, E., Palatiello, M., Paliya, V. S., Paneque, D., Perkins, J. S., Persic, M., Pesce-Rollins, M., Petrosian, V., Piron, F., Porter, T. A., Principe, G., Raino, S., Rando, R., Rani, B., Razzano, M., Razzaque, S., Reimer, A., Reimer, O., Reposeur, T., Sgro, C., Siskind, E. J., Spandre, G., Spinelli, P., Suson, D. J., Tajima, H., Thayer, J. B., Thompson, D. J., Torres, D. F., Tosti, G., Troja, E., Valverde, J., Vianello, G., Vogel, M., Wood, K., Yassine, M., Collaboration, HAWC, Alfaro, R., Alvarez, C., Alvarez, J. D., Arceo, R., Arteaga-Velazquez, J. C., Rojas, D. Avila, Solares, H. A. Ayala, Becerril, A., Belmont-Moreno, E., BenZvi, S. Y., Bernal, A., Braun, J., Brisbois, C., Caballero-Mora, K. S., Capistran, T., Carraminana, A., Casanova, S., Castillo, M., Cotti, U., Cotzomi, J., de Leon, S. Coutino, De Leon, C., De la Fuente, E., Dichiara, S., Dingus, B. L., DuVernois, M. A., Diaz-Velez, J. C., Engel, K., Enriquez-Rivera, O., Fiorino, D. W., Fleischhack, H., Fraija, N., Garcia-Gonzalez, J. A., Garfias, F., Munoz, A. Gonzalez, Gonzalez, M. M., Goodman, J. A., Hampel-Arias, Z., Harding, J. P., Hernandez, S., Hernandez-Almada, A., Hona, B., Hueyotl-Zahuantitla, F., Hui, C. M., Huntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kaufmann, S., Lara, A., Lauer, R. J., Lee, W. H., Lennarz, D., Vargas, H. Leon, Linnemann, J. T., Longinotti, A. L., Luis-Raya, G., Luna-Garcia, R., Lopez-Coto, R., Malone, K., Marinelli, S. S., Martinez, O., Martinez-Castellanos, I., Martinez-Castro, J., Martinez-Huerta, H., Matthews, J. A., Miranda-Romagnoli, P., Moreno, E., Mostafa, M., Nayerhoda, A., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Pelayo, R., Pretz, J., Perez-Perez, E. G., Ren, Z., Rho, C. D., Riviere, C., Rosa-Gonzalez, D., Rosenberg, M., Ruiz-Velasco, E., Salazar, H., Greus, F. Salesa, Sandoval, A., Schneider, M., Arroyo, M. Seglar, Sinnis, G., Smith, A. J., Springer, R. W., Surajbali, P., Taboada, I., Tibolla, O., Tollefson, K., Torres, I., Ukwatta, T. N., Villasenor, L., Weisgarber, T., Westerhoff, S., Wisher, I. G., Wood, J., Yapici, T., Yodh, G., Zepeda, A., and Zhou, H.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

The HAWC (High Altitude Water Cherenkov) collaboration recently published their 2HWC catalog, listing 39 very high energy (VHE; >100~GeV) gamma-ray sources based on 507 days of observation. Among these, there are nineteen sources that are not associated with previously known TeV sources. We have studied fourteen of these sources without known counterparts with VERITAS and Fermi-LAT. VERITAS detected weak gamma-ray emission in the 1~TeV-30~TeV band in the region of DA 495, a pulsar wind nebula coinciding with 2HWC J1953+294, confirming the discovery of the source by HAWC. We did not find any counterpart for the selected fourteen new HAWC sources from our analysis of Fermi-LAT data for energies higher than 10 GeV. During the search, we detected GeV gamma-ray emission coincident with a known TeV pulsar wind nebula, SNR G54.1+0.3 (VER J1930+188), and a 2HWC source, 2HWC J1930+188. The fluxes for isolated, steady sources in the 2HWC catalog are generally in good agreement with those measured by imaging atmospheric Cherenkov telescopes. However, the VERITAS fluxes for SNR G54.1+0.3, DA 495, and TeV J2032+4130 are lower than those measured by HAWC and several new HAWC sources are not detected by VERITAS. This is likely due to a change in spectral shape, source extension, or the influence of diffuse emission in the source region., Comment: Accepted for publication in the ApJ, Corresponding author: Nahee Park (VERITAS Collaboration), John W. Hewitt (Fermi-LAT Collaboration), Ignacio Taboada (HAWC Collaboration), 30 pages, 12 figures

Published
2018
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128. First HAWC Observations of the Sun Constrain Steady TeV Gamma-Ray Emission

Author

Albert, A., Alfaro, R., Alvarez, C., Arceo, R., Arteaga-Velázquez, J. C., Rojas, D. Avila, Solares, H. A. Ayala, Belmont-Moreno, E., BenZvi, S. Y., Brisbois, C., Caballero-Mora, K. S., Capistràn, T., Carramiñana, A., Casanova, S., Castillo, M., Cotzomi, J., de León, S. Coutiño, De León, C., De la Fuente, E., Dichiara, S., Dingus, B. L., DuVernois, M. A., Díaz-Vélez, J. C., Engel, K., Enríquez-Rivera, O., Espinoza, C., Fleischhack, H., Fraija, N., García-González, J. A., Garfias, F., González, M. M., Goodman, J. A., Hampel-Arias, Z., Harding, J. P., Hernandez, S., Hona, B., Hueyotl-Zahuantitla, F., Hüntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kaufmann, S., Vargas, H. León, Luis-Raya, G., Lundeen, J., López-Coto, R., Malone, K., Marinelli, S. S., Martinez, O., Martinez-Castellanos, I., Martínez-Castro, J., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nayerhoda, A., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Pretz, J., Pérez-Pérez, E. G., Ren, Z., Rho, C. D., Rivière, C., Rosa-González, D., Rosenberg, M., Ruiz-Velasco, E., Salazar, H., Greus, F. Salesa, Sandoval, A., Schneider, M., Schoorlemmer, H., Arroyo, M. Seglar, Sinnis, G., Smith, A. J., Surajbali, P., Taboada, I., Tibolla, O., Tollefson, K., Torres, I., Villaseñor, L., Weisgarber, T., Westerhoff, S., Wisher, I. G., Wood, J., Yapici, T., Zepeda, A., Zhou, H., Álvarez, J. D., Beacom, J. F., Leane, R. K., Linden, T., Ng, K. C. Y., Peter, A. H. G., and Zhou, B.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Solar and Stellar Astrophysics, High Energy Physics - Phenomenology
Abstract

Steady gamma-ray emission up to at least 200 GeV has been detected from the solar disk in the Fermi-LAT data, with the brightest, hardest emission occurring during solar minimum. The likely cause is hadronic cosmic rays undergoing collisions in the Sun's atmosphere after being redirected from ingoing to outgoing in magnetic fields, though the exact mechanism is not understood. An important new test of the gamma-ray production mechanism will follow from observations at higher energies. Only the High Altitude Water Cherenkov (HAWC) Observatory has the required sensitivity to effectively probe the Sun in the TeV range. Using three years of HAWC data from November 2014 to December 2017, just prior to the solar minimum, we search for 1--100 TeV gamma rays from the solar disk. No evidence of a signal is observed, and we set strong upper limits on the flux at a few $10^{-12}$ TeV$^{-1}$ cm$^{-2}$ s$^{-1}$ at 1 TeV. Our limit, which is the most constraining result on TeV gamma rays from the Sun, is $\sim10\%$ of the theoretical maximum flux (based on a model where all incoming cosmic rays produce outgoing photons), which in turn is comparable to the Fermi-LAT data near 100 GeV. The prospects for a first TeV detection of the Sun by HAWC are especially high during solar minimum, which began in early 2018., Comment: 14 pages, 6 figures. See also companion paper 1808.05624. Accepted for publication in Physical Review D

Published
2018
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129. Constraints on Spin-Dependent Dark Matter Scattering with Long-Lived Mediators from TeV Observations of the Sun with HAWC

Author

Albert, A., Alfaro, R., Alvarez, C., Arceo, R., Arteaga-Velázquez, J. C., Rojas, D. Avila, Solares, H. A. Ayala, Belmont-Moreno, E., BenZvi, S. Y., Brisbois, C., Caballero-Mora, K. S., Capistràn, T., Carramiñana, A., Casanova, S., Castillo, M., Cotzomi, J., de León, S. Coutiño, De León, C., De la Fuente, E., Dichiara, S., Dingus, B. L., DuVernois, M. A., Díaz-Vélez, J. C., Engel, K., Enríquez-Rivera, O., Espinoza, C., Fleischhack, H., Fraija, N., García-González, J. A., Garfias, F., González, M. M., Goodman, J. A., Hampel-Arias, Z., Harding, J. P., Hernandez, S., Hona, B., Hueyotl-Zahuantitla, F., Hüntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kaufmann, S., Vargas, H. León, Luis-Raya, G., Lundeen, J., López-Coto, R., Malone, K., Marinelli, S. S., Martinez, O., Martinez-Castellanos, I., Martínez-Castro, J., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nayerhoda, A., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Pretz, J., Pérez-Pérez, E. G., Ren, Z., Rho, C. D., Rivière, C., Rosa-González, D., Rosenberg, M., Ruiz-Velasco, E., Salazar, H., Greus, F. Salesa, Sandoval, A., Schneider, M., Arroyo, M. Seglar, Sinnis, G., Smith, A. J., Surajbali, P., Taboada, I., Tibolla, O., Tollefson, K., Torres, I., Villaseñor, L., Weisgarber, T., Westerhoff, S., Wisher, I. G., Wood, J., Yapici, T., Zepeda, A., Zhou, H., Álvarez, J. D., Beacom, J. F., Leane, R. K., Linden, T., Ng, K. C. Y., Peter, A. H. G., and Zhou, B.

Subjects
High Energy Physics - Phenomenology, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Solar and Stellar Astrophysics
Abstract

We analyze the Sun as a source for the indirect detection of dark matter through a search for gamma rays from the solar disk. Capture of dark matter by elastic interactions with the solar nuclei followed by annihilation to long-lived mediators can produce a detectable gamma-ray flux. We search three years of data from the High Altitude Water Cherenkov Observatory and find no statistically significant detection of TeV gamma-ray emission from the Sun. Using this, we constrain the spin-dependent elastic scattering cross section of dark matter with protons for dark matter masses above 1 TeV, assuming an unstable mediator with a favorable lifetime. The results complement constraints obtained from Fermi-LAT observations of the Sun and together cover WIMP masses between 4 GeV and $10^6$ GeV. The cross section constraints for mediator decays to gamma rays can be as strong as $\sim10^{-45}$ cm$^{-2}$, which is more than four orders of magnitude stronger than current direct-detection experiments for 1 TeV dark matter mass. The cross-section constraints at higher masses are even better, nearly 7 orders of magnitude better than the current direct-detection constraints for 100 TeV dark matter mass. This demonstration of sensitivity encourages detailed development of theoretical models in light of these powerful new constraints., Comment: 11 pages, 4 figures. See also companion paper 1808.05620. Accepted for publication in Physical Review D

Published
2018
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130. Multiplicities of jumping points for mixed multiplier ideals

Author

Alberich-Carramiñana, Maria, Montaner, Josep Àlvarez, Dachs-Cadefau, Ferran, and González-Alonso, Víctor

Subjects
Mathematics - Algebraic Geometry
Abstract

In this paper we make a systematic study of the multiplicity of the jumping points associated to the mixed multiplier ideals of a family of ideals in a complex surface with rational singularities. In particular we study the behaviour of the multiplicity by small perturbations of the jumping points. We also introduce a Poincar\'e series for mixed multiplier ideals and prove its rationality. Finally, we study the set of divisors that contribute to the log-canonical wall., Comment: 21 pages

Published
2018

131. Multiwavelength Photometric and Spectropolarimetric Analysis of the FSRQ 3C 279

Author

Patiño-Álvarez, V. M., Fernandes, S., Chavushyan, V., López-Rodríguez, E., León-Tavares, J., Schlegel, E. M., Carrasco, L., Valdés, J., and Carramiñana, A.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

In this paper, we present light curves for 3C 279 over a time period of six years; from 2008 to 2014. Our multiwavelength data comprise 1 mm to gamma-rays, with additional optical polarimetry. Based on the behaviour of the gamma-ray light curve with respect to other bands, we identified three different activity periods. One of the activity periods shows anomalous behaviour with no gamma-ray counterpart associated with optical and NIR flares. Another anomalous activity period shows a flare in gamma-rays, 1 mm and polarization degree, however, it does not have counterparts in the UV continuum, optical and NIR bands. We find a significant overall correlation of the UV continuum emission, the optical and NIR bands. This correlation suggests that the NIR to UV continuum is co-spatial. We also find a correlation between the UV continuum and the 1 mm data, which implies that the dominant process in producing the UV continuum is synchrotron emission. The gamma-ray spectral index shows statistically significant variability and an anti-correlation with the gamma-ray luminosity. We demonstrate that the dominant gamma-ray emission mechanism in 3C 279 changes over time. Alternatively, the location of the gamma-ray emission zone itself may change depending on the activity state of the central engine., Comment: 32 pages, 19 figures, Accepted for publication in MNRAS

Published
2018
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132. Observation of Anisotropy of TeV Cosmic Rays with Two Years of HAWC

Author

Abeysekara, A. U., Alfaro, R., Alvarez, C., Alvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., Rojas, D. Avila, Solares, H. A. Ayala, Becerril, A., Belmont-Moreno, E., BenZvi, S. Y., Bernal, A., Braun, J., Caballero-Mora, K. S., Capistrán, T., Carramiñana, A., Casanova, S., Castillo, M., Cotti, U., Cotzomi, J., De León, C., De la Fuente, E., Hernandez, R. Diaz, Dichiara, S., Dingus, B. L., DuVernois, M. A., Díaz-Vélez, J. C., Engel, K., Fiorino, D. W., Fraija, N., García-González, J. A., Garfias, F., Muñoz, A. González, González, M. M., Goodman, J. A., Hampel-Arias, Z., Harding, J. P., Hernandez, S., Hona, B., Hueyotl-Zahuantitla, F., Hui, C. M., Hüntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kaufmann, S., Lara, A., Lauer, R. J., Lee, W. H., Vargas, H. León, Longinotti, A. L., Luis-Raya, G., Luna-García, R., López-Cámara, D., López-Coto, R., Malone, K., Marinelli, S. S., Martinez, O., Martinez-Castellanos, I., Martínez-Castro, J., Martínez-Huerta, H., Matthews, J. A., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nayerhoda, A., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Pelayo, R., Pretz, J., Pérez-Pérez, E. G., Ren, Z., Rho, C. D., Rivière, C., Rosa-González, D., Rosenberg, M., Ruiz-Velasco, E., Greus, F. Salesa, Sandoval, A., Schneider, M., Schoorlemmer, H., Arroyo, M. Seglar, Sinnis, G., Smith, A. J., Springer, R. W., Surajbali, P., Taboada, I., Tibolla, O., Tollefson, K., Torres, I., Vianello, G., Villaseñor, L., Weisgarber, T., Werner, F., Westerhoff, S., Wood, J., Yapici, T., Zepeda, A., and Zhou, H.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

After two years of operation, the High-Altitude Water Cherenkov (HAWC) Observatory has analyzed the TeV cosmic-ray sky over an energy range between $2.0$ and $72.8$ TeV. The HAWC detector is a ground-based air-shower array located at high altitude in the state of Puebla, Mexico. Using 300 light-tight water tanks, it collects the Cherenkov light from the particles of extensive air showers from primary gamma rays and cosmic rays. This detection method allows for uninterrupted observation of the entire overhead sky (2~sr instantaneous, 8.5~sr integrated) in the energy range from a few TeV to hundreds of TeV. Like other detectors in the northern and southern hemisphere, HAWC observes an energy-dependent anisotropy in the arrival direction distribution of cosmic rays. The observed cosmic-ray anisotropy is dominated by a dipole moment with phase $\alpha\approx40^{\circ}$ and amplitude that slowly rises in relative intensity from $8\times10^{-4}$ at 2 TeV to $14\times10^{-4}$ around 30.3 TeV, above which the dipole decreases in strength. A significant large-scale ($>60^{\circ}$ in angular extent) signal is also observed in the quadrupole and octupole moments, and significant small-scale features are also present, with locations and shapes consistent with previous observations. Compared to previous measurements in this energy range, the HAWC cosmic-ray sky maps improve on the energy resolution and fit precision of the anisotropy. These data can be used in an effort to better constrain local cosmic-ray accelerators and the intervening magnetic fields., Comment: 22 pages, 14 figures, 2 tables, submission to ApJ

Published
2018
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133. Search for Dark Matter Gamma-ray Emission from the Andromeda Galaxy with the High-Altitude Water Cherenkov Observatory

Author

Albert, A., Alfaro, R., Alvarez, C., Alvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., Rojas, D. Avila, Solares, H. A. Ayala, Becerril, A., Belmont-Moreno, E., BenZvi, S. Y., Bernal, A., Brisbois, C., Caballero-Mora, K. S., Capistrán, T., Carramiñana, A., Casanova, S., Castillo, M., Cotti, U., Cotzomi, J., de León, S. Coutiño, De León, C., Dichiara, S., Dingus, B. L., DuVernois, M. A., Díaz-Vélez, J. C., Eckner, C., Engel, K., Enríquez-Rivera, O., Espinoza, C., Fiorino, D. W., Fraija, N., Galván-Gámez, A., García-González, J. A., Garfias, F., Muñoz, A. González, González, M. M., Goodman, J. A., Hampel-Arias, Z., Harding, J. P., Hernandez, S., Hernandez-Almada, A., Hona, B., Hüntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kaufmann, S., Kunde, G. J., Lennarz, D., Vargas, H. León, Linnemann, J. T., Longinotti, A. L., Raya, G. Luis, Luna-García, R., Malone, K., Marinelli, S. S., Martinez, O., Martínez-Castro, J., Martínez-Huerta, H., Matthews, J. A., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nayerhoda, A., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Pelayo, R., Pretz, J., Pérez-Pérez, E. G., Ren, Z., Rho, C. D., Riviére, C., Rosa-González, D., Rosenberg, M., Ruiz-Velasco, E., Salazar, H., Greus, F. Salesa, Sandoval, A., Schneider, M., Arroyo, M. Seglar, Sinnis, G., Smith, A. J., Springer, R. W., Surajbali, P., Taboada, I., Tibolla, O., Tollefson, K., Torres, I., Ukwatta, T. N., Villaseñor, L., Weisgarber, T., Westerhoff, S., Wood, J., Yapici, T., Zaharijas, G., Zepeda, A., and Zhou, H.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

The Andromeda Galaxy (M31) is a nearby ($\sim$780 kpc) galaxy similar to our own Milky Way. Observational evidence suggests that it resides in a large halo of dark matter (DM), making it a good target for DM searches. We present a search for gamma rays from M31 using 1017 days of data from the High Altitude Water Cherenkov (HAWC) Observatory. With its wide field of view and constant monitoring, HAWC is well-suited to search for DM in extended targets like M31. No DM annihilation or decay signal was detected for DM masses from 1 to 100 TeV in the $b\bar{b}$, $t\bar{t}$, $\tau^{+}\tau^{-}$, $\mu^{+}\mu^{-}$, and $W^{+}W^{-}$ channels. Therefore we present limits on those processes. Our limits nicely complement the existing body of DM limits from other targets and instruments. Specifically the DM decay limits from our benchmark model are the most constraining for DM masses from 25 TeV to 100 TeV in the $b\bar{b}, t\bar{t}$ and $\mu^{+}\mu{-}$ channels. In addition to DM-specific limits, we also calculate general gamma-ray flux limits for M31 in 5 energy bins from 1 TeV to 100 TeV., Comment: published in JCAP. Figure 6 (bottom) has been corrected

Published
2018
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134. Constraining the $\bar{p}/p$ Ratio in TeV Cosmic Rays with Observations of the Moon Shadow by HAWC

Author

Abeysekara, A. U., Albert, A., Alfaro, R., Alvarez, C., Arceo, R., Arteaga-Velázquez, J. C., Rojas, D. Avila, Solares, H. A. Ayala, Belmont-Moreno, E., BenZvi, S. Y., Braun, J., Brisbois, C., Caballero-Mora, K. S., Capistrán, T., Carramiñana, A., Casanova, S., Castillo, M., Cotti, U., Cotzomi, J., de León, S. Coutiño, De León, C., la Fuentem, E. D, Hernandez, R. Diaz, Dichiara, S., Dingus, B. L., DuVernois, M. A., Ellsworth, R. W., Engels, K., Enríquez-Rivera, O., Fleischhack, H., Fraija, N., Galván-Gámez, A., García-González, J. A., Muñoz, A. González, González, M. M., Goodman, J. A., Hampel-Arias, Z., Harding, J. P., Hernandez, S., Hona, B., Hueyotl-Zahuantitla, F., Hui, C. M., Hüntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kaufmann, S., Lara, A., Lee, W. H., Vargas, H. León, Linnemann, J. T., Longinotti, A. L., Luis-Raya, G., Luna-García, R., López-Coto, R., Malone, K., Marinelli, S. S., Martinez, O., Martinez-Castellanos, I., Martínez-Castro, J., Martínez-Huerta, H., Matthews, J. A., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nayerhoda, A., Nellena, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Pelayo, R., Pretz, J., Pérez-Pérez, E. G., Ren, Z., Rho, C. D., Riviére, C., Rosa-González, D., Rosenberg, M., Ruiz-Velasco, E., Greus, F. Salesa, Sandoval, A., Schneider, M., Schoorlemmer, H., Arroyo, M. Seglar, Sinnis, G., Smith, A. J., Springer, R. W., Surajbali, P., Taboada, I., Tibolla, O., Tollefson, K., Torres, I., Villaseñor, L., Weisgarber, T., Westerhoff, S., Wood, J., Yapici, T., Yodha, G. B., Zepeda, A., Zhou, H., and Alvarez, J. D.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

An indirect measurement of the antiproton flux in cosmic rays is possible as the particles undergo deflection by the geomagnetic field. This effect can be measured by studying the deficit in the flux, or shadow, created by the Moon as it absorbs cosmic rays that are headed towards the Earth. The shadow is displaced from the actual position of the Moon due to geomagnetic deflection, which is a function of the energy and charge of the cosmic rays. The displacement provides a natural tool for momentum/charge discrimination that can be used to study the composition of cosmic rays. Using 33 months of data comprising more than 80 billion cosmic rays measured by the High Altitude Water Cherenkov (HAWC) observatory, we have analyzed the Moon shadow to search for TeV antiprotons in cosmic rays. We present our first upper limits on the $\bar{p}/p$ fraction, which in the absence of any direct measurements, provide the tightest available constraints of $\sim1\%$ on the antiproton fraction for energies between 1 and 10 TeV., Comment: 10 pages, 5 figures. Accepted by Physical Review D

Published
2018
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136. Intraoperative positive end-expiratory pressure and postoperative pulmonary complications: a patient-level meta-analysis of three randomised clinical trials

Author

Hemmes, Sabrine NT., Gama de Abreu, Marcelo, Severgnini, Paolo, Hollmann, Markus W., Binnekade, Jan M., Wrigge, Hermann, Canet, Jaume, Hiesmayr, Michael, Schmid, Werner, Tschernko, Edda, Jaber, Samir, Hedenstierna, Göran, Putensen, Christian, Pelosi, Paolo, Schultz, Marcus J., Marti, Agnes, Bacuzzi, Alessandro, Brodhun, Alexander, Molin, Alexandre, Merten, Alfred, Parera, Ana, Brunelli, Andrea, Cortegiani, Andrea, Güldner, Andreas, Reske, Andreas W., Gratarola, Angelo, Giarratano, Antonino, Bastin, Bea, Heyse, Bjorn, Mazul-Sunko, Branka, Amantea, Bruno, Barberis, Bruno, Uhlig, Christopher, Marín, Conrado Minguez, Celentano, Cristian, La Bella, Daniela, D’Antini, David, Velghe, David, Sulemanji, Demet, De Robertis, Edoardo, Hartmann, Eric, Montalto, Francesca, Tropea, Francesco, Mills, Gary H., Cinnella, Gilda, Della Rocca, Giorgio, Caggianelli, Girolamo, Pellerano, Giulia, Mollica, Giuseppina, Bugedo, Guillermo, Mulier, Jan-Paul, Vandenbrande, Jeroen, Geib, Johann, Yaqub, Jonathan, Florez, Jorge, Mayoral, Juan F., Sprung, Juraj, Van Limmen, Jurgen, Bos, Lieuwe DJ., de Baerdemaeker, Luc, Jamaer, Luc, Spagnolo, Luigi, Strys, Lydia, Gil, Manuel Granell, Vidal Melo, Marcos F., Unzueta, Maria Carmen, Moral, Maria Victoria, Ferner, Marion, Weiss, Martin, Vanoni, Massimo, Schaefer, Maximilian S., Prieto, Mercè, Grio, Michele, Spieth, Peter Markus, Simon, Philipp, Bodger, Phoebe, Sierra, Pilar, Laufenberg-Feldmann, Rita, Rusca, Roberta, Proietti, Rodolfo, Raineri, Santi Maurizio, Caroleo, Santo, Sabaté, Sergi, De Hert, Stefan, Pezzato, Stefano, Treschan, Tanja A., Goranovic, Tatjana, Koch, Thea, Bluth, Thomas, Kiss, Thomas, Perilli, Valter, Cegarra, Virginia, Ferrando, Carlos, Belda, Javier, Soro, Marina, Unzueta, Carmen, Suarez-Sipmann, Fernando, Librero, Julián, Llombart, Alicia, Rovira, Lucas, Granell, Manuel, Aldecoa, César, Diaz-Cambronero, Oscar, Balust, Jaume, Garutti, Ignacio, Gonzalez, Rafael, Gallego, Lucia, Garcia del Valle, Santiago, Redondo, Javier, Pestaña, David, Rodríguez, Aurelio, García, Javier, Matta, Manuel de la, Ibáñez, Maite, Barrios, Francisco, Hernández, Samuel, Torres, Vicente, Peiró, Salvador, Pozo, Natividad, Villena, Abigail, Carramiñana, Albert, Gallego-Casilda, Alberto, Duca, Alejandro, Alcón, Amalia, Miñana, Amanda, Asensio, Ana, Colás, Ana, Galve, Ana Isabel, Izquierdo, Ana, Jurado, Ana, Pérez, Ana María, Mugarra, Ana, Gutierrez, Andrea, De Miguel, Ángeles, Lozano, Angels, Katime, Antonio, Romero, Antonio, Garrigues, Beatriz, Ayas, Begoña, Arocas, Blanca, Delgado, Carlos, Fernández, Carmen, Romero, Carolina, Gallego, Clara, Garcés, Cristina, Lisbona, Cristina, Parrilla, Cristina, López-Herrera, Daniel, González, Domingo, Llamazares, Eduardo, Del Rio, Elena, Lozano, Elena, Pastor, Ernesto, Chamorro, Estefanía, Gracia, Estefanía, Sánchez, Ester, Romero, Esther, Díez, Fernando, Serralta, Ferran, Daviu, Francisco, Sandín, Francisco, Aguilar, Gerardo, Tusman, Gerardo, Azparren, Gonzalo, Martínez-Pallí, Graciela, Mazzinari, Guido, Benítez, Inmaculada, Hernandéz, Inmaculada, India, Inmaculada, León, Irene, Fuentes, Isabel, Ruiz, Isabel, Puig, Jaume, Román, Javie Ignacio, Acosta, Jesús, Rico-Feijoo, Jesús, Olmedo, Jonathan, Carbonell, Jose A., Alonso, Jose M., Pérez, Jose María, Marcos, Jose Miguel, Navarro, Jose, Valdivia, Jose, Carrizo, Juan, Piqueras, Laura, Soriano, Laura, Vaquero, Laura, Miguel, Lisset, Muñoz, Lorena, Valencia, Lucia, Olmedilla, Luis, Etulain, Mᵃ Justina, Tisner, Manuel, Barrio, María, Alonso, María Dolores, García, María, Hernández, María J., Alberola, María José, Parra, María, Argente, María Pilar, Vila, María, De Fez, Mario, Agilaga, Marta, Gine, Marta, Ayuso, Mercedes, García, Mercedes, Bejarano, Natalia, Peña, Natalia, Ojeda, Nazario, Martínez, Nilda, García, Nuria, Padrón, Oto, García, Pablo, Valls, Paola, Cruz, Patricia, Piñeiro, Patricia, Charco, Pedro, Anaya, Rafael, López, Ramiro, Rodríguez, Rayco, Martínez, Rocío, Pujol, Roger, Dosdá, Rosa, Lardies, Rosa, Díaz, Ruben, Villazala, Rubén, Zapatero, Sara, Cabrera, Sergio, Sánchez, Sergio, Martin, Silvia, Diaz, Suzana, Franco, Tania, Moreno, Tania, Socorro, Tania, Gilabert, Vicente, Balandrón, Victor, Moral, Victoria, Cegarra, Virgina, Varón, Viviana, Abelha, Fernando, Abitağaoğlu, Sühayla, Achilles, Marc, Adebesin, Afeez, Adriaensens, Ine, Ahene, Charles, Akbar, Fatima, Al Harbi, Mohammed, Al Khoury al Kallab, Rita, Albanel, Xavier, Aldenkortt, Florence, Saleh Alfouzan, Rawan Abdullah, Alruqaie, Reef, Altermatt, Fernando, Luís de Castro Araujo, Bruno, Arbesú, Genaro, Artsi, Hanna, Aurilio, Caterina, Ayanoglu, Omer Hilmi, Baig, Harris, Baird, Yolanda, Balonov, Konstantin, Banks, Samantha, Bao, Xiaodong, Baumgartner, Mélanie, Tortosa, Isabel Belda, Bergamaschi, Alice, Bergmann, Lars, Bigatello, Luca, Pérez, Elena Biosca, Birr, Katja, Bojaxhi, Elird, Bonenti, Chiara, Bonney, Iwona, Bos, Elke M.E., Bowman, Sara, Braz, Leandro Gobbo, Brugnoni, Elisa, Brull, Sorin J., Brunetti, Iole, Bruni, Andrea, Buenvenida, Shonie L., Busch, Cornelius Johannes, Camerini, Giovanni, Capatti, Beatrice, Carmona, Javiera, Carungcong, Jaime, Carvalho, Marta, Cattan, Anat, Cavaleiro, Carla, Chiumello, Davide, Ciardo, Stefano, Coburn, Mark, Colella, Umberto, Contreras, Victor, Dincer, Pelin Corman, Cotter, Elizabeth, Crovetto, Marcia, Darrah, William, Davies, Simon, Del Cojo Peces, Enrique, Delphin, Ellise, Diaper, John, Junior, Paulo do Nascimento, Donatiello, Valerio, Dong, Jing, Dourado, Maria do Socorro, Dullenkopf, Alexander, Ebner, Felix, Elgendy, Hamed, Ellenberger, Christoph, Arı, Dilek Erdoğan, Ermert, Thomas, Farah, Fadi, Fernandez-Bustamante, Ana, Ferreira, Cristina, Fiore, Marco, Fonte, Ana, Palahí, Christina Fortià, Galimberti, Andrea, Garofano, Najia, Giaccari, Luca Gregorio, Gilsanz, Fernando, Girrbach, Felix, Gobbi, Luca, Godfried, Marc Bernard, Goettel, Nicolai, Goldstein, Peter A., Goren, Or, Gorlin, Andrew, Graterol, Juan, Guyon, Pierre, Haire, Kevin, Harou, Philippe, Helf, Antonia, Hemmes, Sabrine N.T., Hempel, Gunther, Hernández Cádiz, María José, Heyse, Björn, Huercio, Ivan, Ilievska, Jasmina, Jakus, Lien, Jeganath, Vijay, Jelting, Yvonne, Jung, Minoa, Kabon, Barbara, Kacha, Aalok, Ilić, Maja Karaman, Karuppiah, Arunthevaraja, Kavas, Ayse Duygu, Barcelos, Gleicy Keli, Kellogg, Todd A., Kemper, Johann, Kerbrat, Romain, Khodr, Suraya, Kienbaum, Peter, Kir, Bunyamin, Kivrak, Selin, Klarić, Vlasta, Köksal, Ceren, Kowark, Ana, Kranke, Peter, Kuvaki, Bahar, Kuzmanovska, Biljana, Laffey, John, Lange, Mirko, Freitas de Lemos, Marília, Licker, Marc-Joseph, López-Baamonde, Manuel, López-Hernández, Antonio, Lopez-Martinez, Mercedes, Luise, Stéphane, MacGregor, Mark, Magalhães, Danielle, Maillard, Julien, Malerbi, Patrizia, Manimekalai, Natesan, Margarson, Michael, Markstaller, Klaus, Martin, Archer K., Martin, David P., Martin, Yvette N., Martínez-Ocon, Julia, Martin-Loeches, Ignacio, Maseda, Emilio, Matot, Idit, McAuliffe, Niamh, McKenzie, Travis J., Medina, Paulina, Meersch, Melanie, Menzen, Angelika, Mertens, Els, Meurer, Bernd, Meyer-Treschan, Tanja, Miao, Changhong, Micalizzi, Camilla, Milić, Morena, Pinheiro Módolo, Norma Sueli, Moine, Pierre, Mölders, Patrick, Montero-Feijoo, Ana, Moret, Enrique, Muller, Markus K., Murphy, Zoe, Nalwaya, Pramod, Naumovski, Filip, Navalesi, Paolo, Navarro e Lima, Lais Helena, Adam, Višnja Nesek, Neumann, Claudia, Newell, Christopher, Nisnevitch, Zoulfira, Nizamuddin, Junaid, Novazzi, Cecilia, O'Connor, Michael, Oprea, Günther, Sungur, Mukadder Orhan, Özbilgin, Şule, Pace, Maria Caterina, Pacheco, Marcos, Packianathaswamy, Balaji, Gonzalez, Estefania Palma, Papaspyros, Fotios, Paredes, Sebastián, Passavanti, Maria Beatrice, Pedemonte, Juan Cristobal, Peremin, Sanja, Philipsenburg, Christoph, Pinho, Daniela, Pinho, Silvia, Posthuma, Linda M., Pota, Vincenzo, Preckel, Benedikt, Priani, Paolo, Rached, Mohamed Aymen, Radoeshki, Aleksandar, Ragazzi, Riccardo, Rajamanickam, Tamilselvan, Rajamohan, Arthi, Ramakrishna, Harish, Rangarajan, Desikan, Reiterer, Christian, Renew, J. Ross, Reynaud, Thomas, Rhys, Rhidian, Rivas, Eva, Robitzky, Luisa, Rossaint, Rolf, Rubulotta, Francesca, Machado, Humberto S., Nunes, Catarina S., Sabbatini, Giovanni, Samuels, Jon D., Sanahuja, Josep Martí, Sansone, Pasquale, Santos, Alice, Sayedalahl, Mohamed, Scharffenberg, Martin, Schiffer, Eduardo, Schliewe, Nadja, Schorer, Raoul, Schumann, Roman, Selmo, Gabriele, Sendra, Mar, Senturk, Mert, Shaw, Kate, Shosholcheva, Mirjana, Sibai, Abdulrazak, Simonassi, Francesca, Sinno, Claudia, Sivrikoz, Nukhet, Skandalou, Vasiliki, Smith, Neil, Soares, Maria, Artiles, Tania Socorro, Castro, Diogo Sousa, Sousa, Miguel, Spadaro, Savino, Stamatakis, Emmanouil, Steiner, Luzius A., Stevenazzi, Andrea, Suarez-de-la-Rica, Alejandro, Suppan, Mélanie, Teichmann, Robert, Tena Guerrero, José Maria, Thiel, Bram, Tolós, Raquel, Altun, Gulbin Tore, Tucci, Michelle, Turnbull, Zachary A., Turudić, Žana, Unterberg, Matthias, Van Nieuwenhove, Yves, Van Waesberghe, Julia, Vidal Melo, Marcos Francisco, Vitković, Bibiana, Vivona, Luigi, Vizcaychipi, Marcela, Volta, Carlo Alberto, Weber, Anne, Weingarten, Toby N., Wittenstein, Jakob, Wyffels, Piet, Yagüe, Julio, Yates, David, Yavru, Ayşen, Zac, Lilach, Zhong, Jing, Campos, Niklas S., Librero, Julian, Ball, Lorenzo, and Serpa Neto, A.

Published
2022
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137. Analysis of the metabolic proteome of lung adenocarcinomas by reverse-phase protein arrays (RPPA) emphasizes mitochondria as targets for therapy

Author

Torresano, Laura, Santacatterina, Fulvio, Domínguez-Zorita, Sonia, Nuevo-Tapioles, Cristina, Núñez-Salgado, Alfonso, Esparza-Moltó, Pau B., González-Llorente, Lucía, Romero-Carramiñana, Inés, Núñez de Arenas, Cristina, Sánchez-Garrido, Brenda, Nájera, Laura, Salas, Clara, Provencio, Mariano, and Cuezva, José M.

Published
2022
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138. Analysis of the metabolic proteome of lung adenocarcinomas by reverse-phase protein arrays (RPPA) emphasizes mitochondria as targets for therapy

Author

Laura Torresano, Fulvio Santacatterina, Sonia Domínguez-Zorita, Cristina Nuevo-Tapioles, Alfonso Núñez-Salgado, Pau B. Esparza-Moltó, Lucía González-Llorente, Inés Romero-Carramiñana, Cristina Núñez de Arenas, Brenda Sánchez-Garrido, Laura Nájera, Clara Salas, Mariano Provencio, and José M. Cuezva

Subjects
Neoplasms. Tumors. Oncology. Including cancer and carcinogens, RC254-282
Abstract

Abstract Lung cancer is the leading cause of cancer-related death worldwide despite the success of therapies targeting oncogenic drivers and immune-checkpoint inhibitors. Although metabolic enzymes offer additional targets for therapy, the precise metabolic proteome of lung adenocarcinomas is unknown, hampering its clinical translation. Herein, we used Reverse Phase Protein Arrays to quantify the changes in enzymes of glycolysis, oxidation of pyruvate, fatty acid metabolism, oxidative phosphorylation, antioxidant response and protein oxidative damage in 128 tumors and paired non-tumor adjacent tissue of lung adenocarcinomas to profile the proteome of metabolism. Steady-state levels of mitochondrial proteins of fatty acid oxidation, oxidative phosphorylation and of the antioxidant response are independent predictors of survival and/or of disease recurrence in lung adenocarcinoma patients. Next, we addressed the mechanisms by which the overexpression of ATPase Inhibitory Factor 1, the physiological inhibitor of oxidative phosphorylation, which is an independent predictor of disease recurrence, prevents metastatic disease. We highlight that IF1 overexpression promotes a more vulnerable and less invasive phenotype in lung adenocarcinoma cells. Finally, and as proof of concept, the therapeutic potential of targeting fatty acid assimilation or oxidation in combination with an inhibitor of oxidative phosphorylation was studied in mice bearing lung adenocarcinomas. The results revealed that this therapeutic approach significantly extended the lifespan and provided better welfare to mice than cisplatin treatments, supporting mitochondrial activities as targets of therapy in lung adenocarcinoma patients.

Published
2022
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139. Characterization of the background for a neutrino search with the HAWC observatory

Author

Albert, A., Alfaro, R., Alvarez, C., Angeles Camacho, J.R., Arteaga-Velázquez, J.C., Arunbabu, K.P., Belmont-Moreno, E., Caballero-Mora, K.S., Capistrán, T., Carramiñana, A., Casanova, S., Cotti, U., Cotzomi, J., Coutiño de León, S., De la Fuente, E., Diaz Hernandez, R., DuVernois, M.A., Durocher, M., Espinoza, C., Fan, K.L., Fraija, N., Garcia, D., García-González, J.A., Garfias, F., González, M.M., Goodman, J.A., Huang, D., Hueyotl-Zahuantitla, F., Hüntemeyer, P., Iriarte, A., Jardin-Blicq, A., Kieda, D., Lara, A., Lee, W.H., León Vargas, H., Longinotti, A.L., Luis-Raya, G., Malone, K., Martínez-Castro, J., Matthews, J.A., Miranda-Romagnoli, P., Morales-Soto, J.A., Moreno, E., Nayerhoda, A., Nellen, L., Noriega-Papaqui, R., Omodei, N., Peisker, A., Pérez-Pérez, E.G., Rho, C.D., Rosa-González, D., Sandoval, A., Serna-Franco, J., Springer, R.W., Tollefson, K., Torres, I., Torres-Escobedo, R., Ureña-Mena, F., Villaseñor, L., Zhou, H., and de León, C.

Published
2022
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140. Extended gamma-ray sources around pulsars constrain the origin of the positron flux at Earth

Author

Abeysekara, A. U., Albert, A., Alfaro, R., Alvarez, C., Álvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., Rojas, D. Avila, Solares, H. A. Ayala, Barber, A. S., Bautista-Elivar, N., Becerril, A., Belmont-Moreno, E., BenZvi, S. Y., Berley, D., Bernal, A., Braun, J., Brisbois, C., Caballero-Mora, K. S., Capistrán, T., Carramiñana, A., Casanova, S., Castillo, M., Cotti, U., Cotzomi, J., de León, S. Coutiño, De León, C., De la Fuente, E., Dingus, B. L., DuVernois, M. A., Díaz-Vélez, J. C., Ellsworth, R. W., Engel, K., Enríquez-Rivera, O., Fiorino, D. W., Fraija, N., García-González, J. A., Garfias, F., Gerhardt, M., Muñoz, A. González, González, M. M., Goodman, J. A., Hampel-Arias, Z., Harding, J. P., Hernández, S., Hernández-Almada, A., Hinton, J., Hona, B., Hui, C. M., Hüntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kaufmann, S., Kieda, D., Lara, A., Lauer, R. J., Lee, W. H., Lennarz, D., Vargas, H. León, Linnemann, J. T., Longinotti, A. L., Raya, G. Luis, Luna-García, R., López-Coto, R., Malone, K., Marinelli, S. S., Martinez, O., Martinez-Castellanos, I., Martínez-Castro, J., Martínez-Huerta, H., Matthews, J. A., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Pelayo, R., Pretz, J., Pérez-Pérez, E. G., Ren, Z., Rho, C. D., Rivière, C., Rosa-González, D., Rosenberg, M., Ruiz-Velasco, E., Salazar, H., Greus, F. Salesa, Sandoval, A., Schneider, M., Schoorlemmer, H., Sinnis, G., Smith, A. J., Springer, R. W., Surajbali, P., Taboada, I., Tibolla, O., Tollefson, K., Torres, I., Ukwatta, T. N., Vianello, G., Weisgarber, T., Westerhoff, S., Wisher, I. G., Wood, J., Yapici, T., Yodh, G., Younk, P. W., Zepeda, A., Zhou, H., Guo, F., Hahn, J., Li, H., and Zhang, H.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

The unexpectedly high flux of cosmic ray positrons detected at Earth may originate from nearby astrophysical sources, dark matter, or unknown processes of cosmic-ray secondary production. We report the detection, using the HighAltitude Water Cherenkov Observatory (HAWC), of extended tera-electron volt gamma-ray emission coincident with the locations of two nearby middle-aged pulsars (Geminga and PSR B0656+14). The HAWC observations demonstrate that these pulsars are indeed local sources of accelerated leptons, but the measured tera-electron volt emission profile constrains the diffusion of particles away from these sources to be much slower than previously assumed. We demonstrate that the leptons emitted by these objects are therefore unlikely to be the origin of the excess positrons, which may have a more exotic origin., Comment: 16 pages (including supplementary material), 5 figures

Published
2017
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141. A Search for Dark Matter in the Galactic Halo with HAWC

Author

Abeysekara, A. U., Albert, A. M., Alfaro, R., Alvarez, C., Álvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., Rojas, D. Avila, Solares, H. A. Ayala, Becerril, A., Belmont-Moreno, E., BenZvi, S. Y., Bernal, A., Brisbois, C., Caballero-Mora, K. S., Capistrán, T., Carramiñana, A., Casanova, S., Castillo, M., Cotti, U., Cotzomi, J., De León, C., De la Fuente, E., Hernandez, R. Diaz, Dingus, B. L., DuVernois, M. A., Díaz-Vélez, J. C., Engel, K., Enríquez-Rivera, O., Fiorino, D. W., Fleischhack, H., Fraija, N., García-González, J. A., Garfias, F., Muñoz, A. González, González, M. M., Goodman, J. A., Hampel-Arias, Z., Harding, J. P., Hernandez, S., Hernandez-Almada, A., Hueyotl-Zahuantitla, F., Hüntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kaufmann, S., Lauer, R. J., Lee, W. H., Lennarz, D., Vargas, H. León, Linnemann, J. T., Longinotti, A. L., Luis-Raya, G., Luna-García, R., López-Coto, R., Malone, K., Marinelli, S. S., Martinez, O., Martinez-Castellanos, I., Martínez-Castro, J., Matthews, J. A., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Pelayo, R., Pretz, J., Pérez-Pérez, E. G., Ren, Z., Rho, C. D., Rodd, N. L., Rosa-González, D., Rosenberg, M., Ruiz-Velasco, E., Safdi, B. R., Salazar, H., Greus, F. Salesa, Sandoval, A., Schneider, M., Sinnis, G., Smith, A. J., Springer, R. W., Surajbali, P., Taboada, I., Tibolla, O., Tollefson, K., Torres, I., Ukwatta, T. N., Vianello, G., Villaseñor, L., Weisgarber, T., Westerhoff, S., Wisher, I. G., Wood, J., Yapici, T., Yodh, G. B., Younk, P. W., Zepeda, A., and Zhou, H.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Nongalactic Astrophysics, High Energy Physics - Phenomenology
Abstract

The High Altitude Water Cherenkov (HAWC) gamma-ray observatory is a wide field-of-view observatory sensitive to 500 GeV - 100 TeV gamma rays and cosmic rays. With its observations over 2/3 of the sky every day, the HAWC observatory is sensitive to a wide variety of astrophysical sources, including possible gamma rays from dark matter. Dark matter annihilation and decay in the Milky Way Galaxy should produce gamma-ray signals across many degrees on the sky. The HAWC instantaneous field-of-view of 2 sr enables observations of extended regions on the sky, such as those from dark matter in the Galactic halo. Here we show limits on the dark matter annihilation cross-section and decay lifetime from HAWC observations of the Galactic halo with 15 months of data. These are some of the most robust limits on TeV and PeV dark matter, largely insensitive to the dark matter morphology. These limits begin to constrain models in which PeV IceCube neutrinos are explained by dark matter which primarily decays into hadrons., Comment: 24 pages, 11 figures

Published
2017
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142. All-particle cosmic ray energy spectrum measured by the HAWC experiment from 10 to 500 TeV

Author

HAWC Collaboration, Alfaro, R., Alvarez, C., Arceo, R., Arteaga-Velázquez, J. C., Rojas, D. Avila, Solares, H. A. Ayala, Barber, A. S., Becerril, A., Belmont-Moreno, E., BenZvi, S. Y., Brisbois, C., Caballero-Mora, K. S., Capistrán, T., Carramiñana, A., Casanova, S., Castillo, M., Cotti, U., Cotzomi, J., de León, S. Coutiño, De León, C., De la Fuente, E., Hernandez, R. Diaz, Dichiara, S., Dingus, B. L., DuVernois, M. A., Díaz-Vélez, J. C., Ellsworth, R. W., Enriquez-Rivera, O., Fiorino, D. W., Fleischhack, H., Fraija, N., García-González, J. A., Muñoz, A. González, González, M. M., Goodman, J. A., Hampel-Arias, Z., Harding, J. P., Hernandez-Almada, A., Hinton, J., Hueyotl-Zahuantitla, F., Hui, C. M., Huntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kaufmann, S., Lara, A., Lauer, R. J., Lennarz, D., Vargas, H. León, Linnemann, J. T., Longinotti, A. L., Raya, G. Luis, Luna-García, R., López-Cámara, D., López-Coto, R., Malone, K., Marinelli, S. S., Martinez, O., Martinez-Castellanos, I., Martínez-Castro, J., Martínez-Huerta, H., Matthews, J. A., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Pelayo, R., Pretz, J., Pérez-Pérez, E. G., Ren, Z., Rho, C. D., Rivière, C., Rosa-González, D., Rosenberg, M., Ruiz-Velasco, E., Greus, F. Salesa, Sandoval, A., Schneider, M., Schoorlemmer, H., Sinnis, G., Smith, A. J., Springer, R. W., Surajbali, P., Taboada, I., Tibolla, O., Tollefson, K., Torres, I., Ukwatta, T. N., Villaseñor, L., Weisgarber, T., Westerhoff, S., Wood, J., Yapici, T., Zepeda, A., Zhou, H., and Álvarez, J. D.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

We report on the measurement of the all-particle cosmic ray energy spectrum with the High Altitude Water Cherenkov (HAWC) Observatory in the energy range 10 to 500 TeV. HAWC is a ground based air-shower array deployed on the slopes of Volcan Sierra Negra in the state of Puebla, Mexico, and is sensitive to gamma rays and cosmic rays at TeV energies. The data used in this work were taken from 234 days between June 2016 to February 2017. The primary cosmic-ray energy is determined with a maximum likelihood approach using the particle density as a function of distance to the shower core. Introducing quality cuts to isolate events with shower cores landing on the array, the reconstructed energy distribution is unfolded iteratively. The measured all-particle spectrum is consistent with a broken power law with an index of $-2.49\pm0.01$ prior to a break at $(45.7\pm0.1$) TeV, followed by an index of $-2.71\pm0.01$. The spectrum also respresents a single measurement that spans the energy range between direct detection and ground based experiments. As a verification of the detector response, the energy scale and angular resolution are validated by observation of the cosmic ray Moon shadow's dependence on energy., Comment: 16 pages, 11 figures, 4 tables, submission to Physical Review D

Published
2017
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143. Data Acquisition Architecture and Online Processing System for the HAWC gamma-ray observatory

Author

HAWC collaboration, Abeysekara, A. U., Alfaro, R., Alvarez, C., Álvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., Solares, H. A. Ayala, Barber, A. S., Baughman, B. M., Bautista-Elivar, N., Gonzalez, J. Becerra, Belmont-Moreno, E., BenZvi, S. Y., Berley, D., Rosales, M. Bonilla, Braun, J., Caballero-Lopez, R. A., Caballero-Mora, K. S., Carramiñana, A., Castillo, M., Cotti, U., Cotzomi, J., de la Fuente, E., De León, C., DeYoung, T., Diaz-Cruz, J., Hernandez, R. Diaz, Díaz-Vélez, J. C., Dingus, B. L., DuVernois, M. A., Ellsworth, R. W., Fiorino, D. W., Fraija, N., Galindo, A., Garfias, F., González, M. M., Goodman, J. A., Grabski, V., Gussert, M., Hampel-Arias, Z., Harding, J. P., Hui, C. M., Hüntemeyer, P., Imran, A., Iriarte, A., Karn, P., Kieda, D., Kunde, G. J., Lara, A., Lauer, R. J., Lee, W. H., Lennarz, D., Vargas, H. León, Linares, E. C., Linnemann, J. T., Proper, M. Longo, Luna-García, R., Malone, K., Marinelli, A., Marinelli, S. S., Martinez, O., Martínez-Castro, J., Martínez-Huerta, H., Matthews, J. A. J., McEnery, J., Torres, E. Mendoza, Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nellen, L., Newbold, M., Noriega-Papaqui, R., Oceguera-Becerra, T., Patricelli, B., Pelayo, R., Pérez-Pérez, E. G., Pretz, J., Rivière, C., Rosa-González, D., Ruiz-Velasco, E., Ryan, J., Salazar, H., Greus, F. Salesa, Sanchez, F. E., Sandoval, A., Schneider, M., Silich, S., Sinni, G., Smith, A. J., Woodle, K. Sparks, Springer, R. W., Taboada, I., Toale, P. A., Tollefson, K., Torres, I., Ukwatta, T. N., Villaseñor, L., Weisgarber, T., Westerhoff, S., Wisher, I. G., Wood, J., Yapici, T., Yodh, G. B., Younk, P. W., Zaborov, D., Zepeda, A., and Zhou, H.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The High Altitude Water Cherenkov observatory (HAWC) is an air shower array devised for TeV gamma-ray astronomy. HAWC is located at an altitude of 4100 m a.s.l. in Sierra Negra, Mexico. HAWC consists of 300 Water Cherenkov Detectors, each instrumented with 4 photomultiplier tubes (PMTs). HAWC re-uses the Front-End Boards from the Milagro experiment to receive the PMT signals. These boards are used in combination with Time to Digital Converters (TDCs) to record the time and the amount of light in each PMT hit (light flash). A set of VME TDC modules (128 channels each) is operated in a continuous (dead time free) mode. The TDCs are read out via the VME bus by Single-Board Computers (SBCs), which in turn are connected to a gigabit Ethernet network. The complete system produces ~ 500 MB/s of raw data. A high-throughput data processing system has been designed and built to enable real-time data analysis. The system relies on off-the-shelf hardware components, an open-source software technology for data transfers (ZeroMQ) and a custom software framework for data analysis (AERIE). Multiple trigger and reconstruction algorithms can be combined and run on blocks of data in a parallel fashion, producing a set of output data streams which can be analyzed in real time with minimal latency (< 5 s). This paper provides an overview of the hardware set-up and an in-depth description of the software design, covering both the TDC data acquisition system and the real-time data processing system. The performance of these systems is also discussed., Comment: 14 pages, 3 figures, submitted to Nucl. Instrum. Meth. A

Published
2017
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144. Spectral analysis of Markarian 421 and Markarian 501 with HAWC

Author

de León, S. Coutiño, Carramiñana, A., and Rosa-González, D.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

The Hight Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory monitors the gamma-ray sky in the energy range from 100 GeV to 100 TeV and has detected two very high energy (VHE) blazars: Markarian 421 (Mrk 421) and Markarian 501 (Mrk 501) in 1.5 years of observations. In this work, we present the spectral analysis above 1 TeV of both sources using a maximum likelihood method and an artificial neural network as an energy estimator. The main objectives are to constrain the spectral curvature of Mrk 421 and Mrk 501 at $\sim$5 TeV using the EBL models from Gilmore et al. (2012) and Franceschini et al. (2008)., Comment: Presented at the 35th International Cosmic Ray Conference (ICRC2017), Bexco, Busan, Korea. See arXiv:1708.02572 for all HAWC contributions

Published
2017

145. HAWC Contributions to the 35th International Cosmic Ray Conference (ICRC2017)

Author

Abeysekara, A. U., Albert, A., Alfaro, R., Alvarez, C., Álvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., Rojas, D. Avila, Solares, H. A. Ayala, Barber, A. S., Gonzalez, J. Becerra, Becerril, A., Belmont-Moreno, E., BenZvi, S. Y., Berley, D., Bernal, A., Brisbois, C., Caballero-Mora, K. S., Capistrán, T., Carramiñana, A., Casanova, S., Castillo, M., Cotti, U., Cotzomi, J., de León, S. Coutiño, De la Fuente, E., De León, C., DeYoung, T., Hernandez, R. Diaz, Diaz-Cruz, L., Díaz-Vélez, J. C., Dichiara, S., Dingus, B. L., DuVernois, M. A., Ellsworth, R. W., Engel, K., Enriquez-Rivera, O., Fick, B., Fiorino, D. W., Fleischhack, H., Flores, J. L., Fraija, N., García-González, J. A., Garcia-Luna, J. L., Garcia-Torales, G., Garfias, F., Gerhardt, M., González, M. M., Muñoz, A. González, Goodman, J. A., Gussert, M., Hampel-Arias, Z., Harding, J. P., Hernandez, S., Hernandez-Almada, A., Hinton, J., Hona, B., Hui, C. M., Hüntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kaufmann, S., Kieda, D., Kunde, G. J., Lara, A., Lauer, R. J., Lee, W. H., Lennarz, D., Vargas, H. León, Linnemann, J. T., Longinotti, A. L., Proper, M. Longo, López-Coto, R., Raya, G. Luis, Luna-García, R., Malone, K., Marandon, V., Marinelli, S. S., Martinez, O., Martinez-Castellanos, I., Martínez-Castro, J., Martínez-Huerta, H., Matthews, J. A. J., McEnery, J., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Pelayo, R., Pérez-Pérez, E. G., Pretz, J., Ren, Z., Rho, C. D., Rivière, C., Rosa-González, D., Rosenberg, M., Ruiz-Velasco, E., Ryan, J., Salazar, H., Greus, F. Salesa, Sandoval, A., Schneider, M., Schoorlemmer, H., Sinnis, G., Smith, A. J., Smith, A. W., Springer, R. W., Surajbali, P., Taboada, I., Tibolla, O., Tollefson, K., Torres, I., Ukwatta, T. N., Vianello, G., Weisgarber, T., Westerhoff, S., Wood, J., Yapici, T., Yodh, G. B., Younk, P. W., Zepeda, A., and Zhou, H.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Experiment
Abstract

List of proceedings from the HAWC Collaboration presented at the 35th International Cosmic Ray Conference, 12 July - 20 July 2017, Bexco, Busan, Korea., Comment: List of proceedings from the HAWC Collaboration presented at ICRC2017. Corrected typos in the index of the previous version. Follow the "HTML" link to access the list

Published
2017

146. Dark Matter Limits From Dwarf Spheroidal Galaxies with The HAWC Gamma-Ray Observatory

Author

Albert, A., Alfaro, R., Alvarez, C., Álvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., Rojas, D. Avila, Solares, H. A. Ayala, Bautista-Elivar, N., Becerril, A., Belmont-Moreno, E., BenZvi, S. Y., Bernal, A., Braun, J., Caballero-Mora, K. S., Capistrán, T., Carramiñana, A., Castillo, M., Cotti, U., De León, C., De la Fuente, E., Hernandez, R. Diaz, Dingus, B. L., DuVernois, M. A., Díaz-Vélez, J. C., Ellsworth, R. W., Fiorino, D. W., Fraija, N., García-González, J. A., Garfias, F., González, M. M., Goodman, J. A., Harding, J. P., Hernandez, S., Hernandez-Almada, A., Iriarte, A., Joshi, V., Kaufmann, S., Kieda, D., Lauer, R. J., Lennarz, D., Vargas, H. León, Linnemann, J. T., Longinotti, A. L., Raya, G. Luis, López-Coto, R., Malone, K., Marinelli, S. S., Martinez-Castellanos, I., Martínez-Castro, J., Martínez-Huerta, H., Matthews, J. A., Miranda-Romagnoli, P., Moreno, E., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Pelayo, R., Pretz, J., Pérez-Pérez, E. G., Ren, Z., Rho, C. D., Rivière, C., Rosa-González, D., Ruiz-Velasco, E., Greus, F. Salesa, Sandoval, A., Schneider, M., Schoorlemmer, H., Sinnis, G., Smith, A. J., Springer, R. W., Surajbali, P., Taboada, I., Tibolla, O., Tollefson, K., Torres, I., Weisgarber, T., Yapici, T., and Zhou, H.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Phenomenology
Abstract

The High Altitude Water Cherenkov (HAWC) gamma-ray observatory is a wide field of view observatory sensitive to 500 GeV - 100 TeV gamma rays and cosmic rays. It can also perform diverse indirect searches for dark matter (DM) annihilation and decay. Among the most promising targets for the indirect detection of dark matter are dwarf spheroidal galaxies. These objects are expected to have few astrophysical sources of gamma rays but high dark matter content, making them ideal candidates for an indirect dark matter detection with gamma rays. Here we present individual limits on the annihilation cross section and decay lifetime for 15 dwarf spheroidal galaxies within the HAWC field-of-view, as well as their combined limit. These are the first limits on the annihilation cross section and decay lifetime using data collected with HAWC., Comment: 18 pages, 6 figures, 2 tables

Published
2017
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147. Search for very-high-energy emission from Gamma-ray Bursts using the first 18 months of data from the HAWC Gamma-ray Observatory

Author

The HAWC collaboration, Alfaro, R., Alvarez, C., Álvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., Rojas, D. Avila, Solares, H. A. Ayala, Barber, A. S., Bautista-Elivar, N., Becerril, A., Belmont-Moreno, E., BenZvi, S. Y., Bernal, A., Braun, J., Brisbois, C., Caballero-Mora, K. S., Capistrán, T., Carramiñana, A., Casanova, S., Castillo, M., Cotti, U., Cotzomi, J., de León, S. Coutiño, de la Fuente, E., De León, C., DeYoung, T., Hernandez, R. Diaz, Dingus, B. L., DuVernois, M. A., Díaz-Vélez, J. C., Ellsworth, R. W., Engel, K., Fiorino, D. W., Fraija, N., García-González, J. A., Garfias, F., Gerhardt, M., Muñoz, A. González, González, M. M., Goodman, J. A., Hampel-Arias, Z., Harding, J. P., Hernandez-Almada, A., Hernandez, S., Hona, B., Hui, C. M., Hüntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kaufmann, S., Kieda, D., Lauer, R. J., Lee, W. H., Lennarz, D., Vargas, H. León, Linnemann, J. T., Longinotti, A. L., Raya, G. Luis, Luna-García, R., Malone, K., Marinelli, S. S., Martinez, O., Martinez-Castellanos, I., Martínez-Castro, J., Martínez-Huerta, H., Matthews, J. A., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nellen, L., Newbold, M., Noriega-Papaqui, R., Pelayo, R., Pérez-Pérez, E. G., Pretz, J., Ren, Z., Rho, C. D., Rivière, C., Rosa-González, D., Rosenberg, M., Ruiz-Velasco, E., Salazar, H., Greus, F. Salesa, Sandoval, A., Schneider, M., Schoorlemmer, H., Sinnis, G., Smith, A. J., Springer, R. W., Surajbali, P., Taboada, I., Tibolla, O., Tollefson, K., Torres, I., Ukwatta, T. N., Vianello, G., Weisgarber, T., Westerhoff, S., Wood, J., Yapici, T., Younk, P. W., Zepeda, A., and Zhou, H.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

The High Altitude Water Cherenkov (HAWC) Gamma-ray Observatory is an extensive air shower detector operating in central Mexico, which has recently completed its first two years of full operations. If for a burst like GRB 130427A at a redshift of 0.34 and a high-energy component following a power law with index -1.66, the high-energy component is extended to higher energies with no cut-off other than from extragalactic background light attenuation, HAWC would observe gamma rays with a peak energy of $\sim$300 GeV. This paper reports the results of HAWC observations of 64 gamma-ray bursts (GRBs) detected by $\mathit{Swift}$ and $\mathit{Fermi}$, including three GRBs that were also detected by the Large Area Telescope ($\mathit{Fermi}$-LAT). An ON/OFF analysis method is employed, searching on the time scale given by the observed light curve at keV-MeV energies and also on extended time scales. For all GRBs and time scales, no statistically significant excess of counts is found and upper limits on the number of gamma rays and the gamma-ray flux are calculated. GRB 170206A, the third brightest short GRB detected by the Gamma-ray Burst Monitor on board the $\mathit{Fermi}$ satellite ($\mathit{Fermi}$-GBM) and also detected by the LAT, occurred very close to zenith. The LAT measurements can neither exclude the presence of a synchrotron self-Compton (SSC) component nor constrain its spectrum. Instead, the HAWC upper limits constrain the expected cut-off in an additional high-energy component to be less than $100~\rm{GeV}$ for reasonable assumptions about the energetics and redshift of the burst., Comment: 19 pages, 6 figures, published in ApJ

Published
2017
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148. The HAWC real-time flare monitor for rapid detection of transient events

Author

Abeysekara, A. U., Alfaro, R., Alvarez, C., Álvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., Rojas, D. Avila, Solares, H. A. Ayala, Barber, A. S., Bautista-Elivar, N., Gonzalez, J. Becerra, Becerril, A., Belmont-Moreno, E., BenZvi, S. Y., Bernal, A., Braun, J., Brisbois, C., Caballero-Mora, K. S., Capistrán, T., Carramiñana, A., Casanova, S., Castillo, M., Cotti, U., Cotzomi, J., de León, S. Coutiño, De la Fuente, E., De León, C., Díaz-Vélez, J. C., Dingus, B. L., DuVernois, M. A., Ellsworth, R. W., Engel, K., Fiorino, D. W., Fraija, N., García-González, J. A., Garfias, F., Gerhardt, M., González, M. M., Muñoz, A. González, Goodman, J. A., Hampel-Arias, Z., Harding, J. P., Hernandez, S., Hernandez-Almada, A., Hona, B., Hui, C. M., Hüntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kaufmann, S., Kieda, D., Lauer, R. J., Lee, W. H., Lennarz, D., Vargas, H. León, Linnemann, J. T., Longinotti, A. L., López-Cámara, D., López-Coto, R., Raya, G. Luis, Luna-García, R., Malone, K., Marinelli, S. S., Martinez, O., Martinez-Castellanos, I., Martínez-Castro, J., Martínez-Huerta, H., Matthews, J. A., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Pelayo, R., Pérez-Pérez, E. G., Pretz, J., Ren, Z., Rho, C. D., Rivière, C., Rosa-González, D., Rosenberg, M., Ruiz-Velasco, E., Salazar, H., Greus, F. Salesa, Sandoval, A., Schneider, M., Schoorlemmer, H., Sinnis, G., Smith, A. J., Springer, R. W., Surajbali, P., Taboada, I., Tibolla, O., Tollefson, K., Torres, I., Ukwatta, T. N., Vianello, G., Weisgarber, T., Westerhoff, S., Wisher, I. G., Wood, J., Yapici, T., Younk, P. W., Zepeda, A., and Zhou, H.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

We present the development of a real-time flare monitor for the High Altitude Water Cherenkov (HAWC) observatory. The flare monitor has been fully operational since 2017 January and is designed to detect very high energy (VHE; $E\gtrsim100$ GeV) transient events from blazars on time scales lasting from 2 minutes to 10 hours in order to facilitate multiwavelength and multimessenger studies. These flares provide information for investigations into the mechanisms that power the blazars' relativistic jets and accelerate particles within them, and they may also serve as probes of the populations of particles and fields in intergalactic space. To date, the detection of blazar flares in the VHE range has relied primarily on pointed observations by imaging atmospheric Cherenkov telescopes. The recently completed HAWC observatory offers the opportunity to study VHE flares in survey mode, scanning 2/3 of the entire sky every day with a field of view of $\sim$1.8 steradians. In this work, we report on the sensitivity of the HAWC real-time flare monitor and demonstrate its capabilities via the detection of three high-confidence VHE events in the blazars Markarian 421 and Markarian 501., Comment: 19 pages, 14 figures, revised version submitted to The Astrophysical Journal on 1 June 2017

Published
2017
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149. Black hole astrophysics with HAWC, the High Altitude Water Cherenkov gamma-ray observatory

Author

Carramiñana, Alberto

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

The HAWC gamma-ray observatory is a wide field of view and high duty cycle $\gamma$-ray detector investigating the 0.1 - 100 TeV energy range. It has detected supermassive black holes in the near Universe, and is seeking to detect black hole related objects like gamma-ray bursts, Galactic binary systems, primordial black holes and gravitational wave mergers. Daily light curves of the BL Lac objects Mrk 421 and Mrk 501 are presented here, together with a compilation of studies of black hole related objects., Comment: Invited talk to IAU Symposium 324 "New Frontiers in Black Hole Astrophysics", Ljubljana, Slovenia 12-16 September 2016 - 8 pages, 3 figures

Published
2017
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150. Daily monitoring of TeV gamma-ray emission from Mrk 421, Mrk 501, and the Crab Nebula with HAWC

Author

Abeysekara, A. U., Albert, A., Alfaro, R., Alvarez, C., Álvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., Rojas, D. Avila, Solares, H. A. Ayala, Barber, A. S., Bautista-Elivar, N., Gonzalez, J. Becerra, Becerril, A., Belmont-Moreno, E., BenZvi, S. Y., Bernal, A., Braun, J., Brisbois, C., Caballero-Mora, K. S., Capistrán, T., Carramiñana, A., Casanova, S., Castillo, M., Cotti, U., Cotzomi, J., de León, S. Coutiño, De León, C., De la Fuente, E., Hernandez, R. Diaz, Dingus, B. L., DuVernois, M. A., Díaz-Vélez, J. C., Ellsworth, R. W., Engel, K., Fiorino, D. W., Fraija, N., García-González, J. A., Garfias, F., Gerhardt, M., Muñoz, A. González, González, M. M., Goodman, J. A., Hampel-Arias, Z., Harding, J. P., Hernandez, S., Hernandez-Almada, A., Hona, B., Hui, C. M., Hüntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kaufmann, S., Kieda, D., Lara, A., Lauer, R. J., Lee, W. H., Lennarz, D., Vargas, H. León, Linnemann, J. T., Longinotti, A. L., Raya, G. Luis, Luna-García, R., López-Coto, R., Malone, K., Marinelli, S. S., Martinez, O., Martinez-Castellanos, I., Martínez-Castro, J., Matthews, J. A., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Pretz, J., Pérez-Pérez, E. G., Ren, Z., Rho, C. D., Rivière, C., Rosa-González, D., Rosenberg, M., Ruiz-Velasco, E., Greus, F. Salesa, Sandoval, A., Schneider, M., Schoorlemmer, H., Sinnis, G., Smith, A. J., Springer, R. W., Surajbali, P., Taboada, I., Tibolla, O., Tollefson, K., Torres, I., Ukwatta, T. N., Vianello, G., Weisgarber, T., Westerhoff, S., Wisher, I. G., Wood, J., Yapici, T., Younk, P. W., Zepeda, A., and Zhou, H.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

We present results from daily monitoring of gamma rays in the energy range $\sim0.5$ to $\sim100$ TeV with the first 17 months of data from the High Altitude Water Cherenkov (HAWC) Observatory. Its wide field of view of 2 steradians and duty cycle of $>95$% are unique features compared to other TeV observatories that allow us to observe every source that transits over HAWC for up to $\sim6$ hours each sidereal day. This regular sampling yields unprecedented light curves from unbiased measurements that are independent of seasons or weather conditions. For the Crab Nebula as a reference source we find no variability in the TeV band. Our main focus is the study of the TeV blazars Markarian (Mrk) 421 and Mrk 501. A spectral fit for Mrk 421 yields a power law index $\Gamma=2.21 \pm0.14_{\mathrm{stat}}\pm0.20_{\mathrm{sys}}$ and an exponential cut-off $E_0=5.4 \pm 1.1_{\mathrm{stat}}\pm 1.0_{\mathrm{sys}}$ TeV. For Mrk 501, we find an index $\Gamma=1.60\pm 0.30_{\mathrm{stat}} \pm 0.20_{\mathrm{sys}}$ and exponential cut-off $E_0=5.7\pm 1.6_{\mathrm{stat}} \pm 1.0_{\mathrm{sys}}$ TeV. The light curves for both sources show clear variability and a Bayesian analysis is applied to identify changes between flux states. The highest per-transit fluxes observed from Mrk 421 exceed the Crab Nebula flux by a factor of approximately five. For Mrk 501, several transits show fluxes in excess of three times the Crab Nebula flux. In a comparison to lower energy gamma-ray and X-ray monitoring data with comparable sampling we cannot identify clear counterparts for the most significant flaring features observed by HAWC., Comment: 18 pages, 10 figures, accepted for publication in The Astrophysical Journal

Published
2017
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