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7 results on '"Vigorito CF"'

1. Study of the GeV to TeV morphology of the γ Cygni SNR (G 78.2+2.1) with MAGIC and Fermi-LAT: Evidence for cosmic ray escape

Author

Acciari, Va, Ansoldi, S, Antonelli, La, Engels, Aa, Baack, D, Babic, A, Banerjee, B, de Almeida, Ub, Barrio, Ja, Gonzalez, Jb, Bednarek, W, Bellizzi, L, Bernardini, E, Berti, A, Besenrieder, J, Bhattacharyya, W, Bigongiari, C, Biland, A, Blanch, O, Bonnoli, G, Bosnjak, Z, Busetto, G, Carosi, R, Ceribella, G, Cerruti, M, Chai, Y, Chilingarian, A, Cikota, S, Colak, Sm, Colin, U, Colombo, E, Contreras, Jl, Cortina, J, Covino, S, D'Elia, V, Da Vela, P, Dazzi, F, De Angelis, A, De Lotto, B, Delfino, M, Delgado, J, Depaoli, D, Di Pierro, F, Di Venere, L, Espineira, Ed, Prester, Dd, Donini, A, Dorner, D, Doro, M, Elsaesser, D, Ramazani, Vf, Fattorini, A, Ferrara, G, Foffano, L, Fonseca, Mv, Font, L, Fruck, C, Fukami, S, Lopez, Rjg, Garczarczyk, M, Gasparyan, S, Gaug, M, Giglietto, N, Giordano, F, Gliwny, P, Godinovic, N, Green, D, Hadasch, D, Hahn, A, Herrera, J, Hoang, J, Hrupec, D, Hutten, M, Inada, T, Inoue, S, Ishio, K, Iwamura, Y, Jouvin, L, Kajiwara, Y, Karjalainen, M, Kerszberg, D, Kobayashi, Y, Kubo, H, Kushida, J, Lamastra, A, Lelas, D, Leone, F, Lindfors, E, Lombardi, S, Longo, F, Lopez, M, Lopez-Coto, R, Lopez-Oramas, A, Loporchio, S, Fraga, Bmd, Masuda, S, Maggio, C, Majumdar, P, Makariev, M, Mallamaci, M, Maneva, G, Manganaro, M, Mannheim, K, Maraschi, L, Mariotti, M, Martinez, M, Mazin, D, Mender, S, Micanovic, S, Miceli, D, Miener, T, Minev, M, Miranda, Jm, Mirzoyan, R, Molina, E, Moralejo, A, Morcuende, D, Moreno, V, Moretti, E, Munar-Adrover, P, Neustroev, V, Nigro, C, Nilsson, K, Ninci, D, Nishijima, K, Noda, K, Nogues, L, Nozaki, S, Ohtani, Y, Oka, T, Otero-Santos, J, Palatiello, M, Paneque, D, Paoletti, R, Paredes, Jm, Pavletic, L, Penil, P, Peresano, M, Persic, M, Moroni, Pgp, Prandini, E, Puljak, I, Rhode, W, Ribo, M, Rico, J, Righi, C, Rugliancich, A, Saha, L, Sahakyan, N, Saito, T, Sakurai, S, Satalecka, K, Schleicher, B, Schmidt, K, Schweizer, T, Sitarek, J, Snidaric, I, Sobczynska, D, Spolon, A, Stamerra, A, Strom, D, Strzys, M, Suda, Y, Suric, T, Takahashi, M, Tavecchio, F, Temnikov, P, Terzic, T, Teshima, M, Torres-Alba, N, Tosti, L, van Scherpenberg, J, Vanzo, G, Acosta, Mv, Ventura, S, Verguilov, V, Vigorito, Cf, Vitale, V, Vovk, I, Will, M, Zaric, D, Celli, S, and Morlino, G

Subjects
Gamma rays: ISM, Acceleration of particles, Space and Planetary Science, Gamma rays: general, Cosmic rays, ISM: clouds, ISM: supernova remnants, Física nuclear, Astronomy and Astrophysics
Abstract

Context. Diffusive shock acceleration (DSA) is the most promising mechanism that accelerates Galactic cosmic rays (CRs) in the shocks of supernova remnants (SNRs). It is based on particles scattering caused by turbulence ahead and behind the shock. The turbulence upstream is supposedly generated by the CRs, but this process is not well understood. The dominant mechanism may depend on the evolutionary state of the shock and can be studied via the CRs escaping upstream into the interstellar medium (ISM). Aims. Previous observations of the γ Cygni SNR showed a difference in morphology between GeV and TeV energies. Since this SNR has the right age and is at the evolutionary stage for a significant fraction of CRs to escape, our aim is to understand γ-ray emission in the vicinity of the γ Cygni SNR. Methods. We observed the region of the γ Cygni SNR with the MAGIC Imaging Atmospheric Cherenkov telescopes between 2015 May and 2017 September recording 87 h of good-quality data. Additionally, we analysed Fermi-LAT data to study the energy dependence of the morphology as well as the energy spectrum in the GeV to TeV range. The energy spectra and morphology were compared against theoretical predictions, which include a detailed derivation of the CR escape process and their γ-ray generation. Results. The MAGIC and Fermi-LAT data allowed us to identify three emission regions that can be associated with the SNR and that dominate at different energies. Our hadronic emission model accounts well for the morphology and energy spectrum of all source components. It constrains the time-dependence of the maximum energy of the CRs at the shock, the time-dependence of the level of turbulence, and the diffusion coefficient immediately outside the SNR shock. While in agreement with the standard picture of DSA, the time-dependence of the maximum energy was found to be steeper than predicted, and the level of turbulence was found to change over the lifetime of the SNR.

Published
2023

2. Observation of the Gamma-Ray Binary HESS J0632+057 with the HESS, MAGIC, and VERITAS Telescopes

Author

Adams, Cb, Benbow, W, Brill, A, Buckley, Jh, Capasso, M, Chromey, Aj, Errando, M, Falcone, A, Farrell, Ka, Feng, Q, Finley, Jp, Foote, Gm, Fortson, L, Furniss, A, Gent, A, Gillanders, Gh, Giuri, C, Gueta, O, Hanna, D, Hassan, T, Hervet, O, Holder, J, Hona, B, Humensky, Tb, Jin, W, Kaaret, P, Kertzman, M, Kieda, D, Kleiner, Tk, Krennrich, F, Kumar, S, Lang, Mj, Lundy, M, Maier, G, Mcgrath, Ce, Moriarty, P, Mukherjee, R, Nieto, D, Nievas-Rosillo, M, O'Brien, S, Ong, Ra, Otte, An, Park, N, Patel, S, Pfrang, K, Pichel, A, Pohl, M, Prado, Rr, Quinn, J, Ragan, K, Reynolds, Pt, Ribeiro, D, Roache, E, Rovero, Ac, Ryan, Jl, Santander, M, Schlenstedt, S, Sembroski, Gh, Shang, R, Tak, D, Vassiliev, Vv, Weinstein, A, Williams, Da, Williamson, Tj, Acciari, Va, Ansoldi, S, Antonelli, La, Engels, Aa, Artero, M, Asano, K, Baack, D, Babic, A, Baquero, A, de Almeida, Ub, Barrio, Ja, Batkovic, I, Gonzalez, Jb, Bednarek, W, Bellizzi, L, Bernardini, E, Bernardos, M, Berti, A, Besenrieder, J, Bhattacharyya, W, Bigongiari, C, Biland, A, Blanch, O, Bokenkamp, H, Bonnoli, G, Busetto, G, Bosnjak, Z, Carosi, R, Ceribella, G, Cerruti, M, Chai, Y, Chilingarian, A, Cikota, S, Colak, Sm, Colombo, E, Contreras, Jl, Cortina, J, Covino, S, D'Amico, G, D'Elia, V, Da Vela, P, Dazzi, F, De Angelis, A, De Lotto, B, Delfino, M, Delgado, J, Mendez, Cd, Depaoli, D, Di Pierro, F, Di Venere, L, Espineira, Ed, Prester, Dd, Donini, A, Dorner, D, Doro, M, Elsaesser, D, Ramazani, Vf, Fattorini, A, Fonseca, Mv, Font, L, Fruck, C, Fukami, S, Fukazawa, Y, Lopez, Rjg, Garczarczyk, M, Gasparyan, S, Gaug, M, Giglietto, N, Giordano, F, Gliwny, P, Godinovic, N, Green, Jg, Green, D, Hadasch, D, Hahn, A, Heckmann, L, Herrera, J, Hoang, J, Hrupec, D, Hutten, M, Inada, T, Ishio, K, Iwamura, Y, Martinez, Ij, Jormanainen, J, Jouvin, L, Karjalainen, M, Kerszberg, D, Kobayashi, Y, Kubo, H, Kushida, J, Lamastra, A, Lelas, D, Leone, F, Lindfors, E, Linhoff, L, Lombardi, S, Longo, F, Lopez-Coto, R, Lopez-Moya, M, Lopez-Oramas, A, Loporchio, S, Fraga, Bmd, Maggio, C, Majumdar, P, Makariev, M, Mallamaci, M, Maneva, G, Manganaro, M, Mannheim, K, Maraschi, L, Mariotti, M, Martinez, M, Mazin, D, Menchiari, S, Mender, S, Micanovic, S, Miceli, D, Miener, T, Miranda, Jm, Mirzoyan, R, Molina, E, Moralejo, A, Morcuende, D, Moreno, V, Moretti, E, Nakamori, T, Nava, L, Neustroev, V, Nigro, C, Nilsson, K, Nishijima, K, Noda, K, Nozaki, S, Ohtani, Y, Oka, T, Otero-Santos, J, Paiano, S, Palatiello, M, Paneque, D, Paoletti, R, Paredes, Jm, Pavletic, L, Penil, P, Persic, M, Pihet, M, Moroni, Pgp, Prandini, E, Priyadarshi, C, Puljak, I, Rhode, W, Ribo, M, Rico, J, Righi, C, Rugliancich, A, Saha, L, Sahakyan, N, Saito, T, Sakurai, S, Satalecka, K, Saturni, Fg, Schleicher, B, Schmidt, K, Schweizer, T, Sitarek, J, Sobczynska, D, Spolon, A, Stamerra, A, Striskovic, J, Strom, D, Strzys, M, Suda, Y, Suric, T, Takahashi, M, Takeishi, R, Tavecchio, F, Temnikov, P, Terzic, T, Teshima, M, Tosti, L, Truzzi, S, Tutone, A, Ubach, S, van Scherpenberg, J, Vanzo, G, Acosta, Mv, Ventura, S, Verguilov, V, Vigorito, Cf, Vitale, V, Vovk, I, Will, M, Wunderlich, C, Yamamoto, T, Zaric, D, Abdalla, H, Aharonian, F, Benkhali, Fa, Anguner, Eo, Arcaro, C, Ashkar, H, Backes, M, Martins, Vb, Barnard, M, Batzofin, R, Becherini, Y, Berge, D, Bernlohr, K, Bi, B, Bottcher, M, Boisson, C, Bolmont, J, de Lavergne, Md, Breuhaus, M, Brose, R, Brun, F, Bulik, T, Caroff, S, Casanova, S, Chand, T, Chen, A, Cotter, G, Mbarubucyeye, Jd, Devin, J, Djannati-Atai, A, Egberts, K, Ernenwein, Jp, Fegan, S, Fiasson, A, de Clairfontaine, Gf, Fontaine, G, Fussling, M, Funk, S, Gabici, S, Giavitto, G, Glawion, D, Glicenstein, Jf, Grondin, Mh, Hinton, Ja, Hofmann, W, Holch, Tl, Holler, M, Horns, D, Huang, Zq, Jamrozy, M, Jankowsky, F, Joshi, V, Jung-Richardt, I, Kasai, E, Katarzynski, K, Khelifi, B, Komin, N, Kosack, K, Kostunin, D, Le Stum, S, Lemiere, A, Lenain, Jp, Leuschner, F, Levy, C, Lohse, T, Luashvili, A, Lypova, I, Mackey, J, Majumdar, J, Malyshev, D, Marandon, V, Marchegiani, P, Marcowith, A, Marti-Devesa, G, Marx, R, Maurin, G, Meintjes, Pj, Mitchell, A, Moderski, R, Mohrmann, L, Montanari, A, Moulin, E, Muller, J, Murach, T, de Naurois, M, Nayerhoda, A, Niemiec, J, Noel, Ap, O'Brien, P, Ohm, S, Olivera-Nieto, L, Wilhelmi, Ed, Ostrowski, M, Panny, S, Panter, M, Parsons, Rd, Peron, G, Poireau, V, Prokhorov, Da, Prokoph, H, Puhlhofer, G, Punch, M, Quirrenbach, A, Reichherzer, P, Reimer, A, Reimer, O, Renaud, M, Rieger, F, Romoli, C, Rowell, G, Rudak, B, Ricarte, Hr, Ruiz-Velasco, E, Sahakian, V, Sailer, S, Salzmann, H, Sanchez, Da, Santangelo, A, Sasaki, M, Schutte, Hm, Schwanke, U, Schussler, F, Senniappan, M, Shapopi, Jns, Simoni, R, Sol, H, Specovius, A, Spencer, S, Steenkamp, R, Steinmassl, S, Sun, L, Takahashi, T, Tanaka, T, Terrier, R, Tsuji, N, Uchiyama, Y, van Eldik, C, van Soelen, B, Veh, J, Venter, C, Vink, J, Wagner, Sj, White, R, Wierzcholska, A, Wong, Yw, Zacharias, M, Zargaryan, D, Zdziarski, Aa, Zech, A, Zhu, Sj, Zouari, S, Zywucka, N, Moritani, Y, Torres, Df, Adams, Cb, Benbow, W, Brill, A, Buckley, Jh, Capasso, M, Chromey, Aj, Errando, M, Falcone, A, Farrell, Ka, Feng, Q, Finley, Jp, Foote, Gm, Fortson, L, Furniss, A, Gent, A, Gillanders, Gh, Giuri, C, Gueta, O, Hanna, D, Hassan, T, Hervet, O, Holder, J, Hona, B, Humensky, Tb, Jin, W, Kaaret, P, Kertzman, M, Kieda, D, Kleiner, Tk, Krennrich, F, Kumar, S, Lang, Mj, Lundy, M, Maier, G, Mcgrath, Ce, Moriarty, P, Mukherjee, R, Nieto, D, Nievas-Rosillo, M, O'Brien, S, Ong, Ra, Otte, An, Park, N, Patel, S, Pfrang, K, Pichel, A, Pohl, M, Prado, Rr, Quinn, J, Ragan, K, Reynolds, Pt, Ribeiro, D, Roache, E, Rovero, Ac, Ryan, Jl, Santander, M, Schlenstedt, S, Sembroski, Gh, Shang, R, Tak, D, Vassiliev, Vv, Weinstein, A, Williams, Da, Williamson, Tj, Acciari, Va, Ansoldi, S, Antonelli, La, Engels, Aa, Artero, M, Asano, K, Baack, D, Babic, A, Baquero, A, de Almeida, Ub, Barrio, Ja, Batkovic, I, Gonzalez, Jb, Bednarek, W, Bellizzi, L, Bernardini, E, Bernardos, M, Berti, A, Besenrieder, J, Bhattacharyya, W, Bigongiari, C, Biland, A, Blanch, O, Bokenkamp, H, Bonnoli, G, Busetto, G, Bosnjak, Z, Carosi, R, Ceribella, G, Cerruti, M, Chai, Y, Chilingarian, A, Cikota, S, Colak, Sm, Colombo, E, Contreras, Jl, Cortina, J, Covino, S, D'Amico, G, D'Elia, V, Da Vela, P, Dazzi, F, De Angelis, A, De Lotto, B, Delfino, M, Delgado, J, Mendez, Cd, Depaoli, D, Di Pierro, F, Di Venere, L, Espineira, Ed, Prester, Dd, Donini, A, Dorner, D, Doro, M, Elsaesser, D, Ramazani, Vf, Fattorini, A, Fonseca, Mv, Font, L, Fruck, C, Fukami, S, Fukazawa, Y, Lopez, Rjg, Garczarczyk, M, Gasparyan, S, Gaug, M, Giglietto, N, Giordano, F, Gliwny, P, Godinovic, N, Green, Jg, Green, D, Hadasch, D, Hahn, A, Heckmann, L, Herrera, J, Hoang, J, Hrupec, D, Hutten, M, Inada, T, Ishio, K, Iwamura, Y, Martinez, Ij, Jormanainen, J, Jouvin, L, Karjalainen, M, Kerszberg, D, Kobayashi, Y, Kubo, H, Kushida, J, Lamastra, A, Lelas, D, Leone, F, Lindfors, E, Linhoff, L, Lombardi, S, Longo, F, Lopez-Coto, R, Lopez-Moya, M, Lopez-Oramas, A, Loporchio, S, Fraga, Bmd, Maggio, C, Majumdar, P, Makariev, M, Mallamaci, M, Maneva, G, Manganaro, M, Mannheim, K, Maraschi, L, Mariotti, M, Martinez, M, Mazin, D, Menchiari, S, Mender, S, Micanovic, S, Miceli, D, Miener, T, Miranda, Jm, Mirzoyan, R, Molina, E, Moralejo, A, Morcuende, D, Moreno, V, Moretti, E, Nakamori, T, Nava, L, Neustroev, V, Nigro, C, Nilsson, K, Nishijima, K, Noda, K, Nozaki, S, Ohtani, Y, Oka, T, Otero-Santos, J, Paiano, S, Palatiello, M, Paneque, D, Paoletti, R, Paredes, Jm, Pavletic, L, Penil, P, Persic, M, Pihet, M, Moroni, Pgp, Prandini, E, Priyadarshi, C, Puljak, I, Rhode, W, Ribo, M, Rico, J, Righi, C, Rugliancich, A, Saha, L, Sahakyan, N, Saito, T, Sakurai, S, Satalecka, K, Saturni, Fg, Schleicher, B, Schmidt, K, Schweizer, T, Sitarek, J, Sobczynska, D, Spolon, A, Stamerra, A, Striskovic, J, Strom, D, Strzys, M, Suda, Y, Suric, T, Takahashi, M, Takeishi, R, Tavecchio, F, Temnikov, P, Terzic, T, Teshima, M, Tosti, L, Truzzi, S, Tutone, A, Ubach, S, van Scherpenberg, J, Vanzo, G, Acosta, Mv, Ventura, S, Verguilov, V, Vigorito, Cf, Vitale, V, Vovk, I, Will, M, Wunderlich, C, Yamamoto, T, Zaric, D, Abdalla, H, Aharonian, F, Benkhali, Fa, Anguner, Eo, Arcaro, C, Ashkar, H, Backes, M, Martins, Vb, Barnard, M, Batzofin, R, Becherini, Y, Berge, D, Bernlohr, K, Bi, B, Bottcher, M, Boisson, C, Bolmont, J, de Lavergne, Md, Breuhaus, M, Brose, R, Brun, F, Bulik, T, Caroff, S, Casanova, S, Chand, T, Chen, A, Cotter, G, Mbarubucyeye, Jd, Devin, J, Djannati-Atai, A, Egberts, K, Ernenwein, Jp, Fegan, S, Fiasson, A, de Clairfontaine, Gf, Fontaine, G, Fussling, M, Funk, S, Gabici, S, Giavitto, G, Glawion, D, Glicenstein, Jf, Grondin, Mh, Hinton, Ja, Hofmann, W, Holch, Tl, Holler, M, Horns, D, Huang, Zq, Jamrozy, M, Jankowsky, F, Joshi, V, Jung-Richardt, I, Kasai, E, Katarzynski, K, Khelifi, B, Komin, N, Kosack, K, Kostunin, D, Le Stum, S, Lemiere, A, Lenain, Jp, Leuschner, F, Levy, C, Lohse, T, Luashvili, A, Lypova, I, Mackey, J, Majumdar, J, Malyshev, D, Marandon, V, Marchegiani, P, Marcowith, A, Marti-Devesa, G, Marx, R, Maurin, G, Meintjes, Pj, Mitchell, A, Moderski, R, Mohrmann, L, Montanari, A, Moulin, E, Muller, J, Murach, T, de Naurois, M, Nayerhoda, A, Niemiec, J, Noel, Ap, O'Brien, P, Ohm, S, Olivera-Nieto, L, Wilhelmi, Ed, Ostrowski, M, Panny, S, Panter, M, Parsons, Rd, Peron, G, Poireau, V, Prokhorov, Da, Prokoph, H, Puhlhofer, G, Punch, M, Quirrenbach, A, Reichherzer, P, Reimer, A, Reimer, O, Renaud, M, Rieger, F, Romoli, C, Rowell, G, Rudak, B, Ricarte, Hr, Ruiz-Velasco, E, Sahakian, V, Sailer, S, Salzmann, H, Sanchez, Da, Santangelo, A, Sasaki, M, Schutte, Hm, Schwanke, U, Schussler, F, Senniappan, M, Shapopi, Jn, Simoni, R, Sol, H, Specovius, A, Spencer, S, Steenkamp, R, Steinmassl, S, Sun, L, Takahashi, T, Tanaka, T, Terrier, R, Tsuji, N, Uchiyama, Y, van Eldik, C, van Soelen, B, Veh, J, Venter, C, Vink, J, Wagner, Sj, White, R, Wierzcholska, A, Wong, Yw, Zacharias, M, Zargaryan, D, Zdziarski, Aa, Zech, A, Zhu, Sj, Zouari, S, Zywucka, N, Moritani, Y, and Torres, Df

Subjects
Gamma ray, binaries
Abstract

The results of gamma-ray observations of the binary system HESS J0632 + 057 collected during 450 hr over 15 yr, between 2004 and 2019, are presented. Data taken with the atmospheric Cherenkov telescopes H.E.S.S., MAGIC, and VERITAS at energies above 350 GeV were used together with observations at X-ray energies obtained with Swift-XRT, Chandra, XMM-Newton, NuSTAR, and Suzaku. Some of these observations were accompanied by measurements of the H alpha emission line. A significant detection of the modulation of the very high-energy gamma-ray fluxes with a period of 316.7 +/- 4.4 days is reported, consistent with the period of 317.3 +/- 0.7 days obtained with a refined analysis of X-ray data. The analysis of data from four orbital cycles with dense observational coverage reveals short-timescale variability, with flux-decay timescales of less than 20 days at very high energies. Flux variations observed over a timescale of several years indicate orbit-to-orbit variability. The analysis confirms the previously reported correlation of X-ray and gamma-ray emission from the system at very high significance, but cannot find any correlation of optical H alpha parameters with fluxes at X-ray or gamma-ray energies in simultaneous observations. The key finding is that the emission of HESS J0632 + 057 in the X-ray and gamma-ray energy bands is highly variable on different timescales. The ratio of gamma-ray to X-ray flux shows the equality or even dominance of the gamma-ray energy range. This wealth of new data is interpreted taking into account the insufficient knowledge of the ephemeris of the system, and discussed in the context of results reported on other gamma-ray binary systems.

Published
2021

3. First detection of VHE gamma-ray emission from TXS 1515-273, study of its X-ray variability and spectral energy distribution

Author

M. I. Martínez, V. Neustroev, Francesco Longo, Maria-Isabel Bernardos, Alessandro Marchini, Alicia Fattorini, Tomohiko Oka, Katsuaki Asano, U. Barres de Almeida, Damir Lelas, Adrian Biland, D. Hadasch, D. Miceli, Sanae Inoue, Giacomo D'Amico, Yating Chai, Stefan Cikota, Pawel Gliwny, I. Vovk, David A. Green, R. J. García López, Narek Sahakyan, Stefano Covino, Lea Heckmann, Francesco Gabriele Saturni, J. Becerra González, Armin Nabizadeh, F. D'Ammando, J. Rico, M. Vazquez Acosta, Nicola Giglietto, Alexander Hahn, Nikola Godinovic, Dorota Sobczyńska, G. Ferrara, G. Busetto, E. Molina, Satoshi Fukami, Shunsuke Sakurai, Jarred Gershon Green, Elisabetta Bissaldi, C. Perennes, D. Strom, Yusuke Suda, E. Colombo, Lab Saha, Alice Donini, Kazuma Ishio, Massimo Persic, L. A. Antonelli, Martin Makariev, Dominik Baack, P. G. Prada Moroni, J. Kushida, Ivica Puljak, Victor Moreno, Oscar Blanch, S. Ventura, C. Nigro, Carlo Vigorito, F. Leone, D. Dominis Prester, Alessandra Lamastra, J. A. Barrio, John Hoang, V. Verguilov, Tomoki Saito, J. M. Paredes, Antonio Stamerra, Giovanni Ceribella, Rodolfo Carosi, I. Jiménez, V. D'Elia, Pratik Majumdar, M. V. Fonseca, Daniel Morcuende, Jose Luis Contreras, Jenni Jormanainen, Vincenzo Vitale, T. Schweizer, A. Arbet Engels, S. Loporchio, A. Rugliancich, Marina Manganaro, A. De Angelis, M. Karjalainen, Sargis Gasparyan, Stefano Menchiari, Y. Kajiwara, Fabrizio Tavecchio, M. Palatiello, Manuela Mallamaci, Masahiro Teshima, S. Paiano, Luca Tosti, I. Snidaric, Mosè Mariotti, Martin Will, M. Orienti, S. Mićanović, Ashot Chilingarian, Wolfgang Rhode, Lluis Font, B. Machado de Oliveira Fraga, Tihomir Surić, Manuel Artero, Juan Cortina, Toshiaki Inada, Yuki Iwamura, Stefano Truzzi, D. Zarić, Saverio Lombardi, Francesco Dazzi, Simone Mender, E. Do Souto Espiñeira, Tomislav Terzić, Dario Hrupec, Pablo Peñil, Konstancja Satalecka, L. Maraschi, Giacomo Bonnoli, Sidika Merve Colak, Elina Lindfors, Marcos López-Moya, G. Maneva, Karl Mannheim, Wlodek Bednarek, L. Di Venere, Mitsunari Takahashi, Michele Doro, J. van Scherpenberg, Stefano Ansoldi, Daniel Mazin, Riccardo Paoletti, Christian Fruck, Ivana Batković, E. Prandini, Wrijupan Bhattacharyya, Julian Sitarek, Santiago Ubach, Y. Kobayashi, F. Di Pierro, Jürgen Besenrieder, Lorenzo Bellizzi, Francesco Giordano, Antonio Tutone, J. Otero-Santos, K. Nishijima, Jose Miguel Miranda, Kai Phillip Schmidt, A. Berti, Yoshiki Ohtani, Tjark Miener, David Paneque, D. Elsaesser, Jordi Delgado, Ž. Bošnjak, Matteo Cerruti, Chiara Righi, V. Fallah Ramazani, V. A. Acciari, P. Temnikov, P. Da Vela, Manuel Delfino, Lovro Pavletić, Moritz Hütten, Chaitanya Priyadarshi, Carolin Wunderlich, Ana Babić, C. Delgado Mendez, M. Strzys, Kari Nilsson, Camilla Maggio, Daniela Dorner, Gaia Vanzo, M. Gaug, J. Herrera, Koji Noda, Elisa Bernardini, Alessia Spolon, Léa Jouvin, A. López-Oramas, S. Cutini, Daniel Kerszberg, Marc Ribó, B. De Lotto, S. Nozaki, Andrés Baquero, Hidetoshi Kubo, Abelardo Moralejo, E. Moretti, D. Depaoli, Bernd Schleicher, M. Minev, R. Mirzoyan, Ciro Bigongiari, M. Garczarczyk, R. López-Coto, German Research Foundation, Swiss National Science Foundation, Ministerio de Ciencia, Innovación y Universidades (España), Department of Atomic Energy (India), Institute for Cosmic Ray Research (Japan), University of Tokyo, Japan Society for the Promotion of Science, Ministry of Education, Culture, Sports, Science and Technology (Japan), Ministry of Education and Research (Romania), Academy of Finland, La Caixa, Croatian Science Foundation, University of Rijeka, Polish National Agency for Academic Exchange, European Commission, Ministerio de Economía y Competitividad (España), Istituto Nazionale di Astrofisica, Acciari, Va, Ansoldi, S, Antonelli, La, Engels, Aa, Artero, M, Asano, K, Baack, D, Babic, A, Baquero, A, de Almeida, Ub, Barrio, Ja, Batkovic, I, Gonzalez, Jb, Bednarek, W, Bellizzi, L, Bernardini, E, Bernardos, M, Berti, A, Besenrieder, J, Bhattacharyya, W, Bigongiari, C, Biland, A, Blanch, O, Bosnjak, Z, Busetto, G, Carosi, R, Ceribell, G, Cerruti, M, Chai, Y, Chilingarian, A, Cikota, S, Colak, Sm, Colombo, E, Contreras, Jl, Cortina, J, Covino, S, D'Amico, G, D'Elia, V, Da Vela, P, Dazzi, F, De Angelis, A, De Lotto, B, Delfino, M, Delgado, J, Mendez, Cd, Depaoli, D, Di Pierro, F, Di Venere, L, Espineira, Ed, Prester, Dd, Donini, A, Dorner, D, Doro, M, Elsaesser, D, Ramazani, Vf, Fattorini, A, Ferrara, G, Fonseca, Mv, Font, L, Fruck, C, Fukami, S, Lopez, Rjg, Garczarczyk, M, Gasparyan, S, Gaug, M, Giglietto, N, Giordano, F, Gliwny, P, Godinovic, N, Green, Jg, Green, D, Hadasch, D, Hahn, A, Heckmann, L, Herrera, J, Hoang, J, Hrupec, D, Hutten, M, Inada, T, Inoue, S, Ishio, K, Iwamura, Y, Jimenez, I, Jormanainen, J, Jouvin, L, Kajiwara, Y, Karjalainen, M, Kerszberg, D, Kobayashi, Y, Kubo, H, Kushida, J, Lamastra, A, Lelas, D, Leone, F, Lindfors, E, Lombardi, S, Longo, F, Lopez-Coto, R, Lopez-Moya, M, Lopez-Oramas, A, Loporchio, S, Fraga, Bmd, Maggio, C, Majumdar, P, Makariev, M, Mallamaci, M, Maneva, G, Manganaro, M, Mannheim, K, Maraschi, L, Mariotti, M, Martinez, M, Mazin, D, Menchiari, S, Mender, S, Micanovic, S, Miceli, D, Miener, T, Minev, M, Miranda, Jm, Mirzoyan, R, Molina, E, Moralejo, A, Morcuende, D, Moreno, V, Moretti, E, Neustroev, V, Nigro, C, Nilsson, K, Nishijima, K, Noda, K, Nozaki, S, Ohtani, Y, Oka, T, Otero-Santos, J, Paiano, S, Palatiello, M, Paneque, D, Paoletti, R, Paredes, Jm, Pavletic, L, Penil, P, Perennes, C, Moroni, Pgp, Prandini, E, Priyadarshi, C, Puljak, I, Rhode, W, Ribo, M, Rico, J, Righi, C, Rugliancich, A, Saha, L, Sahakyan, N, Saito, T, Sakurai, S, Satalecka, K, Saturni, Fg, Schleicher, B, Schmidt, K, Schweizer, T, Sitarek, J, Snidaric, I, Sobczynska, D, Spolon, A, Stamerra, A, Strom, D, Strzys, M, Suda, Y, Suric, T, Takahashi, M, Tavecchio, F, Temnikov, P, Terzic, T, Teshima, M, Tosti, L, Truzzi, S, Tutone, A, Ubach, S, Vanscherpenberg, J, Vanzo, G, Acosta, Mv, Ventura, S, Verguilov, V, Vigorito, Cf, Vitale, V, Vovk, I, Will, M, Wunderlich, C, Zaric, D, Bissaldi, E, Bonnoli, G, Cutini, S, D'Ammando, F, Nabizadeh, A, Marchini, A, and Orienti, M

Subjects
Photon, 010504 meteorology & atmospheric sciences, active [Galaxies], Radiation mechanisms: non-thermal, Astrophysics::High Energy Astrophysical Phenomena, galaxies: active, Objects: individual: TXS 1515–273, FOS: Physical sciences, Flux, Astrophysics, 01 natural sciences, 7. Clean energy, law.invention, law, objects: individual: TXS 1515-273, 0103 physical sciences, individual: TXS 1515-273 [Objects], MAGIC (telescope), Blazar, 010303 astronomy & astrophysics, 0105 earth and related environmental sciences, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, non-thermal [Radiation mechanisms], individual: TXS 1515–273 [objects], Gamma ray, Astronomy and Astrophysics, Synchrotron, Crab Nebula, Space and Planetary Science, ddc:520, Spectral energy distribution, Física nuclear, objects: individual: TXS 1515–273, Astrophysics - High Energy Astrophysical Phenomena
Abstract

Full list of authors: Acciari, V. A.; Ansoldi, S.; Antonelli, L. A.; Arbet Engels, A. ; Artero, M.; Asano, K.; Baack, D.; Babić, A.; Baquero, A.; Barres de Almeida, U.; Barrio, J. A.; Batković, I.; Becerra González, J.; Bednarek, W.; Bellizzi, L.; Bernardini, E.; Bernardos, M.; Berti, A.; Besenrieder, J.; Bhattacharyya, W.; Bigongiari, C.; Biland, A.; Blanch, O.; Bošnjak, Ž.; Busetto, G.; Carosi, R.; Ceribella, G.; Cerruti, M.; Chai, Y.; Chilingarian, A.; Cikota, S.; Colak, S. M.; Colombo, E.; Contreras, J. L.; Cortina, J.; Covino, S.; D'Amico, G.; D'Elia, V.; da Vela, P.; Dazzi, F.; de Angelis, A.; de Lotto, B.; Delfino, M.; Delgado, J.; Delgado Mendez, C.; Depaoli, D.; Pierro, F. Di; Venere, L. Di; Do Souto Espiñeira, E.; Dominis Prester, D.; Donini, A.; Dorner, D.; Doro, M.; Elsaesser, D.; Fallah Ramazani, V.; Fattorini, A.; Ferrara, G.; Fonseca, M. V.; Font, L.; Fruck, C.; Fukami, S.; García López, R. J.; Garczarczyk, M.; Gasparyan, S.; Gaug, M.; Giglietto, N.; Giordano, F.; Gliwny, P.; Godinović, N.; Green, J. G.; Green, D.; Hadasch, D.; Hahn, A.; Heckmann, L.; Herrera, J.; Hoang, J.; Hrupec, D.; Hütten, M.; Inada, T.; Inoue, S.; Ishio, K.; Iwamura, Y.; Jiménez, I.; Jormanainen, J.; Jouvin, L.; Kajiwara, Y.; Karjalainen, M.; Kerszberg, D.; Kobayashi, Y.; Kubo, H.; Kushida, J.; Lamastra, A.; Lelas, D.; Leone, F.; Lindfors, E.; Lombardi, S.; Longo, F.; López-Coto, R.; López-Moya, M.; López-Oramas, A.; Loporchio, S.; Machado de Oliveira Fraga, B.; Maggio, C.; Majumdar, P.; Makariev, M.; Mallamaci, M.; Maneva, G.; Manganaro, M.; Mannheim, K.; Maraschi, L.; Mariotti, M.; Martínez, M.; Mazin, D.; Menchiari, S.; Mender, S.; Mićanović, S.; Miceli, D.; Miener, T.; Minev, M.; Miranda, J. M.; Mirzoyan, R.; Molina, E.; Moralejo, A.; Morcuende, D.; Moreno, V.; Moretti, E.; Neustroev, V.; Nigro, C.; Nilsson, K.; Nishijima, K.; Noda, K.; Nozaki, S.; Ohtani, Y.; Oka, T.; Otero-Santos, J.; Paiano, S.; Palatiello, M.; Paneque, D.; Paoletti, R.; Paredes, J. M.; Pavletić, L.; Peñil, P.; Perennes, C.; Persic, M.; Prada Moroni, P. G.; Prandini, E.; Priyadarshi, C.; Puljak, I.; Rhode, W.; Ribó, M.; Rico, J.; Righi, C.; Rugliancich, A.; Saha, L.; Sahakyan, N.; Saito, T.; Sakurai, S.; Satalecka, K.; Saturni, F. G.; Schleicher, B.; Schmidt, K.; Schweizer, T.; Sitarek, J.; Šnidarić, I.; Sobczynska, D.; Spolon, A.; Stamerra, A.; Strom, D.; Strzys, M.; Suda, Y.; Surić, T.; Takahashi, M.; Tavecchio, F.; Temnikov, P.; Terzić, T.; Teshima, M.; Tosti, L.; Truzzi, S.; Tutone, A.; Ubach, S.; van Scherpenberg, J.; Vanzo, G.; Vazquez Acosta, M.; Ventura, S.; Verguilov, V.; Vigorito, C. F.; Vitale, V.; Vovk, I.; Will, M.; Wunderlich, C.; Zarić, D.; Bissaldi, E.; Bonnoli, G.; Cutini, S.; D'Ammando, F.; Nabizadeh, A.; Marchini, A.; Orienti, M.; MAGIC Collaboration., We report here on the first multiwavelength (MWL) campaign on the blazar TXS 1515-273, undertaken in 2019 and extending from radio to very-high-energy gamma-rays (VHE). Up until now, this blazar had not been the subject of any detailed MWL observations. It has a rather hard photon index at GeV energies and was considered a candidate extreme high-synchrotron-peaked source. MAGIC observations resulted in the first-time detection of the source in VHE with a statistical significance of 7.6σ. The average integral VHE flux of the source is 6 ± 1 per cent of the Crab nebula flux above 400 GeV. X-ray coverage was provided by Swift-XRT, XMM-Newton, and NuSTAR. The long continuous X-ray observations were separated by ∼9 h, both showing clear hour scale flares. In the XMM-Newton data, both the rise and decay time-scales are longer in the soft X-ray than in the hard X-ray band, indicating the presence of a particle cooling regime. The X-ray variability time-scales were used to constrain the size of the emission region and the strength of the magnetic field. The data allowed us to determine the synchrotron peak frequency and classify the source as a flaring high, but not extreme synchrotron-peaked object. Considering the constraints and variability patterns from the X-ray data, we model the broad-band spectral energy distribution. We applied a simple one-zone model, which could not reproduce the radio emission and the shape of the optical emission, and a two-component leptonic model with two interacting components, enabling us to reproduce the emission from radio to VHE band. © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society., The financial support of the German BMBF, MPG, and HGF; the Italian INFN and INAF; the Swiss National Fund SNF; the ERDF under the Spanish Ministerio de Ciencia e Innovacion (MICINN) (FPA201787859-P, FPA2017-85668-P, FPA2017-82729-C6-5-R, FPA201790566-REDC, PID2019-104114RB-C31, PID2019-104114RB-C32, PID2019-105510GB-C31, PID2019-107847RB-C41, PID2019107847RB-C42, PID2019-107847RB-C44, PID2019-107988GBC22); the Indian Department of Atomic Energy; the Japanese ICRR, the University of Tokyo, JSPS, and MEXT; the Bulgarian Ministry of Education and Science, National RI Roadmap Project DO1268/16.12.2019 and the Academy of Finland grant nr. 317637 and 320045 are gratefully acknowledged. This work was also supported by the Spanish Centro de Excelencia `Severo Ochoa' SEV-20160588, SEV-2017-0709 and CEX2019-000920-S, and `Maria de Maeztu' CEX2019-000918-M, the Unidad de Excelencia `Maria de Maeztu' MDM-2015-0509-18-2 and the `la Caixa' Foundation (fellowshipLCF/BQ/PI18/11630012), by the Croatian Science Foundation (HrZZ) Project IP-2016-06-9782 and the University of Rijeka Project 13.12.1.3.02, by the DFG Collaborative Research Centers SFB823/C4 and SFB876/C3, the Polish National Research Centre grant UMO-2016/22/M/ST9/00382 and by the Brazilian MCTIC, CNPq, and FAPERJ. The Fermi-LAT Collaboration acknowledges generous ongoing support from a number of agencies and institutes that have supported both the development and the operation of the LAT as well as scientific data analysis. These include the National Aeronautics and Space Administration and the Department of Energy in the United States, theCommissariat à l'Energie Atomique and the Centre National de la Recherche Scientifique/Institut National de Physique Nucleaire et de Physique des Particules in France, the Agenzia Spaziale Italiana and the Istituto Nazionale di Fisica Nucleare in Italy, the Ministry of Education, Culture, Sports, Science and Technology (MEXT), High Energy Accelerator Research Organization (KEK) and Japan Aerospace Exploration Agency (JAXA) in Japan, and the K. A. Wallenberg Foundation, the Swedish Research Council and the Swedish National Space Board in Sweden. Additional support for science analysis during the operations phase from the following agencies is also gratefully acknowledged: the Istituto Nazionale di Astrofisica in Italy and the Centre National d'Etudes Spatiales in France.

Published
2021

4. Multiwavelength variability and correlation studies of Mrk 421 during historically low X-ray and γ-ray activity in 2015-2016

Author

Banerjee, B., Terzić, T., Paneque, D., Majumdar, P., Acciari, V. A., Ansoldi, S., Antonelli, L. A., Artero, M., Asano, K., Babić, A., Banrje, B., Baquero, A., Barres Almeida, U., Barrio, J. A., Batković, I., Becerra González, J., Bednarek, W., Bellizzi, L., Bernardini, E., Bernardos, M., Berti, A., Besenrieder, J., Bhattacharyya, W., Bigongiari, C., Blanch, O., Bökenkamp, H., Bonnoli, G., Bošnjak, Ž, Busetto, G., Carosi, R., Ceribella, G., Cerruti, M., Chai, Y., Chilingarian, A., Cikota, S., Colak, S. M., Colombo, E., Contreras, J. L., Cortina, J., Covino, S., Giacomo D'Amico, D’elia, V., Da Vela, P., Dazzi, F., Angelis, A., Lotto, B., Delfino, M., Delgado, J., Delgado Mendez, C., Depaoli, D., Di Pierro, F., Di Venere, L., Do Souto Espiñeira, E., Dominis Prester, D., Donini, A., Doro, M., Fallah Ramazani, V., Fattorini, A., Fonseca, M. V., Font, L., Fruck, C., Fukami, S., Fukazawa, Y., García López, R. J., Garczarczyk, M., Gasparyan, S., Gaug, M., Giglietto, N., Giordano, F., Gliwny, P., Godinović, N., Green, J. G., Green, D., Hadasch, D., Hahn, A., Heckmann, L., Herrera, J., Hoang, J., Hrupec, D., Hütten, M., Inada, T., Ishio, K., Iwamura, Y., Jiménez Martínez, I., Jormanainen, J., Jouvin, L., Karjalainen, M., Kerszberg, D., Kobayashi, Y., Kubo, H., Kushida, J., Lamastra, A., Lelas, D., Leone, F., Lindfors, E., Linhoff, L., Lombardi, S., Longo, F., López-Coto, R., López-Moya, M., López-Oramas, A., Loporchio, S., Machado Oliveira Fraga, B., Maggio, C., Righini, S., Makariev, M., Mallamaci, M., Maneva, G., Manganaro, M., Maraschi, L., Mariotti, M., Martínez, M., Mazin, D., Menchiari, S., Mender, S., Mićanović, S., Miceli, D., Miener, T., Miranda, J. M., Mirzoyan, R., Molina, E., Moralejo, A., Morcuende, D., Moreno, V., Moretti, E., Nakamori, T., Nava, L., Neustroev, V., Nigro, C., Nilsson, K., Nishijima, K., Noda, K., Nozaki, S., Ohtani, Y., Oka, T., Otero-Santos, J., Paiano, S., Palatiello, M., Vera, R. J. C., Paoletti, R., Paredes, J. M., Pavletić, L., Peñil, P., Persic, M., Pihet, M., Prada Moroni, P. G., Prandini, E., Priyadarshi, C., Puljak, I., Ribó, M., Rico, J., Righi, C., Rugliancich, A., Sahakyan, N., Saito, T., Sakurai, S., Satalecka, K., Saturni, F. G., Lien, A. Y., Schmidt, K., Schweizer, T., Sitarek, J., Šnidarić, I., Sobczynska, D., Spolon, A., Stamerra, A., Strišković, J., Strom, D., Strzys, M., Suda, Y., Surić, T., Takahashi, M., Takeishi, R., Tavecchio, F., Temnikov, P., Järvelä, E., Teshima, M., Tosti, L., Truzzi, S., Tutone, A., Ubach, S., Scherpenberg, J., Vanzo, G., Vazquez Acosta, M., Ventura, S., Verguilov, V., Vigorito, C. F., Vitale, V., Vovk, I., Will, M., Wunderlich, C., Yamamoto, T., Zarić, D., Arbet-Engels, A., Baack, D., Balbo, M., Biland, A., Bretz, T., Buss, J., Dorner, D., Eisenberger, L., Elsaesser, D., Hildebrand, D., Iotov, R., Kalenski, A., Mannheim, K., Mitchell, A., Neise, D., Noethe, M., Paravac, A., Rhode, W., Schleicher, B., Sliusar, V., Walter, R., Valverde, J., Horan, D., Giroletti, M., Perri, M., Verrecchia, F., Leto, C., Sadun, A. C., Moody, J. W., Joner, M., Marscher, A. P., Jorstad, S. G., Lähteenmäki, A., Tornikoski, M., Ramakrishnan, V., Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), MAGIC, ITA, USA, GBR, DEU, ARM, BRA, CHL, HRV, FIN, JPN, IND, POL, RUS, CHE, German Research Foundation, Istituto Nazionale di Fisica Nucleare, Istituto Nazionale di Astrofisica, Swiss National Science Foundation, Ministerio de Ciencia, Innovación y Universidades (España), Ministerio de Economía y Competitividad (España), Department of Atomic Energy (India), Japan Society for the Promotion of Science, Ministry of Education, Culture, Sports, Science and Technology (Japan), Ministry of Education, Youth and Science (Bulgaria), Academy of Finland, University of Tokyo, La Caixa, University of Rijeka, Polish National Agency for Academic Exchange, Ministério da Ciência e Tecnologia (Brasil), Croatian Science Foundation, Department of Electronics and Nanoengineering, Metsähovi Radio Observatory, Aalto-yliopisto, Aalto University, Acciari, Va, Ansoldi, S, Antonelli, La, Asano, K, Babic, A, Banerjee, B, Baquero, A, de Almeida, Ub, Barrio, Ja, Gonzalez, Jb, Bednarek, W, Bellizzi, L, Bernardini, E, Bernardos, M, Berti, A, Besenrieder, J, Bhattacharyya, W, Bigongiari, C, Blanch, O, Bonnoli, G, Bosnjak, Z, Busetto, G, Carosi, R, Ceribella, G, Cerruti, M, Chai, Y, Chilingarian, A, Cikota, S, Colak, Sm, Colombo, E, Contreras, Jl, Cortina, J, Covino, S, D'Amico, G, D'Elia, V, Da Vela, P, Dazzi, F, De Angelis, A, De Lotto, B, Delfino, M, Delgado, J, Mendez, Cd, Depaoli, D, Di Girolamo, T, Di Pierro, F, Di Venere, L, Neira, Ede, Prester, Dd, Donini, A, Doro, M, Ramazani, Vf, Fattorini, A, Ferrara, G, Foffano, L, Fonseca, Mv, Font, L, Fruck, C, Fukami, S, Lopez, Rjg, Garczarczyk, M, Gasparyan, S, Gaug, M, Giglietto, N, Giordano, F, Gliwny, P, Green, Jg, Green, D, Hadasch, D, Hahn, A, Heckmann, L, Herrera, J, Hoang, J, Hrupec, D, Hutten, M, Inada, T, Inoue, S, Ishio, K, Iwamura, Y, Jormanainen, J, Jouvin, L, Kajiwara, Y, Karjalainen, M, Kerszberg, D, Kobayashi, Y, Kubo, H, Kushida, J, Lamastra, A, Lelas, D, Leone, F, Lindfors, E, Lombardi, S, Longo, F, Lopez, M, Lopez-Coto, R, Lopez-Oramas, A, Loporchio, S, Fraga, Bmd, Maggio, C, Majumdar, P, Makariev, M, Mallamaci, M, Maneva, G, Manganaro, M, Maraschi, L, Mariotti, M, Martinez, M, Mazin, D, Mender, S, Micanovic, S, Miceli, D, Miener, T, Minev, M, Miranda, Jm, Mirzoyan, R, Molina, E, Moralejo, A, Morcuende, D, Moreno, V, Moretti, E, Munar-Adrover, P, Neustroev, V, Nigro, C, Nilsson, K, Ninci, D, Nishijima, K, Noda, K, Nozaki, S, Ohtani, Y, Oka, T, Otero-Santos, J, Palatiello, M, Paneque, D, Paoletti, R, Paredes, Jm, Pavletic, L, Penil, P, Perennes, C, Persic, M, Moroni, Pgp, Prandini, E, Priyadarshi, C, Puljak, I, Rhode, W, Ribo, M, Rico, J, Righi, C, Rugliancich, A, Saha, L, Sahakyan, N, Saito, T, Sakurai, S, Satalecka, K, Schleicher, B, Schmidt, K, Schweizer, T, Sitarek, J, Snidaric, I, Sobczynska, D, Spolon, A, Stamerra, A, Strom, D, Strzys, M, Suda, Y, Suric, T, Takahashi, M, Tavecchio, F, Temnikov, P, Terzic, T, Teshima, M, Torres-Alba, N, Tosti, L, Truzzi, S, van Scherpenberg, J, Vanzo, G, Acosta, Mv, Ventura, S, Verguilov, V, Vigorito, Cf, Vitale, V, Vovk, I, Will, M, Zaric, D, Arbet-Engels, A, Baack, D, Balbo, M, Beck, M, Biederbeck, N, Biland, A, Bretz, T, Bruegge, K, Buss, J, Dorner, D, Elsaesser, D, Hildebrand, D, Iotov, R, Klinger, M, Mannheim, K, Neise, D, Neronov, A, Noethe, M, Paravac, A, Sliusar, V, Theissen, F, Walter, R, Valverde, J, Horan, D, Giroletti, M, Perri, M, Verrecchia, F, Leto, C, Sadun, Ac, Moody, Jw, Joner, M, Marscher, Ap, Jorstad, Sg, Lahteenmaki, A, Tornikoski, M, Ramakrishnan, V, Jarvela, E, Vera, Rjc, Righini, S, and Lien, Ay

Subjects
BL Lacertae objects: individual: Mrk 421, galaxies: active, methods: data analysis, methods: observational, radiation mechanisms: non-thermal, Non-thermal, Astrophysics, 4/3, GeV, 01 natural sciences, law.invention, Correlation, law, optical, MAGIC (telescope), data analysis [Methods], 010303 astronomy & astrophysics, Physics, individual: Mrk 421 [BL Lacertae objects], radio wave, Gamma ray, Low activity, X-ray, non-thermal [radiation mechanisms], Synchrotron, Log-normal distribution, Electrónica, Electricidad, Astrophysics - High Energy Astrophysical Phenomena, Radio wave, active [Galaxies], Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Cosmology and Extragalactic Astrophysics, VHE, GLAST, blazar, Flux (metallurgy), 0103 physical sciences, synchrotron, Radiation mechanisms, TeV, observational [Methods], Blazar, 010308 nuclear & particles physics, Astronomy and Astrophysics, Spectral component, MAGIC, flux, Space and Planetary Science, 13. Climate action, gamma ray, correlation, data analysi [methods], ddc:520, spectral, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Energy (signal processing)
Abstract

Acciari, V. A., et al. (MAGIC Collaboration), We report a characterization of the multiband flux variability and correlations of the nearby (z = 0.031) blazar Markarian 421 (Mrk 421) using data from Metsähovi, Swift, Fermi-LAT, MAGIC, FACT, and other collaborations and instruments from 2014 November till 2016 June. Mrk 421 did not show any prominent flaring activity, but exhibited periods of historically low activity above 1 TeV (F>1 TeV < 1.7 × 10-12 ph cm-2 s-1) and in the 2-10 keV (X-ray) band (F 2-10, keV< 3.6× 10-11 erg cm-2 s-1), during which the Swift-BAT data suggest an additional spectral component beyond the regular synchrotron emission. The highest flux variability occurs in X-rays and very high-energy (E > 0.1 TeV) γ-rays, which, despite the low activity, show a significant positive correlation with no time lag. The HRkeV and HRTeV show the harder-when-brighter trend observed in many blazars, but the trend flattens at the highest fluxes, which suggests a change in the processes dominating the blazar variability. Enlarging our data set with data from years 2007 to 2014, we measured a positive correlation between the optical and the GeV emission over a range of about 60 d centred at time lag zero, and a positive correlation between the optical/GeV and the radio emission over a range of about 60 d centred at a time lag of 43+9-6 d. This observation is consistent with the radio-bright zone being located about 0.2 parsec downstream from the optical/GeV emission regions of the jet. The flux distributions are better described with a lognormal function in most of the energy bands probed, indicating that the variability in Mrk 421 is likely produced by a multiplicative process., The financial support of the German BMBF and MPG; the Italian INFN and INAF; the Swiss National Fund SNF; the ERDF under the Spanish MINECO (FPA2017-87859-P, FPA2017-85668-P, FPA2017-82729-C6-2-R, FPA2017-82729-C6-6-R, FPA2017-82729-C6-5-R, AYA2015-71042-P, AYA2016-76012-C3-1-P, ESP2017-87055-C2-2-P, FPA2017-90566-REDC); the Indian Department of Atomic Energy; the Japanese ICRR, the University of Tokyo, JSPS, and MEXT; the Bulgarian Ministry of Education and Science, National RI Roadmap Project DO1-268/16.12.2019 and the Academy of Finland grant nr. 320045 is gratefully acknowledged. This work was also supported by the Spanish Centro de Excelencia ‘Severo Ochoa’ SEV-2016-0588 and SEV-2015-0548, the Unidad de Excelencia ‘María de Maeztu’ MDM-2014-0369 and the ‘la Caixa’ Foundation (fellowship LCF/BQ/PI18/11630012), by the Croatian Science Foundation (HrZZ) Project IP-2016-06-9782 and the University of Rijeka Project 13.12.1.3.02, by the DFG Collaborative Research Centers SFB823/C4 and SFB876/C3, the Polish National Research Centre grant UMO-2016/22/M/ST9/00382 and by the Brazilian MCTIC, CNPq, and FAPERJ.

Published
2021

5. Search for Gamma-Ray Spectral Lines from Dark Matter Annihilation up to 100 TeV toward the Galactic Center with MAGIC.

Author

Abe H, Abe S, Acciari VA, Aniello T, Ansoldi S, Antonelli LA, Arbet Engels A, Arcaro C, Artero M, Asano K, Baack D, Babić A, Baquero A, Barres de Almeida U, Barrio JA, Batković I, Baxter J, Becerra González J, Bednarek W, Bernardini E, Bernardos M, Berti A, Besenrieder J, Bhattacharyya W, Bigongiari C, Biland A, Blanch O, Bonnoli G, Bošnjak Ž, Burelli I, Busetto G, Carosi R, Carretero-Castrillo M, Ceribella G, Chai Y, Chilingarian A, Cikota S, Colombo E, Contreras JL, Cortina J, Covino S, D'Amico G, D'Elia V, Da Vela P, Dazzi F, De Angelis A, De Lotto B, Del Popolo A, Delfino M, Delgado J, Delgado Mendez C, Depaoli D, Di Pierro F, Di Venere L, Do Souto Espiñeira E, Dominis Prester D, Donini A, Dorner D, Doro M, Elsaesser D, Emery G, Fallah Ramazani V, Fariña L, Fattorini A, Font L, Fruck C, Fukami S, Fukazawa Y, García López RJ, Garczarczyk M, Gasparyan S, Gaug M, Giesbrecht Paiva JG, Giglietto N, Giordano F, Gliwny P, Godinović N, Green JG, Green D, Hadasch D, Hahn A, Hassan T, Heckmann L, Herrera J, Hrupec D, Hütten M, Imazawa R, Inada T, Iotov R, Ishio K, Jiménez Martínez I, Jormanainen J, Kerszberg D, Kobayashi Y, Kubo H, Kushida J, Lamastra A, Lelas D, Leone F, Lindfors E, Linhoff L, Lombardi S, Longo F, López-Coto R, López-Moya M, López-Oramas A, Loporchio S, Lorini A, Lyard E, Machado de Oliveira Fraga B, Majumdar P, Makariev M, Maneva G, Mang N, Manganaro M, Mangano S, Mannheim K, Mariotti M, Martínez M, Mas Aguilar A, Mazin D, Menchiari S, Mender S, Mićanović S, Miceli D, Miener T, Miranda JM, Mirzoyan R, Molina E, Mondal HA, Moralejo A, Morcuende D, Moreno V, Nakamori T, Nanci C, Nava L, Neustroev V, Nievas Rosillo M, Nigro C, Nilsson K, Nishijima K, Njoh Ekoume T, Noda K, Nozaki S, Ohtani Y, Oka T, Otero-Santos J, Paiano S, Palatiello M, Paneque D, Paoletti R, Paredes JM, Pavletić L, Persic M, Pihet M, Podobnik F, Prada Moroni PG, Prandini E, Principe G, Priyadarshi C, Puljak I, Rhode W, Ribó M, Rico J, Righi C, Rugliancich A, Sahakyan N, Saito T, Sakurai S, Satalecka K, Saturni FG, Schleicher B, Schmidt K, Schmuckermaier F, Schubert JL, Schweizer T, Sitarek J, Sliusar V, Sobczynska D, Spolon A, Stamerra A, Strišković J, Strom D, Strzys M, Suda Y, Surić T, Takahashi M, Takeishi R, Tavecchio F, Temnikov P, Terauchi K, Terzić T, Teshima M, Tosti L, Truzzi S, Tutone A, Ubach S, van Scherpenberg J, Vazquez Acosta M, Ventura S, Verguilov V, Viale I, Vigorito CF, Vitale V, Vovk I, Walter R, Will M, Wunderlich C, Yamamoto T, Zarić D, Hiroshima N, and Kohri K

Abstract

Linelike features in TeV γ rays constitute a "smoking gun" for TeV-scale particle dark matter and new physics. Probing the Galactic Center region with ground-based Cherenkov telescopes enables the search for TeV spectral features in immediate association with a dense dark matter reservoir at a sensitivity out of reach for satellite γ-ray detectors, and direct detection and collider experiments. We report on 223 hours of observations of the Galactic Center region with the MAGIC stereoscopic telescope system reaching γ-ray energies up to 100 TeV. We improved the sensitivity to spectral lines at high energies using large-zenith-angle observations and a novel background modeling method within a maximum-likelihood analysis in the energy domain. No linelike spectral feature is found in our analysis. Therefore, we constrain the cross section for dark matter annihilation into two photons to ⟨σv⟩≲5×10^{-28}  cm^{3} s^{-1} at 1 TeV and ⟨σv⟩≲1×10^{-25}  cm^{3} s^{-1} at 100 TeV, achieving the best limits to date for a dark matter mass above 20 TeV and a cuspy dark matter profile at the Galactic Center. Finally, we use the derived limits for both cuspy and cored dark matter profiles to constrain supersymmetric wino models.

Published
2023
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6. Characterization of Thermoluminescent Dosimeters for Neutron Dosimetry at High Altitudes.

Author

D'Avino V, Ambrosino F, Bedogni R, Campoy AIC, La Verde G, Vernetto S, Vigorito CF, and Pugliese M

Subjects
Altitude, Humans, Neutrons, Radiation Dosage, Thermoluminescent Dosimetry, Americium, Radiation Dosimeters
Abstract

Neutrons constitute a significant component of the secondary cosmic rays and are one of the most important contributors to natural cosmic ray radiation background dose. The study of the cosmic ray neutrons' contribution to the dose equivalent received by humans is an interesting and challenging task for the scientific community. In addition, international regulations demand assessing the biological risk due to radiation exposure for both workers and the general population. Because the dose rate due to cosmic radiation increases significantly with altitude, the objective of this work was to characterize the thermoluminescent dosimeter (TLDs) from the perspective of exposing them at high altitudes for longtime neutron dose monitoring. The pair of TLD-700 and TLD-600 is amply used to obtain the information on gamma and neutron dose in mixed neutron-gamma fields due to the present difference in 6Li isotope concentration. A thermoluminescence dosimeter system based on pair of TLD-600/700 was characterized to enable it for neutron dosimetry in the thermal energy range. The system was calibrated in terms of neutron ambient dose equivalent in an experimental setup using a 241Am-B radionuclide neutron source coated by a moderator material, polyethylene, creating a thermalized neutron field. Afterward, the pair of TLD-600/700 was exposed at the CERN-EU High-Energy Reference Field (CERF) facility in Geneva, which delivers a neutron field with a spectrum similar to that of secondary cosmic rays. The dosimetric system provided a dose value comparable with the calculated one demonstrating a good performance for neutron dosimetry.

Published
2022
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7. Bounds on Lorentz Invariance Violation from MAGIC Observation of GRB 190114C.

Author

Acciari VA, Ansoldi S, Antonelli LA, Arbet Engels A, Baack D, Babić A, Banerjee B, Barres de Almeida U, Barrio JA, Becerra González J, Bednarek W, Bellizzi L, Bernardini E, Berti A, Besenrieder J, Bhattacharyya W, Bigongiari C, Biland A, Blanch O, Bonnoli G, Bošnjak Ž, Busetto G, Carosi R, Ceribella G, Cerruti M, Chai Y, Chilingarian A, Cikota S, Colak SM, Colin U, Colombo E, Contreras JL, Cortina J, Covino S, D'Amico G, D'Elia V, Da Vela P, Dazzi F, De Angelis A, De Lotto B, Delfino M, Delgado J, Depaoli D, Di Pierro F, Di Venere L, Do Souto Espiñeira E, Dominis Prester D, Donini A, Dorner D, Doro M, Elsaesser D, Fallah Ramazani V, Fattorini A, Ferrara G, Foffano L, Fonseca MV, Font L, Fruck C, Fukami S, García López RJ, Garczarczyk M, Gasparyan S, Gaug M, Giglietto N, Giordano F, Gliwny P, Godinović N, Green D, Hadasch D, Hahn A, Herrera J, Hoang J, Hrupec D, Hütten M, Inada T, Inoue S, Ishio K, Iwamura Y, Jouvin L, Kajiwara Y, Karjalainen M, Kerszberg D, Kobayashi Y, Kubo H, Kushida J, Lamastra A, Lelas D, Leone F, Lindfors E, Lombardi S, Longo F, López M, López-Coto R, López-Oramas A, Loporchio S, Machado de Oliveira Fraga B, Maggio C, Majumdar P, Makariev M, Mallamaci M, Maneva G, Manganaro M, Mannheim K, Maraschi L, Mariotti M, Martínez M, Mazin D, Mender S, Mićanović S, Miceli D, Miener T, Minev M, Miranda JM, Mirzoyan R, Molina E, Moralejo A, Morcuende D, Moreno V, Moretti E, Munar-Adrover P, Neustroev V, Nigro C, Nilsson K, Ninci D, Nishijima K, Noda K, Nogués L, Nozaki S, Ohtani Y, Oka T, Otero-Santos J, Palatiello M, Paneque D, Paoletti R, Paredes JM, Pavletić L, Peñil P, Perennes C, Peresano M, Persic M, Prada Moroni PG, Prandini E, Puljak I, Rhode W, Ribó M, Rico J, Righi C, Rugliancich A, Saha L, Sahakyan N, Saito T, Sakurai S, Satalecka K, Schleicher B, Schmidt K, Schweizer T, Sitarek J, Šnidarić I, Sobczynska D, Spolon A, Stamerra A, Strom D, Strzys M, Suda Y, Surić T, Takahashi M, Tavecchio F, Temnikov P, Terzić T, Teshima M, Torres-Albà N, Tosti L, van Scherpenberg J, Vanzo G, Vazquez Acosta M, Ventura S, Verguilov V, Vigorito CF, Vitale V, Vovk I, Will M, Zarić D, and Nava L

Abstract

On January 14, 2019, the Major Atmospheric Gamma Imaging Cherenkov telescopes detected GRB 190114C above 0.2 TeV, recording the most energetic photons ever observed from a gamma-ray burst. We use this unique observation to probe an energy dependence of the speed of light in vacuo for photons as predicted by several quantum gravity models. Based on a set of assumptions on the possible intrinsic spectral and temporal evolution, we obtain competitive lower limits on the quadratic leading order of speed of light modification.

Published
2020
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