
Detection of the Geminga pulsar with MAGIC hints at a power-law tail emission beyond 15 GeV
2020; EDP Sciences; Volume: 643; Linguagem: Inglês
10.1051/0004-6361/202039131
ISSN1432-0746
AutoresV. A. Acciari, Stefano Ansoldi, L. A. Antonelli, A. Arbet Engels, Katsuaki Asano, Dominik Baack, A. Babić, Andrés Baquero, U. Barres de Almeida, J. A. Barrio, J. Becerra González, W. Bednarek, Lorenzo Bellizzi, E. Bernardini, M. Bernardos, A. Berti, Jürgen Besenrieder, W. Bhattacharyya, C. Bigongiari, A. Biland, O. Blanch, G. Bonnoli, Ž. Bošnjak, G. Busetto, R. Carosi, Giovanni Ceribella, M. Cerruti, Yating Chai, A. Chilingarian, S. Cikota, S. M. Colak, E. Colombo, J. L. Contreras, J. Cortina, S. Covino, Giacomo D’Amico, V. D’Elia, P. Da Vela, F. Dazzi, A. De Angelis, B. De Lotto, M. Delfino, J. Delgado, C. Delgado Mendez, Davide Depaoli, T. Di Girolamo, F. Di Pierro, L. Di Venere, E. Do Souto Espiñeira, D. Dominis Prester, Alice Donini, D. Dorner, M. Doro, D. Elsäesser, V. Fallah Ramazani, Alicia Fattorini, G. Ferrara, Luca Foffano, M. V. Fonseca, L. Font, C. Fruck, Satoshi Fukami, R. J. Garcı́a López, M. Garczarczyk, S. Gasparyan, M. Gaug, N. Giglietto, F. Giordano, Paweł Gliwny, N. Godinović, Jarred Gershon Green, D. Green, D. Hadasch, A. Hahn, Lea Heckmann, Juan Manuel Herrera, John Hoang, Dario Hrupec, Moritz Hütten, Tomohiro Inada, Susumu Inoue, Kazuma Ishio, Y. Iwamura, Jenni Jormanainen, L. Jouvin, Y. Kajiwara, Marie Karjalainen, D. Kerszberg, Yukiho Kobayashi, H. Kubo, J. Kushida, A. Lamastra, A. La Barbera, F. Leone, E. Lindfors, S. Lombardi, F. Longo, R. López-Coto, Marcos López, A. López-Oramas, S. Loporchio, B. Machado de Oliveira Fraga, C. Maggio, P. Majumdar, M. Makariev, M. Mallamaci, G. Maneva, M. Manganaro, K. Mannheim, L. Maraschi, M. Mariotti, M. Martı́nez, D. Mazin, S. Mender, S. Mičanović, Davide Miceli, Tjark Miener, M. Minev, J. M. Miranda, R. Mirzoyan, E. Molina, A. Moralejo, Daniel Morcuende, V. Moreno, E. Moretti, P. Munar-Adrover, V. Neustroev, Cosimo Nigro, K. Nilsson, D. Ninci, K. Nishijima, K. Noda, S. Nozaki, Y. Ohtani, Tomohiko Oka, Jorge Otero-Santos, M. Palatiello, D. Paneque, R. Paoletti, J. M. Paredes, L. Pavletić, Pablo Peñil, C. Perennes, M. Persic, P. G. Prada Moroni, E. Prandini, Chaitanya Priyadarshi, I. Puljak, W. Rhode, M. Ribó, J. Rico, Chiara Righi, A. Rugliancich, L. Saha, N. Sahakyan, T. Saito, S. Sakurai, K. Satalecka, Francesco Gabriele Saturni, Bernd Schleicher, K. Schmidt, T. Schweizer, J. Sitarek, I. Šnidarić, D. Sobczyńska, Alessia Spolon, A. Stamerra, D. Strom, M. Strzys, Y. Suda, T. Surić, Mitsunari Takahashi, F. Tavecchio, P. Temnikov, T. Terzić, M. Teshima, N. Torres-Albà, Luca Tosti, Stefano Truzzi, Antonio Tutone, Juliane van Scherpenberg, G. Vanzo, M. Vázquez Acosta, Sofia Ventura, V. Verguilov, C. F. Vigorito, V. Vitale, Ievgen Vovk, Martin Will, Darko Zarić, Kouichi Hirotani, P. M. Saz Parkinson,
Tópico(s)Gamma-ray bursts and supernovae
ResumoWe report the detection of pulsed gamma-ray emission from the Geminga pulsar (PSR J0633+1746) between $15\,$GeV and $75\,$GeV. This is the first time a middle-aged pulsar has been detected up to these energies. Observations were carried out with the MAGIC telescopes between 2017 and 2019 using the low-energy threshold Sum-Trigger-II system. After quality selection cuts, $\sim 80\,$hours of observational data were used for this analysis. To compare with the emission at lower energies below the sensitivity range of MAGIC, $11$ years of Fermi-LAT data above $100\,$MeV were also analysed. From the two pulses per rotation seen by Fermi-LAT, only the second one, P2, is detected in the MAGIC energy range, with a significance of $6.3\,\sigma$. The spectrum measured by MAGIC is well-represented by a simple power law of spectral index $\Gamma= 5.62\pm0.54$, which smoothly extends the Fermi-LAT spectrum. A joint fit to MAGIC and Fermi-LAT data rules out the existence of a sub-exponential cut-off in the combined energy range at the $3.6\,\sigma$ significance level. The power-law tail emission detected by MAGIC is interpreted as the transition from curvature radiation to Inverse Compton Scattering of particles accelerated in the northern outer gap.
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