PoS - Proceedings of Science
Volume 395 - 37th International Cosmic Ray Conference (ICRC2021) - GAD - Gamma Ray Direct
Analysis of the W 44 Supernova Remnant and its surroundings with Fermi-LAT and MAGIC
Presented by R. Di Tria and L. Di Venere*  on behalf of F. Giordano, D. Green, A. Hahn, F. Romana Pantaleo, M.C. Strzys,  The MAGIC Collaboration,  The Fermi Large Area Telescope Collaboration, V.A. Acciari, S. Ansoldi, L.A. Antonelli, A. Arbet Engels, M. Artero, K. Asano, D. Baack, A. Babic, A. Baquero, U. Barres de Almeida, J.A. Barrio, I. Batković, J. Becerra Gonzalez, W. Bednarek, L. Bellizzi, E. Bernardini, M.I. Bernardos, A. Berti, J. Besenrieder, W. Bhattacharyya, C. Bigongiari, A. Biland, O. Blanch, H. Bökenkamp, G. Bonnoli, Z. Bosnjak, G. Busetto, R. Carosi, G. Ceribella, M. Cerruti, Y. Chai, A.A. Chilingarian, S. Cikota, S.M. Colak, E. Colombo, J.L. Contreras, J. Cortina, S. Covino, G. D'Amico, V. D'Elia, P. Da Vela, F. Dazzi, A. De Angelis, B. De Lotto, M. Delfino, J. Delgado, C. Delgado Mendez, D. Depaoli, F. Di Pierro, E. Do Souto Espiñeira, D. Dominis Prester, A. Donini, D. Dorner, M. Doro, D. Elsaesser, V. Fallah Ramazani, A. Fattorini, M.V. Fonseca, L. Font, C. Fruck, S. Fukami, Y. Fukazawa, R.J. García López, M. Garczarczyk, S. Gasparyan, M. Gaug, N. Giglietto, P. Gliwny, N. Godinovic, J.G. Green, D. Hadasch, L. Heckmann, J. Herrera, J. Hoang, D. Hrupec, M. Hütten, T. Inada, K. Ishio, Y. Iwamura, I. Jiménez Martínez, J. Jormanainen, L. Jouvin, M. Karjalainen, D. Kerszberg, Y. Kobayashi, H. Kubo, J. Kushida, A. Lamastra, D. Lelas, F. Leone, E. Lindfors, L. Linhoff, S. Lombardi, F. Longo, R. Lopez-Coto, M. López-Moya, 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. Martinez, D. Mazin, S. Menchiari, S. Mender, S. Mićanović, D. Miceli, T. Miener, J.M. Miranda, R. Mirzoyan, E. Molina, A. Moralejo, D. Morcuende, V. Moreno, E. Moretti, T. Nakamori, L. Nava, V. Neustroev, C. Nigro, K. Nilsson, K. Nishijima, K. Noda, S. Nozaki, Y. Ohtani, T. Oka, J. Otero-Santos, S. Paiano, M. Palatiello, D. Paneque, R. Paoletti, J.M. Paredes, L. Pavletić, P. Peñil, M. Persic, M. Pihet, P.G. Prada Moroni, E. Prandini, C. Priyadarshi, I. Puljak, W. Rhode, M. Ribó, J. Rico, C. Righi, A. Rugliancich, N. Sahakyan, T. Saito, S. Sakurai, K. Satalecka, F.G. Saturni, B. Schleicher, K. Schmidt, T. Schweizer, J. Sitarek, I. Šnidarić, D. Sobczyńska, A. Spolon, A. Stamerra, J. Strišković, D. Strom, Y. Suda, T. Surić, M. Takahashi, R. Takeishi, F. Tavecchio, P. Temnikov, T. Terzic, M. Teshima, L. Tosti, S. Truzzi, A. Tutone, S. Ubach, J. van Scherpenberg, G. Vanzo, M. Vazquez Acosta, S. Ventura, V. Verguilov, C.f. Vigorito, V. Vitale, I. Vovk, M. Will, C. Wunderlich, T. Yamamoto, D. Zarić  on behalf of the Fermi-LAT and MAGIC collaborationset al. (click to show)
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Pre-published on: July 28, 2021
Published on: March 18, 2022
Abstract
The well-known supernova remnant (SNR) W 44 is observed in high-energy gamma rays and widely studied to investigate cosmic ray (CR) acceleration. Several analyses of the W 44 surroundings
showed the presence of gamma-ray emission offset from the radio SNR shell. This emission is thought to originate from escaped high-energy CRs. We present a detailed analysis
of the W 44 region as seen by Fermi-LAT, focusing on the spatial and spectral characteristics of both W44 SNR and its surroundings. The spatial analysis was limited to energies above 1 GeV in order to exploit the improved angular resolution of the instrument, deriving a detailed description of the region morphology. Observations of the north-western region of W 44, also known as SRC-1 from previous works, were conducted with the MAGIC telescopes in the very high-energy gamma-ray band. We analysed MAGIC data exploiting the spatial information derived with the Fermi-LAT analysis at GeV energies. Here we show the results of both analyses and the combined Fermi-LAT and MAGIC spectra, thus obtaining constraining information on the diffusion of the escaped CRs.
DOI: https://doi.org/10.22323/1.395.0642
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