LMC N132D: A mature supernova remnant with a power-law gamma-ray spectrum extending beyond 8 TeV
In: Astron.Astrophys. Astron.Astrophys., 2021, 655, pp.A7. ⟨10.1051/0004-6361/202141486⟩ Astronomy and astrophysics 655, A7 (2021). doi:10.1051/0004-6361/202141486 Astronomy & Astrophysics, 655:A7. EDP Sciences; (2021)
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Astronomy and astrophysics 655, A7 (2021). doi:10.1051/0004-6361/202141486
Context. Supernova remnants (SNRs) are commonly thought to be the dominant sources of Galactic cosmic rays up to the knee of the cosmic-ray spectrum at a few PeV. Imaging Atmospheric Cherenkov Telescopes have revealed young SNRs as very-high-energy (VHE, >100 GeV) gamma-ray sources, but for only a few SNRs the hadronic cosmic-ray origin of their gamma-ray emission is indisputably established. In all these cases, the gamma-ray spectra exhibit a spectral cutoff at energies much below 100 TeV and thus do not reach the PeVatron regime.Aims. The aim of this work was to achieve a firm detection for the oxygen-rich SNR LMC N132D in the VHE gamma-ray domain with an extended set of data, and to clarify the spectral characteristics and the localization of the gamma-ray emission from this exceptionally powerful gamma-ray-emitting SNR.Methods. We analyzed 252 h of High Energy Stereoscopic System (H.E.S.S.) observations towards SNR N132D that were accumulated between December 2004 and March 2016 during a deep survey of the Large Magellanic Cloud, adding 104 h of observations to the previously published data set to ensure a > 5σ detection. To broaden the gamma-ray spectral coverage required for modeling the spectral energy distribution, an analysis of Fermi-LAT Pass 8 data was also included.Results. We unambiguously detect N132D at VHE with a significance of 5.7σ. We report the results of a detailed analysis of its spectrum and localization based on the extended H.E.S.S. data set. The joint analysis of the extended H.E.S.S and Fermi-LAT data results in a spectral energy distribution in the energy range from 1.7 GeV to 14.8 TeV, which suggests a high luminosity of N132D at GeV and TeV energies. We set a lower limit on a gamma-ray cutoff energy of 8 TeV with a confidence level of 95%. The new gamma-ray spectrum as well as multiwavelength observations of N132D when compared to physical models suggests a hadronic origin of the VHE gamma-ray emission.Conclusions. SNR N132D is a VHE gamma-ray source that shows a spectrum extending to the VHE domain without a spectral cutoff at a few TeV, unlike the younger oxygen-rich SNR Cassiopeia A. The gamma-ray emission is best explained by a dominant hadronic component formed by diffusive shock acceleration. The gamma-ray properties of N132D may be affected by an interaction with a nearby molecular cloud that partially lies inside the 95% confidence region of the source position.Key words: gamma rays: general / cosmic rays / ISM: supernova remnants
Published by EDP Sciences, Les Ulis
| Titel: |
LMC N132D: A mature supernova remnant with a power-law gamma-ray spectrum extending beyond 8 TeV
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| Autor/in / Beteiligte Person: | Abdalla, H. ; Aharonian, F. ; Martins, V. Barbosa ; Klepser, S. ; Kluźniak, W. ; Komin, Nu. ; Konno, R. ; Kosack, K. ; Kostunin, D. ; Kreter, M. ; Mezek, G. Kukec ; Kundu, A. ; Lamanna, G. ; Barnacka, A. ; Stum, S. Le ; Lemière, A. ; Lemoine-Goumard, M. ; Lenain, J. P. ; Leuschner, F. ; Levy, C. ; Lohse, T. ; Luashvili, A. ; Lypova, I. ; Mackey, J. ; Barnard, M. ; Majumdar, J. ; Malyshev, D. ; Marandon, V. ; Marchegiani, P. ; Marcowith, A. ; Mares, A. ; Martí-Devesa, G. ; Marx, R. ; Maurin, G. ; Meintjes, P. J. ; Batzofin, R. ; Meyer, M. ; Mitchell, A. ; Moderski, R. ; Mohrmann, L. ; Montanari, A. ; Moore, C. ; Morris, P. ; Moulin, E. ; Muller, J. ; Murach, T. ; Becherini, Y. ; Nakashima, K. ; de Naurois, M. ; Nayerhoda, A. ; Ndiyavala, H. ; Niemiec, J. ; Oakes, L. ; Peyaud, B. ; Piel, Q. ; Noel, A. Priyana ; O'Brien, P. ; Berge, D. ; Oberholzer, L. ; Odaka, H. ; Ohm, S. ; Olivera-Nieto, L. ; Wilhelmi, E. de Ona ; Ostrowski, M. ; Panny, S. ; Panter, M. ; Parsons, R. D. ; Peron, G. ; Bernlöhr, K. ; Pita, S. ; Poireau, V. ; Prokhorov, D. A. ; Prokoph, H. ; Pühlhofer, G. ; Punch, M. ; Quirrenbach, A. ; Raab, S. ; Rauth, R. ; Reichherzer, P. ; Bi, B. ; Reimer, A. ; Reimer, O. ; Remy, Q. ; Renaud, M. ; Rinchiuso, L. ; Reville, B. ; Rieger, F. ; Romoli, C. ; Rowell, G. ; Rudak, B. ; Böttcher, M. ; Ricarte, H. Rueda ; Ruiz-Velasco, E. ; Sahakian, V. ; Sailer, S. ; Salzmann, H. ; Sanchez, D. A. ; Santangelo, A. ; Sasaki, M. ; Scalici, M. ; Schäfer, J. ; Boisson, C. ; Schüssler, F. ; Schutte, H. M. ; Schwanke, U. ; Seglar-Arroyo, M. ; Senniappan, M. ; Seyffert, A. S. ; Shafi, N. ; Shapopi, J. N. S. ; Shiningayamwe, K. ; Simoni, R. ; Benkhali, F. Ait ; Bolmont, J. ; Sinha, A. ; Sol, H. ; Specovius, A. ; Spencer, S. ; Spir-Jacob, M. ; Stawarz, L. ; Steenkamp, R. ; Stegmann, C. ; Steinmassl, S. ; Steppa, C. ; de Lavergne, M. de Bony ; Sun, L. ; Takahashi, T. ; Tanaka, T. ; Tavernier, T. ; Taylor, A. M. ; Terrier, R. ; Thiersen, J. H. E. ; Thorpe-Morgan, C. ; Tiziani, D. ; Tluczykont, M. ; Breuhaus, M. ; Tomankova, L. ; Trichard, C. ; Tsirou, M. ; Tsuji, N. ; Tuffs, R. ; Uchiyama, Y. ; van der Walt, D. J. ; van Eldik, C. ; van Rensburg, C. ; van Soelen, B. ; Brose, R. ; Vasileiadis, G. ; Veh, J. ; Venter, C. ; Vincent, P. ; Vink, J. ; Völk, H. J. ; Wadiasingh, Z. ; Wagner, S. J. ; Watson, J. ; Werner, F. ; Brun, F. ; White, R. ; Wierzcholska, A. ; Wong, Yu Wun ; Yassin, H. ; Yusafzai, A. ; Zacharias, M. ; Zanin, R. ; Zargaryan, D. ; Zdziarski, A. A. ; Zech, A. ; Brun, P. ; Zhu, S. J. ; Zmija, A. ; Zorn, J. ; Zouari, S. ; Żywucka, N. ; Collaboration, H. E. S. S. ; Bryan, M. ; Büchele, M. ; Bulik, T. ; Bylund, T. ; Angüner, E. O. ; Cangemi, F. ; Caroff, S. ; Carosi, A. ; Casanova, S. ; Catalano, J. ; Chambery, P. ; Chand, T. ; Chandra, S. ; Chen, A. ; Cotter, G. ; Arcaro, C. ; Curyło, M. ; Mbarubucyeye, J. Damascene ; Davids, I. D. ; Davies, J. ; Deil, C. ; Devin, J. ; Dirson, L. ; Djannati-Atai, A. ; Dmytriiev, A. ; Donath, A. ; Armand, C. ; Doroshenko, V. ; Dreyer, L. ; Plessis, L. Du ; Duffy, C. ; Dyks, J. ; Egberts, K. ; Eichhorn, F. ; Einecke, S. ; Emery, G. ; Ernenwein, J. P. ; Armstrong, T. ; Fegan, S. ; Feijen, K. ; Fiasson, A. ; de Clairfontaine, G. Fichet ; Fontaine, G. ; Lott, F. ; Füßling, M. ; Funk, S. ; Gabici, S. ; Gallant, Y. A. ; Ashkar, H. ; Giavitto, G. ; Giunti, L. ; Glawion, D. ; Glicenstein, J. F. ; Grondin, M. H. ; Hattingh, S. ; Hahn, J. ; Haupt, M. ; Hermann, G. ; Hinton, J. A. ; Backes, M. ; Hofmann, W. ; Hoischen, C. ; Holch, T. L. ; Holler, M. ; Hörbe, M. ; Horns, D. ; Huang, Zhiqiu ; Huber, D. ; Jamrozy, M. ; Jankowsky, D. ; Baghmanyan, V. ; Jankowsky, F. ; Jardin-Blicq, A. ; Joshi, V. ; Jung-Richardt, I. ; Kasai, E. ; Kastendieck, M. A. ; Katarzynski, K. ; Katz, U. ; Khangulyan, D. ; Khélifi, B. ; Centre de Physique des Particules de Marseille (CPPM) ; Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS) ; Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE (UMR_7585)) ; Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) ; Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG) ; Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS) ; AstroParticule et Cosmologie (APC (UMR_7164)) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris ; Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) ; Laboratoire Univers et Particules de Montpellier (LUPM) ; Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS) ; H.E.S.S. ; Collaboration, H.E.S.S. ; High Energy Astrophys. & Astropart. Phys (API, FNWI) |
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| Quelle: | Astron.Astrophys. Astron.Astrophys., 2021, 655, pp.A7. ⟨10.1051/0004-6361/202141486⟩ Astronomy and astrophysics 655, A7 (2021). doi:10.1051/0004-6361/202141486 Astronomy & Astrophysics, 655:A7. EDP Sciences; (2021) |
| Veröffentlichung: | HAL CCSD, 2021 |
| Medientyp: | unknown |
| ISSN: | 0004-6361 (print) |
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