利用 H.E.S.S. 对 M 87 的观测限制室女座星系团内部的宇宙线压力
摘要
M87 发出伽马射线辐射的起源目前仍是一个有争议的问题。本工作旨在对 M87 的 VHE（100 GeV-100 TeV）伽马射线辐射进行定位，并探测室女座星系团内部潜在的延展强子辐射成分。寻找 M87 周围稳定且延展的伽马射线信号可以限制宇宙线能量密度以及宇宙线对星系团内介质施加的压力，并允许我们研究宇宙线在室女座星系团中作为加热机制在活动星系核反馈中的作用。H.E.S.S. 望远镜对 VHE 伽马射线敏感，自 2004 年以来一直被用于观测 M87。我们利用贝叶斯块分析对 2004 年至 2021 年的 H.E.S.S. 观测数据进行了 M87 辐射状态的识别，将其划分为低态、中间态和高态。基于因果性论证，延展（kpc）信号仅在稳定辐射状态下是允许的。因此，我们拟合了 120 小时低态数据的形态，未发现显著的伽马射线延展。因此，对于低态，我们在 99.7% 置信水平下，推导出由旋转对称 2D 高斯模型描述的单成分形态模型的延展上限为 58"（对应于 4.6kpc）。我们的结果排除了射电瓣（30 kpc）作为 M87 低态 VHE 伽马射线辐射的主要成分。伽马射线辐射与 M87 射电核心处的单一辐射区域相容。这些结果借助两种多成分模型，限制了最大宇宙线与热压力比 ，以及在假设 CRp 在动量上服从谱指数 =2.1 的幂律分布时，室女座星系团内部 20kpc 范围内宇宙线质子 (CRp) 的总能量 5 erg。
引用
@article{arxiv.2305.09607,
title = {Constraining the cosmic-ray pressure in the inner Virgo Cluster using H.E.S.S. observations of M 87},
author = {H. E. S. S. Collaboration and : and F. Aharonian and F. Ait Benkhali and C. Arcaro and J. Aschersleben and M. Backes and V. Barbosa Martins and R. Batzofin and Y. Becherini and D. Berge and K. Bernlöhr and B. Bi and M. Böttcher and C. Boisson and J. Bolmont and J. Borowska and F. Bradascio and M. Breuhaus and R. Brose and F. Brun and B. Bruno and T. Bulik and C. Burger-Scheidlin and T. Bylund and S. Caroff and S. Casanova and R. Cecil and J. Celic and M. Cerruti and T. Chand and S. Chandra and A. Chen and J. Chibueze and O. Chibueze and G. Cotter and J. Damascene Mbarubucyeye and A. Djannati-Ataï and K. Egberts and J. -P. Ernenwein and G. Fichet de Clairfontaine and M. Filipovic and G. Fontaine and M. Füßling and S. Funk and S. Gabici and S. Ghafourizadeh and G. Giavitto and D. Glawion and J. F. Glicenstein and P. Goswami and G. Grolleron and M. -H. Grondin and L. Haerer and M. Haupt and G. Hermann and J. A. Hinton and T. L. Holch and D. Horns and M. Jamrozy and F. Jankowsky and V. Joshi and I. Jung-Richardt and E. Kasai and K. Katarzyński and R. Khatoon and B. Khélifi and W. Kluźniak and Nu. Komin and K. Kosack and D. Kostunin and R. G. Lang and S. Le Stum and F. Leitl and A. Lemière and M. Lemoine-Goumard and J. -P. Lenain and F. Leuschner and T. Lohse and A. Luashvili and I. Lypova and J. Mackey and D. Malyshev and D. Malyshev and V. Marandon and P. Marchegiani and A. Marcowith and P. Marinos and G. Martí-Devesa and R. Marx and M. Meyer and A. Mitchell and R. Moderski and L. Mohrmann and A. Montanari and E. Moulin and J. Muller and K. Nakashima and M. de Naurois and J. Niemiec and A. Priyana Noel and P. O'Brien and S. Ohm and L. Olivera-Nieto and E. de Ona Wilhelmi and S. Panny and M. Panter and R. D. Parsons and G. Peron and S. Pita and D. A. Prokhorov and H. Prokoph and G. Pühlhofer and A. Quirrenbach and P. Reichherzer and A. Reimer and O. Reimer and M. Renaud and F. Rieger and G. Rowell and B. Rudak and E. Ruiz Velasco and V. Sahakian and H. Salzmann and D. A. Sanchez and A. Santangelo and M. Sasaki and J. Schäfer and F. Schüssler and U. Schwanke and J. N. S. Shapopi and H. Sol and A. Specovius and S. Spencer and Ł. Stawarz and R. Steenkamp and S. Steinmassl and C. Steppa and I. Sushch and H. Suzuki and T. Takahashi and T. Tanaka and A. M. Taylor and R. Terrier and M. Tsirou and N. Tsuji and Y. Uchiyama and C. van Eldik and B. van Soelen and M. Vecchi and J. Veh and C. Venter and J. Vink and T. Wach and S. J. Wagner and R. White and A. Wierzcholska and Yu Wun Wong and M. Zacharias and D. Zargaryan and A. A. Zdziarski and A. Zech and S. Zouari and N. Żywucka},
journal= {arXiv preprint arXiv:2305.09607},
year = {2023}
}
备注
15 pages, 7 figures. Accepted for publication in A&A. Corresponding authors: Victor Barbosa Martins, Stefan Ohm, Cornelia Arcaro, Natalia \.Zywucka, Mathieu de Naurois