MAGIC 对银河系中心附近弥漫 γ 射线辐射的观测
高能天体物理现象
2020-10-21 v1
摘要
目的：γ射线可用作搜寻银河系宇宙线（CRs）源的示踪剂。我们展示了利用MAGIC望远镜对银河系中心（GC）区域的深度观测，并借此推断潜在的CR分布。方法：我们在2012年至2017年间以高天顶角（58-70度）用MAGIC望远镜观测GC区域约100小时。这意味着相比低天顶角观测有更高的能量阈值，但也增大了有效收集面积。利用新软件，我们推导了仪器响应和背景模型，使我们能够研究该区域的弥漫辐射。我们使用GC区域气体分布的已有数据来推导CR的潜在分布。结果：我们对用于拟合数据的全部四个模型分量（Sgr A*、"Arc"、G0.9+0.1以及银河系脊的扩展分量）均获得显著探测。我们发现弥漫分量最好用指数为2的幂律及约20 TeV处的指数截断来描述，截断的显著性仅为2σ。推导出的宇宙线分布轮廓暗示在GC位置存在峰值，测得轮廓指数为1.2±0.3，支持GC存在CR加速器的假说。我们认为该轮廓的测量目前受限于我们对GC附近气体分布的认识。
引用
@article{arxiv.2006.00623,
title = {MAGIC observations of the diffuse $\gamma$-ray emission in the vicinity of the Galactic Centre},
author = {MAGIC Collaboration and V. A. Acciari and S. Ansoldi and L. A. Antonelli and A. Arbet Engels and D. Baack and A. Babić and B. Banerjee and U. Barres de Almeida and J. A. Barrio and J. Becerra González and W. Bednarek and L. Bellizzi and E. Bernardini and A. Berti and J. Besenrieder and W. Bhattacharyya and C. Bigongiari and A. Biland and O. Blanch and G. Bonnoli and Ž. Bošnjak and G. Busetto and R. Carosi and G. Ceribella and Y. Chai and A. Chilingaryan and S. Cikota and S. M. Colak and U. Colin and E. Colombo and J. L. Contreras and J. Cortina and S. Covino and V. D'Elia and P. Da Vela and F. Dazzi and A. De Angelis and B. De Lotto and M. Delfino and J. Delgado and D. Depaoli and F. Di Pierro and L. Di Venere and E. Do Souto Espiñeira and D. Dominis Prester and A. Donini and D. Dorner and M. Doro and D. Elsaesser and V. Fallah Ramazani and A. Fattorini and A. Fernández-Barral and G. Ferrara and D. Fidalgo and L. Foffano and M. V. Fonseca and L. Font and C. Fruck and S. Fukami and R. J. García López and M. Garczarczyk and S. Gasparyan and M. Gaug and N. Giglietto and F. Giordano and N. Godinović and D. Green and D. Guberman and D. Hadasch and A. Hahn and J. Herrera and J. Hoang and D. Hrupec and M. Hütten and T. Inada and S. Inoue and K. Ishio and Y. Iwamura and L. Jouvin and D. Kerszberg and H. Kubo and J. Kushida and A. Lamastra and D. Lelas and F. Leone and E. Lindfors and S. Lombardi and F. Longo and M. López and R. López-Coto and A. López-Oramas and S. Loporchio and B. Machado de Oliveira Fraga and C. Maggio and P. Majumdar and M. Makariev and M. Mallamaci and G. Maneva and M. Manganaro and K. Mannheim and L. Maraschi and M. Mariotti and M. Martínez and S. Masuda and D. Mazin and S. Mićanović and D. Miceli and M. Minev and J. M. Miranda and R. Mirzoyan and E. Molina and A. Moralejo and D. Morcuende and V. Moreno and E. Moretti and P. Munar-Adrover and V. Neustroev and C. Nigro and K. Nilsson and D. Ninci and K. Nishijima and K. Noda and L. Nogués and M. Nöthe and S. Nozaki and S. Paiano and J. Palacio and M. Palatiello and D. Paneque and R. Paoletti and J. M. Paredes and P. Peñil and M. Peresano and M. Persic and P. G. Prada Moroni and E. Prandini and I. Puljak and W. Rhode and M. Ribó and J. Rico and C. Righi and A. Rugliancich and L. Saha and N. Sahakyan and T. Saito and S. Sakurai and K. Satalecka and K. Schmidt and T. Schweizer and J. Sitarek and I. Šnidarić and D. Sobczynska and A. Somero and A. Stamerra and D. Strom and M. Strzys and Y. Suda and T. Surić and M. Takahashi and F. Tavecchio and P. Temnikov and T. Terzić and M. Teshima and N. Torres-Albà and L. Tosti and S. Tsujimoto and V. Vagelli and J. van Scherpenberg and G. Vanzo and M. Vazquez Acosta and C. F. Vigorito and V. Vitale and I. Vovk and M. Will and D. Zarić},
journal= {arXiv preprint arXiv:2006.00623},
year = {2020}
}
备注
10 pages, 10 figures. Accepted for publication by A&A. Corresponding authors: Christian Fruck ([email protected]), Ievgen Vovk ([email protected]), Yuki Iwamura ([email protected]) and Marcel Strzys ([email protected])