利用 Fermi-LAT 与 H.E.S.S. 耀变体观测约束星系际磁场
高能天体物理现象
2023-06-22 v1 宇宙学与河外天体物理
摘要
星系和星系团中的磁场被认为是宇宙大尺度结构形成过程中星系际种子场放大的结果。然而，该星系际磁场（IGMF）的起源、强度和形态仍未知。对遥远耀变体高能伽马射线的观测可获得 IGMF 的下限（或间接探测）。伽马射线与河外背景光相互作用产生电子-正电子对，后者可进而引发电磁级联。级联的 射线特征依赖于 IGMF，因其使这些电子对发生偏转。本文报道利用费米大面积望远镜（Fermi Large Area Telescope）与高能立体系统（High Energy Stereoscopic System）的联合数据集对该级联辐射的新搜寻。利用最先进的级联信号蒙特卡洛预测，我们的结果在相干长度为 1 Mpc 时给出 IGMF 下限 G，即便假设耀变体占空比短至 10 年也是如此。这比先前下限改善了 2 倍。对于 （）年的较长占空比，低于 G（ G）的 IGMF 强度被排除，从而排除了早期宇宙中 IGMF 生成的特定模型。
引用
@article{arxiv.2306.05132,
title = {Constraints on the intergalactic magnetic field using Fermi-LAT and H.E.S.S. blazar observations},
author = {H. E. S. S. and Fermi-LAT Collaborations and : and F. Aharonian and J. Aschersleben and M. Backes and V. Barbosa Martins and R. Batzofin and Y. Becherini and D. Berge and B. Bi and M. Bouyahiaoui 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 J. Celic and M. Cerruti and T. Chand and S. Chandra and A. Chen and J. Chibueze and O. Chibueze and G. Cotter and M. de Bony 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 M. -H. Grondin and L. Haerer and T. L. Holch and M. Holler and D. Horns and M. Jamrozy and F. Jankowsky and V. Joshi and I. Jung-Richardt and E. Kasai and K. Katarzynński 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 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 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 T. Murach and K. Nakashima and J. Niemiec 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 D. A. Prokhorov and H. Prokoph and G. Pühlhofer and M. Punch and A. Quirrenbach and P. Reichherzer and A. Reimer and O. Reimer and B. Reville and F. Rieger and G. Rowell and B. Rudak and E. Ruiz-Velasco and V. Sahakian and D. A. Sanchez and M. Sasaki and F. Schüussler and H. M. Schutte and U. Schwanke and J. N. S. Shapopi and H. Sol and S. Spencer and S. Steinmassl and H. Suzuki and T. Takahashi and T. Tanaka and A. M. Taylor and R. Terrier and C. Thorpe-Morgan and M. Tsirou and N. Tsuji and Y. Uchiyama and C. van Eldik and J. Veh and C. Venter 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 S. Zouari and N. Zywucka},
journal= {arXiv preprint arXiv:2306.05132},
year = {2023}
}
备注
20 pages, 7 figures, 4 tables. Accepted for publication in ApJ Letters. Auxiliary data is provided in electronic format at https://zenodo.org/record/8014311