发表机构
Université Paris Cité; CNRS, Astroparticule et Cosmologie; Laboratory of Astrophysics, École Polytechnique Fédérale de Lausanne; Institute for Cosmic Ray Research, The University of Tokyo; Université Paris-Saclay; CEA, CNRS, AIM; Gran Sasso Science Institute; Istituto Nazionale di Fisica Nucleare (INFN), Sez. Padova; INAF - Osservatorio Astronomico di Brera（巴黎西岱大学; 法国国家科学研究中心，亚原子粒子与宇宙学; 洛桑联邦理工学院天体物理学实验室; 东京大学宇宙射线研究所; 巴黎萨克雷大学; 法国原子能委员会，法国国家科学研究中心，天体物理学与分子生物学研究所; 格兰萨索科学研究所; 意大利国家核物理研究所，帕多瓦分部; 意大利国家天体物理研究所，布雷拉天文台）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究提出LHAASO和CTAO/LST-1对GRB 221009A的观测数据支持配对回波模型，并据此约束了星系际磁场强度及相关长度，与现有约束一致。
AI 中文摘要
甚高能伽马射线在星系际介质中传播时的相互作用会产生延迟的次级“配对回波”信号。探测这种配对回波可用于测量宇宙大尺度结构空洞中的星系际磁场（IGMF）。我们注意到，LHAASO和CTAO/LST-1望远镜对伽马射线暴GRB 221009A的数据组合与配对回波模型一致。LST-1在暴发后1.33天对源信号的测量可解释为由甚高能伽马射线在星系际介质中传播产生的配对回波，若其相关长度lambda_B大于20千秒差距，则磁场强度为log(B/G)=-16.2±0.7。若磁场相关长度小于20千秒差距，则磁场强度估计值按(20 kpc / lambda_B)的平方根向上修正。在短相关长度IGMF为宇宙学相变遗迹的具体情况下，LST-1信号的配对回波模型意味着磁场强度在1e-14至1e-12高斯范围内。这样的磁场参数与所有已知的IGMF约束一致，包括来自活动星系核伽马射线观测的下限。
英文摘要
Interactions of very-high energy gamma-rays during their propagation through the intergalactic medium result in a delayed secondary ``pair echo'' signal. Detection of such pair echo can be used for measurements of intergalactic magnetic fields (IGMF) in the voids of the Large Scale Structure of the Universe. We notice that a combination of data of LHAASO and CTAO/LST-1 telescopes on the gamma-ray burst GRB 221009A is consistent with the pair echo model. The LST-1 measurement of the source signal 1.33 days after the burst can be interpreted as the pair echo produced by very-high-energy gamma-rays propagating through intergalactic medium with magnetic field of the strength log(B/G)=-16.2+/- 0.7, if its correlation length lambda_B is larger than 20 kpc. If the field correlation length is shorter than 20 kpc, the field strength estimate is modified upwards by a square root of (20 kpc / lambda_B). In the specific case of short correlation length IGMF that is relic from cosmological phase transitions, the pair echo model of the LST-1 signal implies the field strength in the 1e-14-1e-12 G range. Such magnetic field parameters are consistent with all known constraints on IGMF, including the lower bounds from gamma-ray observations of active galactic nuclei.
Comments6 pages, 3 figures
