TeV afterglow from GRB 221009A: photohadronic origin?

Q1 Earth and Planetary Sciences Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2024-07-01 DOI:10.1093/mnrasl/slae063

S. Sahu, B. Medina-Carrillo, D. I. P'aez-S'anchez, G. S'anchez-Col'on, Subhash Rajpoot

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Abstract

Gamma-ray burst (GRB), GRB 221009A, a long-duration GRB, was observed simultaneously by the Water Cherenkov Detector Array (WCDA) and the Kilometer Squared Array (KM2A) of the Large High Altitude Air Shower Observatory (LHAASO) during the prompt emission and the afterglow periods. Characteristic multi-TeV photons up to 13 TeV were observed in the afterglow phase. The observed very high-energy (VHE) gamma-ray spectra by WCDA and KM2A during different time intervals and in different energy ranges can be explained very well in the context of the photohadronic model with the inclusion of extragalactic background light models. In the photohadronic scenario, interaction of high-energy protons with the synchrotron self-Compton (SSC) photons in the forward shock region of the jet is assumed to be the source of these VHE photons. The observed VHE spectra from the afterglow of GRB 221009A are similar to the VHE gamma-ray spectra observed from the temporary extreme high-energy peaked BL Lac (EHBL), 1ES 2344+514 only during the 11th and the 12th of August, 2016. Such spectra are new and have been observed for the first time in a GRB.

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GRB 221009A 的 TeV 余辉：光电子起源？

大型高空气流淋浴天文台（LHAASO）的水切伦科夫探测器阵列（WCDA）和千米平方阵列（KM2A）同时观测了伽马射线暴（GRB）--GRB 221009A，这是一个持续时间很长的伽马射线暴。在余辉阶段观测到了高达 13 TeV 的特征性多 TeV 光子。WCDA和KM2A在不同时间间隔和不同能量范围内观测到的极高能伽马射线光谱，可以很好地用包含银河系外背景光模型的光电子模型来解释。在光电子模型中，高能质子与同步加速器自康普顿（SSC）光子的相互作用被假定为这些甚高频光子的来源。从GRB 221009A余辉中观测到的VHE光谱与2016年8月11日和12日从临时极高能峰BL Lac（EHBL）1ES 2344+514中观测到的VHE伽马射线光谱相似。这种光谱是首次在GRB中观测到的新光谱。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Monthly Notices of the Royal Astronomical Society: Letters Earth and Planetary Sciences-Space and Planetary Science

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8.80

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136

期刊介绍： For papers that merit urgent publication, MNRAS Letters, the online section of Monthly Notices of the Royal Astronomical Society, publishes short, topical and significant research in all fields of astronomy. Letters should be self-contained and describe the results of an original study whose rapid publication might be expected to have a significant influence on the subsequent development of research in the associated subject area. The 5-page limit must be respected. Authors are required to state their reasons for seeking publication in the form of a Letter when submitting their manuscript.

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