基于TeV光子光深的GRB 221009A的喷射洛伦兹因子约束

IF 8.8 1区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS Astrophysical Journal Letters Pub Date : 2023-10-01 DOI:10.3847/2041-8213/acfed1

Duan-Yuan Gao, Yuan-Chuan Zou

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引用次数: 0

摘要

最近从破纪录的伽马射线暴GRB 221009A中探测到的太电子伏(TeV)光子对其洛伦兹因子的限制提出了挑战。考虑到两区模型，我们重新评估了射流洛伦兹因子的约束条件，其中TeV光子来自外部激波区，而较低能量的MeV光子来自内部瞬发区。通过适当考虑MeV光子光谱和光曲线的演化，我们计算出了TeV光子的光深度，并得出了最小洛伦兹因子约为300。这与TeV发射的余辉模型是一致的。

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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Jet Lorentz Factor Constraint for GRB 221009A Based on the Optical Depth of the TeV Photons

Abstract The recent detection of teraelectronvolt (TeV) photons from the record-breaking gamma-ray burst GRB 221009A during its prompt phase poses challenges for constraining its Lorentz factor. We reevaluate the constraints on the jet Lorentz factor considering a two-zone model, wherein the TeV photons originate from the external shock region while the lower-energy MeV photons come from the internal prompt emission region. By properly accounting for the evolution of the MeV photon spectrum and light curve, we calculate the optical depth for TeV photons and derive a minimum Lorentz factor of about 300. It is consistent with the afterglow modeling for the TeV emission.

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来源期刊

Astrophysical Journal Letters ASTRONOMY & ASTROPHYSICS-

CiteScore

14.10

自引率

6.30%

发文量

513

审稿时长

2-3 weeks

期刊介绍： The Astrophysical Journal Letters (ApJL) is widely regarded as the foremost journal for swiftly disseminating groundbreaking astronomical research. It focuses on concise reports that highlight pivotal advancements in the field of astrophysics. By prioritizing timeliness and the generation of immediate interest among researchers, ApJL showcases articles featuring novel discoveries and critical findings that have a profound effect on the scientific community. Moreover, ApJL ensures that published articles are comprehensive in their scope, presenting context that can be readily comprehensible to scientists who may not possess expertise in the specific disciplines covered.