AGILE卫星对特殊事件GRB 221009A的伽马射线探测
高能天体物理现象
2024-06-14 v3
摘要
来自爆发性宇宙事件的MeV-GeV范围伽马射线辐射,对理解中子星与黑洞形成相关物理过程极具价值。本文报道AGILE卫星在MeV-GeV能段对长时标特殊伽马暴GRB 221009A的探测。AGILE星载探测器在该暴初始关键阶段对其具有良好曝光。prompt相的硬X射线/MeV辐射持续数百秒,最强辐射出现于初始触发后200至300秒间。AGILE在prompt与早期余辉相直至10,000秒探测到极强GeV伽马射线辐射。时间分辨光谱分析显示随时间变化的MeV峰值辐射与强烈的幂律GeV辐射同时出现,并持续至余辉相。prompt相中极强MeV辐射与高度非热且硬化的GeV辐射共存是GRB 221009A的显著特征。该事件在prompt相呈现光谱不同的MeV与GeV辐射,最可能由不同位置发生的物理机制产生。AGILE观测提供了关于GRB 221009A早期阶段的关键通量与光谱伽马射线信息,而此期间亦有TeV范围辐射的报道。
引用
@article{arxiv.2309.10515,
title = {AGILE gamma-ray detection of the exceptional GRB 221009A},
author = {M. Tavani and G. Piano and A. Bulgarelli and L. Foffano and A. Ursi and F. Verrecchia and C. Pittori and C. Casentini and A. Giuliani and F. Longo and G. Panebianco and A. Di Piano and L. Baroncelli and V. Fioretti and N. Parmiggiani and A. Argan and A. Trois and S. Vercellone and M. Cardillo and L. A. Antonelli and G. Barbiellini and P. Caraveo and P. W. Cattaneo and A. W. Chen and E. Costa and E. Del Monte and G. Di Cocco and I. Donnarumma and Y. Evangelista and M. Feroci and F. Gianotti and C. Labanti and F. Lazzarotto and P. Lipari and F. Lucarelli and M. Marisaldi and S. Mereghetti and A. Morselli and L. Pacciani and A. Pellizzoni and F. Perotti and P. Picozza and M. Pilia and M. Rapisarda and A. Rappoldi and A. Rubini and P. Soffitta and M. Trifoglio and V. Vittorini and F. D'Amico},
journal= {arXiv preprint arXiv:2309.10515},
year = {2024}
}
备注
Accepted for publication in ApJL on September 19, 2023. Published online on October 17, 2023. Revised Figure 5 (June 13, 2024)