伽马射线暴余辉深处的甚高能成分
高能天体物理现象
2019-11-21 v1
摘要
伽马射线暴（GRBs）是短暂的伽马射线闪现，被认为是宇宙中最具能量的爆发现象。GRBs 的辐射包括短暂（通常数十秒）而明亮的瞬时辐射，随后是长得多的余辉阶段。在余辉阶段，由抛射物质与暴周介质相互作用产生的激波外流减速，并观测到亮度逐渐下降。GRBs 通常通过其能量在千电子伏至兆电子伏范围内的伽马射线发射大部分能量，但空间仪器已探测到少数能量达数十吉电子伏的光子。然而，此类高能（高于 1 吉电子伏）光子的起源以及甚高能（高于 100 吉电子伏）辐射的存在一直难以捉摸。本文报道在明亮的 GRB 180720B 余辉深处——即瞬时辐射阶段结束十小时后，当时 X 射线流量已衰减四个数量级——观测到的甚高能辐射。对于观测到的辐射有两种可能的解释：逆康普顿辐射与超相对论电子的同步辐射。我们的观测表明，X 射线与伽马射线能段的能量通量及其光子指数在整个余辉期间彼此保持可比。这一发现对两种辐射机制下的 GRB 环境施加了明确的约束，其中逆康普顿解释缓解了晚期观测辐射对粒子能量的要求。该探测的晚期时间对未来最高能段 GRB 的观测具有影响。
引用
@article{arxiv.1911.08961,
title = {A very-high-energy component deep in the Gamma-ray Burst afterglow},
author = {H. Abdalla R. Adam F. Aharonian F. Ait Benkhali E. O. Anguener M. Arakawa and C. Arcaro and C. Armand and H. Ashkar and M. Backes and V. Barbosa Martins and M. Barnard Y. Becherini and D. Berge and K. Bernloehr and E. Bissaldi and R. Blackwell and M. Boettcher and C. Boisson and J. Bolmont and S. Bonnefoy and J. Bregeon and M. Breuhaus and F. Brun and P. Brun and M. Bryan and M. Buechele and T. Bulik and T. Bylund and M. Capasso and S. Caroff and A. Carosi and S. Casanova and M. Cerruti and T. Chand and S. Chandra and A. Chen and S. Colafrancesco and M. Curylo and I. D. Davids and C. Deil and J. Devin and P. deWilt and L. Dirson and A. Djannati-Atai and A. Dmytriiev and A. Donath and V. Doroshenko and J. Dyks and K. Egberts and G. Emery and J. -P. Ernenwein and S. Eschbach and K. Feijen and S. Fegan and A. Fiasson and G. Fontaine and S. Funk and M. Fuessling and S. Gabici and Y. A. Gallant and F. Gate and G. Giavitto and L. Giunti and D. Glawion and J. F. Glicenstein and D. Gottschall and M. -H. Grondin and J. Hahn and M. Haupt and G. Heinzelmann and G. Henri and G. Hermann and J. A. Hinton and W. Hofmann and C. Hoischen and T. L. Holch and M. Holler and D. Horns and D. Huber and H. Iwasaki and M. Jamrozy and D. Jankowsky and F. Jankowsky and A. Jardin-Blicq and I. Jung-Richardt and M. A. Kastendieck and K. Katarzynski and M. Katsuragawa and U. Katz and D. Khangulyan and B. Khelifi and J. King and S. Klepser and W. Kluzniak and N. Komin and K. Kosack and D. Kostunin and M. Kreter and G. Lamanna and A. Lemiere and M. Lemoine-Goumard and J. -P. Lenain and E. Leser and C. Levy and T. Lohse and I. Lypova and J. Mackey and J. Majumdar and D. Malyshev and V. Marandon and A. Marcowith and A. Mares and C. Mariaud and G. Marti-Devesa and R. Marx and G. Maurin and P. J. Meintjes and A. M. W. Mitchell and R. Moderski and M. Mohamed and L. Mohrmann and C. Moore and E. Moulin and J. Muller and T. Murach and S. Nakashima and M. de Naurois and H. Ndiyavala and F. Niederwanger and J. Niemiec and L. Oakes and P. O Brien and H. Odaka and S. Ohm and E. de Ona Wilhelmi and M. Ostrowski and I. Oya and M. Panter and R. D. Parsons and C. Perennes and P. -O. Petrucci and B. Peyaud and Q. Piel and S. Pita and V. Poireau and A. Priyana Noel and D. A. Prokhorov and H. Prokoph and G. Puehlhofer and M. Punch and A. Quirrenbach and S. Raab and R. Rauth and A. Reimer and O. Reimer and Q. Remy and M. Renaud and F. Rieger and L. Rinchiuso and C. Romoli and G. Rowell and B. Rudak and E. Ruiz-Velasco and V. Sahakian and S. Sailer and S. Saito and D. A. Sanchez and A. Santangelo and M. Sasaki and R. Schlickeiser and F. Schuessler and A. Schulz and H. M. Schutte and U. Schwanke and S. Schwemmer and M. Seglar-Arroyo and M. Senniappan and A. S. Seyffert and N. Shafi and K. Shiningayamwe and R. Simoni and A. Sinha and H. Sol and A. Specovius and M. Spir-Jacob and L. Stawarz and R. Steenkamp and C. Stegmann and C. Steppa and T. Takahashi and T. Tavernier and A. M. Taylor and R. Terrier and D. Tiziani and M. Tluczykont and C. Trichard and M. Tsirou and N. Tsuji and R. Tuffs and Y. Uchiyama and D. J. van der Walt and C. van Eldik and C. van Rensburg and B. van Soelen and G. Vasileiadis and J. Veh and C. Venter and P. Vincent and J. Vink and H. J. Voelk and T. Vuillaume and Z. Wadiasingh and S. J. Wagner and R. White and A. Wierzcholska and R. Yang and H. Yoneda and M. Zacharias and R. Zanin and A. A. Zdziarski and A. Zech and A. Ziegler and J. Zorn and N. Zywucka and F. de Palma and M. Axelsson and O. J. Roberts},
journal= {arXiv preprint arXiv:1911.08961},
year = {2019}
}
备注
Preprint version of Nature paper. Contacts: E.Ruiz-Velasco, F. Aharonian, E.Bissaldi, C.Hoischen, R.D Parsons, Q.Piel, A.Taylor, D.Khangulyan