发现硬谱甚高能伽马射线源 HESS J1641-463
高能天体物理现象
2014-10-08 v3
摘要
本文报告了高能立体系统 (H.E.S.S.) 在甚高能 (VHE) 波段发现的一个具有显著硬谱的源 HESS J1641-463。由于与附近明亮源 HESS J1640-465 的混淆，HESS J1641-463 在常规分析技术下未被察觉。在将分析限制为能量高于 4 TeV 的事件后，它以 8.5 倍标准差的显著性水平显现。该源显示出中等流量水平 F(E > 1 TeV) = (3.64 +/- 0.44_stat +/- 0.73_sys) x 10^-13 cm^-2s-1，相当于同一能量以上 Crab 星云流量的 1.8%，并具有光子指数 Gamma = 2.07 +/- 0.11_stat +/- 0.20_sys 的硬谱。它是一个点状源，尽管由于 H.E.S.S. 点扩散函数 (PSF) 的不确定性，不能排除高达高斯宽度 sigma = 3 arcmin 的延展。检查从逐年到 28 分钟曝光时间尺度的时间分箱后，发现 HESS J1641-463 的 VHE 伽马射线流量在观测期间保持恒定。HESS J1641-463 在位置上与射电超新星遗迹 SNR G338.5+0.1 重合。没有明显的 X 射线候选体与之关联，然而 Chandra 和 XMM-Newton 数据揭示了一些潜在的微弱对应体。本文讨论了各种 VHE 伽马射线产生情景。如果 HESS J1641-463 的辐射是由宇宙线质子与环境气体碰撞产生的，那么它们的能谱必须延伸至接近 1 PeV。该天体可能代表了对银河宇宙线流量在“膝”区附近有显著贡献的源群。
引用
@article{arxiv.1408.5280,
title = {Discovery of the hard spectrum VHE gamma-ray source HESS J1641-463},
author = {H. E. S. S. Collaboration and : and A. Abramowski and F. Aharonian and F. Ait Benkhali and A. G. Akhperjanian and E. O. Angüner and M. Backes and S. Balenderan and A. Balzer and A. Barnacka and Y. Becherini and J. Becker Tjus and D. Berge and S. Bernhard and K. Bernlöhr and E. Birsin and J. Biteau and M. Böttcher and C. Boisson and J. Bolmont and P. Bordas and J. Bregeon and F. Brun and P. Brun and M. Bryan and T. Bulik and S. Carrigan and S. Casanova and P. M. Chadwick and N. Chakraborty and R. Chalme-Calvet and R. C. G. Chaves and M. Chrétien and S. Colafrancesco and G. Cologna and J. Conrad and C. Couturier and Y. Cui and M. Dalton and I. D. Davids and B. Degrange and C. Deil and P. deWilt and A. Djannati-Ataï and W. Domainko and A. Donath and L. O'C. Drury and G. Dubus and K. Dutson and J. Dyks and M. Dyrda and T. Edwards and K. Egberts and P. Eger and P. Espigat and C. Farnier and S. Fegan and F. Feinstein and M. V. Fernandes and D. Fernandez and A. Fiasson and G. Fontaine and A. Förster and M. Füßling and S. Gabici and M. Gajdus and Y. A. Gallant and T. Garrigoux and G. Giavitto and B. Giebels and J. F. Glicenstein and D. Gottschall and M. -H. Grondin and M. Grudzińska and D. Hadasch and S. Häffner and J. Hahn and J. Harris and G. Heinzelmann and G. Henri and G. Hermann and O. Hervet and A. Hillert and J. A. Hinton and W. Hofmann and P. Hofverberg and M. Holler and D. Horns and A. Ivascenko and A. Jacholkowska and C. Jahn and M. Jamrozy and M. Janiak and F. Jankowsky and I. Jung-Richardt and M. A. Kastendieck and K. Katarzyński and U. Katz and S. Kaufmann and B. Khélifi and M. Kieffer and S. Klepser and D. Klochkov and W. Kluźniak and D. Kolitzus and Nu. Komin and K. Kosack and S. Krakau and F. Krayzel and P. P. Krüger and H. Laffon and G. Lamanna and J. Lau and J. Lefaucheur and V. Lefranc and A. Lemière and M. Lemoine-Goumard and J. -P. Lenain and T. Lohse and A. Lopatin and C. -C. Lu and V. Marandon and A. Marcowith and R. Marx and G. Maurin and N. Maxted and M. Mayer and T. J. L. McComb and J. Méhault and P. J. Meintjes and U. Menzler and M. Meyer and A. M. W. Mitchell and R. Moderski and M. Mohamed and K. Morå and E. Moulin and T. Murach and M. de Naurois and J. Niemiec and S. J. Nolan and L. Oakes and H. Odaka and S. Ohm and B. Opitz and M. Ostrowski and I. Oya and M. Panter and R. D. Parsons and M. Paz Arribas and N. W. Pekeur and G. Pelletier and P. -O. Petrucci and B. Peyaud and S. Pita and H. Poon and G. Pühlhofer and M. Punch and A. Quirrenbach and S. Raab and I. Reichardt and A. Reimer and O. Reimer and M. Renaud and R. de los Reyes and F. Rieger and C. Romoli and S. Rosier-Lees and G. Rowell and B. Rudak and C. B. Rulten and V. Sahakian and D. Salek and D. A. Sanchez and A. Santangelo and R. Schlickeiser and F. Schüssler and A. Schulz and U. Schwanke and S. Schwarzburg and S. Schwemmer and H. Sol and F. Spanier and G. Spengler and F. Spies and Ł. Stawarz and R. Steenkamp and C. Stegmann and F. Stinzing and K. Stycz and I. Sushch and J. -P. Tavernet and T. Tavernier and A. M. Taylor and R. Terrier and M. Tluczykont and C. Trichard and K. Valerius and C. van Eldik and B. van Soelen and G. Vasileiadis and J. Veh and C. Venter and A. Viana and P. Vincent and J. Vink and H. J. Völk and F. Volpe and M. Vorster and T. Vuillaume and S. J. Wagner and P. Wagner and R. M. Wagner and M. Ward and M. Weidinger and Q. Weitzel and R. White and A. Wierzcholska and P. Willmann and A. Wörnlein and D. Wouters and R. Yang and V. Zabalza and D. Zaborov and M. Zacharias and A. A. Zdziarski and A. Zech and H. -S. Zechlin and Y. Fukui and H. Sano and T. Fukuda and S. Yoshiike},
journal= {arXiv preprint arXiv:1408.5280},
year = {2014}
}
备注
24 pages, 4 figures. Published version