从BL Lac天体PKS 0548-322发现甚高能伽马射线
高能天体物理现象
2015-05-19 v2
摘要
PKS 0548-322 (z=0.069)是一个“高峰频率”BL Lac天体，由于其高X射线和射电流量，它是一个候选甚高能（VHE，E>100 GeV）伽马射线发射源。对VHE波段的观测提供了对该源中存在的极高能粒子起源以及起作用的辐射过程的见解。我们报告了2004年10月至2008年1月期间使用H.E.S.S.阵列（四个成像大气切伦科夫望远镜）进行的观测。还报告了2006年11月Swift卫星的同时期紫外和X射线观测。PKS 0548-322首次在VHE波段被H.E.S.S.探测到。我们测量到216个伽马射线的超出，对应5.6个标准差的显著性。源的光子谱由幂律描述，光子指数为Gamma=2.86 +/- 0.34（统计） +/- 0.10（系统）。200 GeV以上的积分通量为蟹状星云通量的1.3%，且随时间恒定。同时期的Swift/XRT观测揭示了2至10 keV之间的X射线通量为F_{2-10 keV}=2.3 +/- 0.2 x 10^{-11} erg.cm^{-2}. s^{-1}，与之前的观测相比处于中间强度状态。能谱分布可以使用简单的单区同步自康普顿模型再现，其参数与观测到的其他此类源相似。
引用
@article{arxiv.1006.5289,
title = {Discovery of VHE gamma-rays from the BL Lac object PKS 0548-322},
author = {H. E. S. S. collaboration and : and F. Aharonian and A. G. Akhperjanian and G. Anton and U. Barres de Almeida and A. R. Bazer-Bachi and Y. Becherini and B. Behera and W. Benbow and K. Bernlöhr and A. Bochow and C. Boisson and J. Bolmont and V. Borrel and J. Brucker and F. Brun and P. Brun and R. Bühler and T. Bulik and I. Büsching and T. Boutelier and P. M. Chadwick and A. Charbonnier and R. C. G. Chaves and A. Cheesebrough and L. -M. Chounet and A. C. Clapson and G. Coignet and M. Dalton and M. K. Daniel and I. D. Davids and B. Degrange and C. Deil and H. J. Dickinson and A. Djannati-Ataï and W. Domainko and L. O'C. Drury and F. Dubois and G. Dubus and J. Dyks and M. Dyrda and K. Egberts and D. Emmanoulopoulos and P. Espigat and C. Farnier and F. Feinstein and A. Fiasson and A. Förster and G. Fontaine and M. Füssling and S. Gabici and Y. A. Gallant and L. Gérard and D. Gerbig and B. Giebels and J. F. Glicenstein and B. Glück and P. Goret and D. Göring and D. Hauser and M. Hauser and S. Heinz and G. Heinzelmann and G. Henri and G. Hermann and J. A. Hinton and A. Hoffmann and W. Hofmann and M. Holleran and S. Hoppe and D. Horns and A. Jacholkowska and O. C. de Jager and C. Jahn and I. Jung and K. Katarzyński and U. Katz and S. Kaufmann and E. Kendziorra and M. Kerschhagg and D. Khangulyan and B. Khélifi and D. Keogh and W. Kluźniak and T. Kneiske and Nu. Komin and K. Kosack and G. Lamanna and J. -P. Lenain and T. Lohse and V. Marandon and J. M. Martin and O. Martineau-Huynh and A. Marcowith and J. Masbou and D. Maurin and T. J. L. McComb and M. C. Medina and R. Moderski and E. Moulin and M. Naumann-Godo and M. de Naurois and D. Nedbal and D. Nekrassov and B. Nicholas and J. Niemiec and S. J. Nolan and S. Ohm and J-F. Olive and E. de Oña Wilhelm and K. J. Orford and M. Ostrowski and M. Panter and M. Paz Arribas and G. Pedaletti and G. Pelletier and P. -O. Petrucci and S. Pita and G. Pühlhofer and M. Punch and A. Quirrenbach and B. C. Raubenheimer and M. Raue and S. M. Rayner and M. Renaud and F. Rieger and J. Ripken and L. Rob and S. Rosier-Lees and G. Rowell and B. Rudak and C. B. Rulten and J. Ruppel and V. Sahakian and A. Santangelo and R. Schlickeiser and F. M. Schöck and R. Schröder and U. Schwanke and S. Schwarzburg and S. Schwemmer and A. Shalchi and M. Sikora and J. L. Skilton and H. Sol and D. Spangler and L. Stawarz and R. Steenkamp and C. Stegmann and F. Stinzing and G. Superina and A. Szostek and P. H. Tam and J. -P. Tavernet and R. Terrier and O. Tibolla and M. Tluczykont and C. van Eldik and G. Vasileiadis and C. Venter and L. Venter and J. P. Vialle and P. Vincent and M. Vivier and H. J. Völk and F. Volp and S. J. Wagner and M. Ward and A. A. Zdziarski and A. Zech},
journal= {arXiv preprint arXiv:1006.5289},
year = {2015}
}
备注
6 pages, 3 figures, Accepted for publication in Astronomy and Astrophysics