利用 H.E.S.S. 和 Fermi-LAT 表征 PKS 2155-304 的伽马射线长期变异性
高能天体物理现象
2017-02-01 v1
摘要
研究 BL Lac 天体在最高能量下的时间变异性，为理解相对论性喷流和超大质量黑洞附近发生的极端物理过程提供了独特的视角。为此，我们在高能（HE, 100 MeV < E < 300 GeV）和甚高能（VHE, E > 200 GeV）伽马射线波段分析了 BL Lac 天体 PKS 2155-304 的长期变异性。在约 9 年的 H.E.S.S. 观测过程中，宁静状态下的 VHE 光变曲线符合对数正态行为。该状态下的 VHE 变异性在大于一天的时间尺度上可由闪烁噪声（功率谱密度指数 β_VHE = 1.10 +0.10 -0.13）很好地描述。对 5.5 年 HE Fermi LAT 数据的分析给出了一致的结果（β_HE = 1.20 +0.21 -0.23，在大于 10 天的时间尺度上），与 VHE 的发现相符。HE 和 VHE 的功率谱密度在所探测的时间范围内显示出尺度不变性。VHE 和 HE 通量之间的直接线性相关既不能被排除，也不能被明确确立。我们讨论了这些长期变异性特征，并将其与 VHE 耀发状态期间在较短时间尺度上看到的红噪声行为（β ~ 2）进行了比较。宁静和耀发状态下 VHE 能段功率谱噪声行为的差异，为这些状态受不同物理过程影响提供了证据，而 HE 和 VHE 长期结果的一致性则暗示可能存在一个共同的物理联系，例如由潜在的喷流-吸积盘连接所引入。
引用
@article{arxiv.1610.03311,
title = {Characterizing the gamma-ray long-term variability of PKS 2155-304 with H.E.S.S. and Fermi-LAT},
author = {H. E. S. S. Collaboration and H. Abdalla and A. Abramowski and F. Aharonian and F. Ait Benkhali and A. G. Akhperjanian T. Andersson and M. Arrieta and P. Aubert and M. Backes and A. Balzer and M. Barnard and Y. Becherini and J. Becker Tjus and D. Berge S. Bernhard and K. Bernlöhr and R. Blackwell 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 M. Capasso and J. Carr S. Casanova and M. Cerruti and N. Chakraborty and R. Chalme-Calvet and R. C. G. Chaves and A. Chen and J. Chevalier and M. Chrétien and S. Colafrancesco and G. Cologna and B. Condon and J. Conrad and Y. Cui and I. D. Davids and J. Decock and B. Degrange and C. Deil and J. Devin and P. deWilt and L. Dirson 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 T. Edwards and K. Egberts and P. Eger and J. -P. Ernenwein and S. Eschbach and C. Farnier and S. Fegan and M. V. Fernandes and A. Fiasson and G. Fontaine and A. Förster and S. Funk and M. Füßling and S. Gabici M. Gajdus and Y. A. Gallant and T. Garrigoux and G. Giavitto and B. Giebels and J. F. Glicenstein and D. Gottschall and A. Goyal and M. -H. Grondin and D. Hadasch and J. Hahn and M. Haupt and J. Hawkes and G. Heinzelmann and G. Henri and G. Hermann and O. Hervet and J. A. Hinton and W. Hofmann and C. Hoischen and M. Holler and D. Horns and A. Ivascenko and A. Jacholkowska and M. Jamrozy and M. Janiak and D. Jankowsky and F. Jankowsky and M. Jingo and T. Jogler and L. Jouvin and I. Jung-Richardt and M. A. Kastendieck and K. Katarzyński and U. Katz and D. Kerszberg and B. Khélifi and M. Kieffer and J. King and S. Klepser and D. Klochkov and W. Kluźniak and D. Kolitzus and Nu. Komin and K. Kosack and S. Krakau and M. Kraus and F. Krayzel and P. P. Krüger and H. Laffon and G. Lamanna and J. Lau and J. -P. Lees and J. Lefaucheur and V. Lefranc and A. Lemière and M. Lemoine-Goumard and J. -P. Lenain and E. Leser and T. Lohse and M. Lorentz and R. Liu and R. López-Coto and I. Lypova and V. Marandon and A. Marcowith and C. Mariaud and R. Marx and G. Maurin and N. Maxted and M. Mayer and P. J. Meintjes and M. Meyer and A. M. W. Mitchell and R. Moderski and M. Mohamed and L. Mohrmann and K. Morå and E. Moulin and T. Murach and M. deNaurois and F. Niederwanger and J. Niemiec and L. Oakes and P. O'Brien and H. Odaka and S. Öttl and S. Ohm and M. Ostrowski and I. Oya and M. Padovani and M. Panter and R. D. Parsons and N. W. Pekeur and G. Pelletier and C. Perennes and P. -O. Petrucci and B. Peyaud and Q. Piel S. Pita and H. Poon and D. Prokhorov and H. Prokoph and G. Pühlhofer and M. Punch and A. Quirrenbach and S. Raab and A. Reimer and O. Reimer and M. Renaud and R. delosReyes 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 M. Sasaki and R. Schlickeiser and F. Schüssler and A. Schulz and U. Schwanke and S. Schwemmer and M. Settimo and A. S. Seyffert and N. Shafi and I. Shilon and R. Simoni 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 L. Tibaldo and D. Tiziani and M. Tluczykont and C. Trichard and R. Tuffs and Y. Uchiyama and D. J. van der Walt and C. vanEldik and C. vanRensburg and B. vanSoelen and G. Vasileiadis and J. Veh and C. Venter and A. Viana and P. Vincent and J. Vink and F. Voisin and H. J. Völk and T. Vuillaume and Z. Wadiasingh and S. J. Wagner and P. Wagner and R. M. Wagner 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 F. Zefi and A. Ziegler and N. Żywucka},
journal= {arXiv preprint arXiv:1610.03311},
year = {2017}
}
备注
11 pages, 16 figures