利用H.E.S.S.望远镜阵列重新审视Westerlund 2天区
高能天体物理现象
2015-05-20 v1
摘要
目的。先前利用H.E.S.S.望远镜阵列的观测揭示了与年轻星团Westerlund 2位置重合的延展甚高能(VHE; E>100 GeV)γ射线发射源HESS J1023-575。在发现时，观测到的发射起源尚未明确识别，因此进行了后续观测以进一步研究该γ射线源的性质。方法。对朝向疏散星团Westerlund 2的Carina区域进行了重新观测，将总曝光时间增加到45.9小时。合并的数据集包括33小时的新数据，现在允许搜索能量依赖的形态和进行详细的光谱分析。结果。发现了一个新的、硬谱VHE γ射线源HESS J1026-582，统计显著性为7σ。它与Fermi LAT脉冲星PSR J1028-5819位置重合。位置重合以及LAT脉冲星的射电/γ射线特征支持TeV发射起源于脉冲星风云的图景。结合深入的H.E.S.S.观测和最近的多波段发现(包括Fermi LAT脉冲星PSR J1022-5746和该区域的巨分子云)，讨论了HESS J1023-575的性质。尽管VHE数据集有所改进，但仍无法明确识别产生HESS J1023-575 VHE发射的天体，来自附近高能脉冲星和/或疏散星团的贡献仍然是一种可能性。
引用
@article{arxiv.1009.3012,
title = {Revisiting the Westerlund 2 Field with the H.E.S.S. Telescope Array},
author = {The HESS Collaboration and A. Abramowski and F. Acero and F. Aharonian and A. G. Akhperjanian and G. Anton and A. Barnacka and U. Barres de Almeida and A. R. Bazer-Bachi and Y. Becherini and J. Becker and B. Behera and K. Bernlöhr and A. Bochow and C. Boisson and J. Bolmont and P. Bordas and V. Borrel and J. Brucker and F. Brun and P. Brun and T. Bulik and I. Büsching and T. Boutelier and S. Casanova and M. Cerruti and P. M. Chadwick and A. Charbonnier and R. C. G. Chaves and A. Cheesebrough and J. Conrad 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 P. Eger and P. Espigat and L. Fallon and C. Farnier and S. Fegan and F. Feinstein and M. V. Fernandes 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 J. D. Hague and D. Hampf 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 P. Hofverberg 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 M. Kerschhaggl and D. Khangulyan and B. Khélifi and D. Keogh and D. Klochkov and W. Kluźniak24 and T. Kneiske and Nu. Komin and K. Kosack and R. Kossakowski and G. Lamanna and J. -P. Lenain and D. Lennarz and T. Lohse and C. -C. Lu and V. Marandon and A. Marcowith and J. Masbou and D. Maurin and T. J. L. McComb and M. C. Medina and J. Méhault and R. Moderski and E. Moulin and M. Naumann-Godo and M. de Naurois and D. Nedbal and D. Nekrassov and N. Nguyen and B. Nicholas and J. Niemiec and S. J. Nolan and S. Ohm and J-F. Olive and E. de Oña Wilhelmi and B. Opitz and K. J. Orford and M. Ostrowski and M. Panter and M. Paz Arribas and G. Pedaletti1 and G. Pelletier and P. -O. Petrucci and S. Pita1 and G. Pühlhofer and M. Punch and A. Quirrenbach and M. Raue and S. M. Rayner and A. Reimer and O. Reimer and M. Renaud and R. de los Reyes and F. Rieger1 and J. Ripken and L. Rob and S. Rosier-Lees and G. Rowell and B. Rudak and C. B. Rulten and J. Ruppel and F. Ryde and V. Sahakian and A. Santangelo and R. Schlickeiser and F. M. Schöck and A. Schönwald and U. Schwanke and S. Schwarzburg and S. Schwemmer and A. Shalchi and I. Sushch and M. Sikora and J. L. Skilton and H. Sol and G. Spengler and Ł. Stawarz and R. Steenkamp and C. Stegmann and F. Stinzing and A. Szostek and P. H. Tam and J. -P. Tavernet and R. Terrier and O. Tibolla and M. Tluczykont and K. Valerius and C. van Eldik and G. Vasileiadis and C. Venter and J. P. Vialle and A. Viana and P. Vincent and M. Vivier and H. J. Völk and F. Volpe and S. Vorobiov and S. J. Wagner and M. Ward and A. A. Zdziarski and A. Zech and H. -S. Zechlin and Y. Fukui and N. Furukawa and A. Ohama and H. Sano and J. Dawson and A. Kawamura},
journal= {arXiv preprint arXiv:1009.3012},
year = {2015}
}
备注
Accepted for publication on A&A