利用 \textit{Fermi} LAT 对恒星形成星系的 GeV 观测
高能天体物理现象
2015-06-05 v1
摘要
伽马射线望远镜最近对星暴星系 M82 和 NGC 253 的探测表明，快速形成大质量恒星的星系在伽马射线能量上比其宁静亲属更亮。基于这些结果，我们利用 \textit{Fermi} 伽马射线空间望远镜 (\textit{Fermi}) 上的大面积望远镜 (LAT) 收集的 3 年数据，考察了 69 个矮星系、旋涡星系以及明亮和超亮红外星系在 0.1-100 GeV 光子能量下的样本。利用显著探测源的测量通量和其余星系的通量上限，我们探索了星系中宇宙射线的物理机制。我们发现了进一步证据，证明伽马射线光度与射电连续谱光度以及总红外光度之间存在准线性标度关系，这些关系既适用于本星系群的宁静星系，也适用于低红移星暴星系（考虑统计和系统不确定性的保守 值 ）。这些标度关系的归一化对应于恒星形成率为 1 yr 的星系的光度比： 和 ，假设采用 Chabrier 初始质量函数。利用红外光度与伽马射线光度之间的关系，估计红移 处未分辨恒星形成星系在 0.1 GeV 以上的集体强度为 0.4-2.4 ph cm s sr（占 LAT 测量的各向同性弥散成分强度的 4-23%）。我们预计在为期 10 年的 \textit{Fermi} 任务期间，约有 个星系可通过其宇宙射线诱导的伽马射线发射被探测到。
引用
@article{arxiv.1206.1346,
title = {GeV Observations of Star-forming Galaxies with \textit{Fermi} LAT},
author = {Fermi LAT Collaboration and M. Ackermann and M. Ajello and A. Allafort and L. Baldini and J. Ballet and D. Bastieri and K. Bechtol and R. Bellazzini and B. Berenji and E. D. Bloom and E. Bonamente and A. W. Borgland and A. Bouvier and J. Bregeon and M. Brigida and P. Bruel and R. Buehler and S. Buson and G. A. Caliandro and R. A. Cameron and P. A. Caraveo and J. M. Casandjian and C. Cecchi and E. Charles and A. Chekhtman and C. C. Cheung and J. Chiang and A. N. Cillis and S. Ciprini and R. Claus and J. Cohen-Tanugi and J. Conrad and S. Cutini and F. De Palma and C. D. Dermer and S. W. Digel and E. Do Couto e Silva and P. S. Drell and A. Drlica-Wagner and C. Favuzzi and S. J. Fegan and P. Fortin and Y. Fukazawa and S. Funk and P. Fusco and F. Gargano and D. Gasparrini and S. Germani and N. Giglietto and F. Giordano and T. Glanzman and G. Godfrey and I. A. Grenier and S. Guiriec and M. Gustafsson and D. Hadasch and M. Hayashida and E. Hays and R. E. Hughes and G. Jóhannesson and A. S. Johnson and T. Kamae and H. Katagiri and J. Kataoka and J. Knödlseder and M. Kuss and J. Lande and F. Longo and F. Loparco and B. Lott and M. N. Lovellette and P. Lubrano and G. M. Madejski and P. Martin and M. N. Mazziotta and J. E. McEnery and P. F. Michelson and T. Mizuno and C. Monte and M. E. Monzani and A. Morselli and I. V. Moskalenko and S. Murgia and S. Nishino and J. P. Norris and E. Nuss and M. Ohno and T. Ohsugi and A. Okumura and N. Omodei and E. Orlando and M. Ozaki and D. Parent and M. Persic and M. Pesce-Rollins and V. Petrosian and M. Pierbattista and F. Piron and G. Pivato and T. A. Porter and S. Rainò and R. Rando and M. Razzano and A. Reimer and O. Reimer and S. Ritz and M. Roth and C. Sbarra and C. Sgrò and E. J. Siskind and G. Spandre and P. Spinelli and \{L}ukasz Stawarz and A. W. Strong and H. Takahashi and T. Tanaka and J. B. Thayer and L. Tibaldo and M. Tinivella and D. F. Torres and G. Tosti and E. Troja and Y. Uchiyama and J. Vandenbroucke and G. Vianello and V. Vitale and A. P. Waite and M. Wood and Z. Yang},
journal= {arXiv preprint arXiv:1206.1346},
year = {2015}
}
备注
Accepted for publication in ApJ. 33 pages, 12 figures