100 MeV 至 820 GeV 能段各向同性弥散伽马射线辐射的能谱
高能天体物理现象
2015-06-02 v1
摘要
伽马射线天空可分解为单独探测到的源、归因于银河宇宙射线与气体及辐射场相互作用的弥散辐射，以及通常被称为各向同性弥散伽马射线背景 (IGRB) 的剩余全天辐射成分。IGRB 包含所有在给定巡天中太暗或太弥散而无法分辨的河外辐射，以及任何近似各向同性的剩余银河前景辐射。费米伽马射线空间望远镜 (Fermi) 搭载的大面积望远镜 (LAT) 进行的首次 IGRB 测量使用了 10 个月的巡天数据，考虑的能段范围为 200 MeV 至 100 GeV。事件选择的改进、宇宙射线背景特征的优化、对弥散银河辐射更好的理解，以及长达 50 个月的数据积累，使得利用 LAT 对 IGRB 的测量得以 refine 和扩展，现在的能段覆盖范围从 100 MeV 到 820 GeV。IGRB 能谱显示出显著的高能截断特征，在使用我们的基准弥散银河辐射模型时，可在近四个数量级的能量范围内用带有指数截断的幂律很好地描述，其谱指数为 ，截断能量为 GeV。归因于 IGRB 的总强度在 100 MeV 以上为 cm s sr，由于银河弥散前景的影响，还存在 %/% 的系统不确定性。
引用
@article{arxiv.1410.3696,
title = {The spectrum of isotropic diffuse gamma-ray emission between 100 MeV and 820 GeV},
author = {The Fermi LAT collaboration and M. Ackermann and M. Ajello and A. Albert and W. B. Atwood and L. Baldini and J. Ballet and G. Barbiellini and D. Bastieri and K. Bechtol and R. Bellazzini and E. Bissaldi and R. D. Blandford and E. D. Bloom and E. Bottacini and T. J. Brandt and J. Bregeon and P. Bruel and R. Buehler and S. Buson and G. A. Caliandro and R. A. Cameron and M. Caragiulo and P. A. Caraveo and E. Cavazzuti and C. Cecchi and E. Charles and A. Chekhtman and J. Chiang and G. Chiaro and S. Ciprini and R. Claus and J. Cohen-Tanugi and J. Conrad and A. Cuoco and S. Cutini and F. D'Ammando and A. de Angelis and F. de Palma and C. D. Dermer and S. W. Digel and E. do Couto e Silva and P. S. Drell and C. Favuzzi and E. C. Ferrara and W. B. Focke and A. Franckowiak and Y. Fukazawa and S. Funk and P. Fusco and F. Gargano and D. Gasparrini and S. Germani and N. Giglietto and P. Giommi and F. Giordano and M. Giroletti and G. Godfrey and G. A. Gomez-Vargas and I. A. Grenier and S. Guiriec and M. Gustafsson and D. Hadasch and K. Hayashi and E. Hays and J. W. Hewitt and P. Ippoliti and T. Jogler and G. Jóhannesson and A. S. Johnson and W. N. Johnson and T. Kamae and J. Kataoka and J. Knödlseder and M. Kuss and S. Larsson and L. Latronico and J. Li and L. Li and F. Longo and F. Loparco and B. Lott and M. N. Lovellette and P. Lubrano and G. M. Madejski and A. Manfreda and F. Massaro and M. Mayer and M. N. Mazziotta and J. E. McEnery and P. F. Michelson and W. Mitthumsiri and T. Mizuno and A. A. Moiseev and M. E. Monzani and A. Morselli and I. V. Moskalenko and S. Murgia and R. Nemmen and E. Nuss and T. Ohsugi and N. Omodei and E. Orlando and J. F. Ormes and D. Paneque and J. H. Panetta and J. S. Perkins and M. Pesce-Rollins and F. Piron and G. Pivato and T. A. Porter and S. Rainò and R. Rando and M. Razzano and S. Razzaque and A. Reimer and O. Reimer and T. Reposeur and S. Ritz and R. W. Romani and M. Sánchez-Conde and M. Schaal and A. Schulz and C. Sgrò and E. J. Siskind and G. Spandre and P. Spinelli and A. W. Strong and D. J. Suson and H. Takahashi and J. G. Thayer and J. B. Thayer and L. Tibaldo and M. Tinivella and D. F. Torres and G. Tosti and E. Troja and Y. Uchiyama and G. Vianello and M. Werner and B. L. Winer and K. S. Wood and M. Wood and G. Zaharijas and S. Zimmer},
journal= {arXiv preprint arXiv:1410.3696},
year = {2015}
}
备注
Accepted by The Astrophysical Journal