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arXiv 1701.01067astro-ph.HE
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耀变体B2 1215+30的发光和孤立的gamma-ray耀斑

A luminous and isolated gamma-ray flare from the blazar B2 1215+30

VERITAS Collaboration, A. U. Abeysekara, S. Archambault, A. Archer, W. Benbow, R. Bird, M. Buchovecky, J. H. Buckley, V. Bugaev, K. Byrum, M. Cerruti, X. Chen, … 展开作者

VERITAS Collaboration, A. U. Abeysekara, S. Archambault, A. Archer, W. Benbow, R. Bird, M. Buchovecky, J. H. Buckley, V. Bugaev, K. Byrum, M. Cerruti, X. Chen, L. Ciupik, W. Cui, H. J. Dickinson, J. D. Eisch, M. Errando, A. Falcone, Q. Feng, J. P. Finley, H. Fleischhack, L. Fortson, A. Furniss, G. H. Gillanders, S. Griffin, J. Grube, M. Hutten, N. Hakansson, D. Hanna, J. Holder, T. B. Humensky, C. A. Johnson, P. Kaaret, P. Kar, M. Kertzman, D. Kieda, M. Krause, F. Krennrich, S. Kumar, M. J. Lang, G. Maier, S. McArthur, A. McCann, K. Meagher, P. Moriarty, R. Mukherjee, T. Nguyen, D. Nieto, R. A. Ong, A. N. Otte, N. Park, V. Pelassa, M. Pohl, A. Popkow, E. Pueschel, J. Quinn, K. Ragan, P. T. Reynolds, G. T. Richards, E. Roache, C. Rulten, M. Santander, G. H. Sembroski, K. Shahinyan, D. Staszak, I. Telezhinsky, J. V. Tucci, J. Tyler, S. P. Wakely, O. M. Weiner, A. Weinstein, A. Wilhelm, D. A. Williams, Fermi-LAT Collaboration, :, S. Fegan, B. Giebels, D. Horan, A. Berdyugin, J. Kuan, E. Lindfors, K. Nilsson, A. Oksanen, H. Prokoph, R. Reinthal, L. Takalo, F. Zefi

摘要:

B2 1215+30是一个BL Lac型耀变体,它首先由MAGIC大气切伦科夫望远镜在TeV能量下探测到,随后由VERITAS天文台在2009年至2012年期间收集的数据证实。2014年2月8日,VERITAS在对位于同一视场的blazar 1 ES 1218+304进行常规监测观测期间,从B2 1215+30探测到了一次大振幅耀斑。TeV通量达到蟹状星云通量的2.4倍,变化时间尺度< 3.6小时。费米-LAT、斯威夫特和图奥拉天文台的多波长观测揭示了一个相关的高GeV通量状态,并且与耀斑没有显著的光学对应物,其光谱能量分布是伽马射线光度超过同步加速器光度。当在单区轻子模型的框架下解释时,观测到的发射意味着高度的聚束,多普勒因子> 10,以及光谱指数< 2.3的电子布居。

英文摘要:

B2 1215+30 is a BL Lac-type blazar that was first detected at TeV energies by the MAGIC atmospheric Cherenkov telescopes, and subsequently confirmed by the VERITAS observatory with data collected between 2009 and 2012. In 2014 February 08, VERITAS detected a large-amplitude flare from B2 1215+30 during routine monitoring observations of the blazar 1ES 1218+304, located in the same field of view. The TeV flux reached 2.4 times the Crab Nebula flux with a variability timescale of < 3.6 h. Multiwavelength observations with Fermi-LAT, Swift, and the Tuorla observatory revealed a correlated high GeV flux state and no significant optical counterpart to the flare, with a spectral energy distribution where the gamma-ray luminosity exceeds the synchrotron luminosity. When interpreted in the framework of a one-zone leptonic model, the observed emission implies a high degree of beaming, with Doppler factor > 10, and an electron population with spectral index < 2.3.

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