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arXiv 1512.04434astro-ph.HEastro-ph.CO
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类星体PKS 1441+25的伽马射线：一次逃逸的故事

Gamma rays from the quasar PKS 1441+25: story of an escape

A. U. Abeysekara, S. Archambault, A. Archer, T. Aune, A. Barnacka, W. Benbow, R. Bird, J. Biteau, J. H. Buckley, V. Bugaev, J. V Cardenzana, M. Cerruti, X. Chen… 展开作者

A. U. Abeysekara, S. Archambault, A. Archer, T. Aune, A. Barnacka, W. Benbow, R. Bird, J. Biteau, J. H. Buckley, V. Bugaev, J. V Cardenzana, M. Cerruti, X. Chen, J. L. Christiansen, L. Ciupik, M. P. Connolly, P. Coppi, W. Cui, H. J. Dickinson, J. Dumm, J. D. Eisch, M. Errando, A. Falcone, Q. Feng, J. P. Finley, H. Fleischhack, A. Flinders, P. Fortin, L. Fortson, A. Furniss, G. H. Gillanders, S. Griffin, J. Grube, G. Gyuk, M. Hütten, N. Håkansson, D. Hanna, J. Holder, T. B. Humensky, C. A. Johnson, P. Kaaret, P. Kar, N. Kelley-Hoskins, Y. Khassen, D. Kieda, M. Krause, F. Krennrich, S. Kumar, M. J. Lang, G. Maier, S. McArthur, A. McCann, K. Meagher, P. Moriarty, R. Mukherjee, D. Nieto, A. O'Faoláin de Bhróithe, R. A. Ong, A. N. Otte, N. Park, J. S. Perkins, A. Petrashyk, M. Pohl, A. Popkow, E. Pueschel, J. Quinn, K. Ragan, G. Ratliff, P. T. Reynolds, G. T. Richards, E. Roache, J. Rousselle, M. Santander, G. H. Sembroski, K. Shahinyan, A. W. Smith, D. Staszak, I. Telezhinsky, N. W. Todd, J. V. Tucci, J. Tyler, V. V. Vassiliev, S. Vincent, S. P. Wakely, O. M. Weiner, A. Weinstein, A. Wilhelm, D. A. Williams, B. Zitzer, P. S. Smith, T. W. -S. Holoien, J. L. Prieto, C. S. Kochanek, K. Z. Stanek, B. Shappee, T. Hovatta, W. Max-Moerbeck, T. J. Pearson, R. A. Reeves, J. L. Richards, A. C. S. Readhead, G. M. Madejski, S. G. Djorgovski, A. J. Drake, M. J. Graham, A. Mahabal

备注：
7 pages, 3 figures, published in ApJ Letters 815, L22 (2015)
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摘要：

伽马射线类星体的爆发提供了对活动星系核的相对论喷流和对充满宇宙的漫射辐射场的约束的见解。从遥远的类星体探测到超过100 GeV的显著辐射将表明，一些辐射的伽马射线逃脱了与低能光子的成对产生相互作用，无论是河外背景光（EBL），还是位于喷流底部的超大质量黑洞附近的辐射。VERITAS在2015年4月期间从PKS 1441+25（z=0.939）探测到高达200 GeV的伽马射线发射，这是所有波长的高活动期。对PKS 1441+25的观测表明，发射区位于距离黑洞数千史瓦西半径的地方。伽马射线探测还对近紫外到近红外EBL强度设定了严格的上限，这表明星系巡天已经解决了这些波长的大多数（如果不是全部的话）EBL源。

英文摘要：

Outbursts from gamma-ray quasars provide insights on the relativistic jets of active galactic nuclei and constraints on the diffuse radiation fields that fill the Universe. The detection of significant emission above 100 GeV from a distant quasar would show that some of the radiated gamma rays escape pair-production interactions with low-energy photons, be it the extragalactic background light (EBL), or the radiation near the supermassive black hole lying at the jet's base. VERITAS detected gamma-ray emission up to 200 GeV from PKS 1441+25 (z=0.939) during April 2015, a period of high activity across all wavelengths. This observation of PKS 1441+25 suggests that the emission region is located thousands of Schwarzschild radii away from the black hole. The gamma-ray detection also sets a stringent upper limit on the near-ultraviolet to near-infrared EBL intensity, suggesting that galaxy surveys have resolved most, if not all, of the sources of the EBL at these wavelengths.

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