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arXiv 1508.04580astro-ph.HE
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用MAGIC望远镜系统探测来自最远和引力透镜blazar QSO B0218 +357的甚高能伽马射线

Detection of very-high-energy gamma rays from the most distant and gravitationally lensed blazar QSO B0218+357 using the MAGIC telescope system

Julian Sitarek, J. Becerra González, Dijana Dominis Prester, Elina Lindfors, Marina Manganaro, Daniel Mazin, Miguel Nievas Rosillo, Antonio Stamerra, Ievgen Vovk, Sara Buson

摘要:

类星体B 0218 +357是一颗耀变体,其宇宙学红移为z=0.944。它被一个红移z=0.68的螺旋星系引力透镜化。耀变体和它的透镜在射电到X射线波段中得到了很好的研究,费米-LAT探测到了几次能量超过100 MeV的耀变体爆发。强引力透镜被用来解释射电和GeV光变曲线中出现的相隔10-12天的两个分量。2014年7月,费米-LAT观测到另一次爆发,触发了MAGIC望远镜在100 GeV以上能量的后续观测。这些观测是在被透镜的强引力场延迟的分量的预期到达时间进行的,结果确实探测到了类星体B 0218 +357。使用相结合的费米-LAT和MAGIC数据集,我们报告的变化,这个独特的耀变体,最遥远的所有目前已知的非常高的能源。

英文摘要:

QSO B0218+357 is a blazar located at a cosmological redshift of z=0.944. It is gravitationally lensed by a spiral galaxy at a redshift of z=0.68. The blazar and its lens are well studied in the radio through X-ray bands, and several blazar outbursts were detected by Fermi-LAT at energies above 100 MeV. Strong gravitational lensing was invoked to explain the two components appar- ent in the radio and GeV light curves, separated by 10-12 days. In July 2014 another outburst was observed by Fermi-LAT, triggering follow-up observations with the MAGIC telescopes at energies above 100 GeV. The observations were scheduled at the expected time of arrival of the component delayed by the strong gravitational field of the lens, resulting in a firm detection of QSO B0218+357. Using the combined Fermi-LAT and MAGIC data sets, we report on variability of this unique blazar, the most distant among all currently known very high energy sources.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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