文章基本信息

标题：Formation of Hard VHE Spectra of Blazars in Leptonic Models
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作者：E. Lefa
期刊名称：PoS - Proceedings of Science
印刷版ISSN：1824-8039
出版年度：2011
卷号：2011
期号：AGN2011
出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：In this contribution we discuss the problem of the hard-spectrum VHE sources and their possible interpretation within leptonic models. Blazars can be strong TeV emitters and these TeV photons can interact with the infrared photons of the extragalactic background light (EBL) via the process gg → e+e−, as they travel over cosmological distances to the observer. This mechanism results in a modification of the observed flux with respect to the intrinsic one in the sense that the observed spectrum appears softer than it is intrinsically. The problem is that in some cases the unabsorbed, EBL-corrected spectrum seems very hard, even when only corrected for low EBL flux levels.