Degree-scale GeV ’jets’ from active and dead TeV blazarsстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:We show that images of TeV blazars in the GeV energy band should contain, along with point-like
sources, degree-scale jet-like extensions. These GeV extensions are the result of electromagnetic cas-
cades initiated by TeV γ-rays interacting with extragalactic background light and the deflection of the
cascade electrons/positrons in extragalactic magnetic fields (EGMF). Using Monte-Carlo simulations,
we study the spectral and timing properties of the degree-scale extensions in simulated GeV band
images of TeV blazars. We show that the brightness profile of such degree-scale extensions can be
used to infer the lightcurve of the primary TeV γ-ray source over the past 107 yr, i.e. over a time scale
comparable to the life-time of the parent active galactic nucleus. This implies that the degree-scale
jet-like GeV emission could be detected not only near known active TeV blazars, but also from “TeV
blazar remnants”, whose central engines were switched off up to ten million years ago. Since the
brightness profile of the GeV “jets” depends on the strength and the structure of the EGMF, their
observation provides additionally information about the EGMF.