Blazar halos as probe for extragalactic magnetic fields and maximal acceleration energyстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:High energy photons from blazars interact within tens of kpc with the extragalactic photon
background, initiating electromagnetic pair cascades. The charged component of such cascades is
deflected by extragalactic magnetic fields (EGMF), leading to halos even around initially point-
like sources. We calculate the intensity profile of the resulting secondary high-energy photons for
different assumptions on the initial source spectrum and the strength of the EGMF, employing also
fields found earlier in a constrained simulation of structure formation including MHD processes. We
find that the observation of halos around blazars like Mrk 180 probes an interesting range of EGMF
strengths and acceleration models: In particular, blazar halos test if the photon energy spectrum at
the source extends beyond ∼ 100 TeV and how anisotropic this high energy component is emitted.