Intergalactic absorption and blazar γ-ray spectra
نویسندگان
چکیده
منابع مشابه
Intergalactic absorption and blazar γ-ray spectra
The distribution of TeV spectral slopes versus redshift for currently known TeV blazars (15 sources with z≤0.21, and one with z>0.25) is essentially a scatter plot with hardly any hint of a global trend. We suggest that this is the outcome of two combined effects of intergalactic γγ absorption, plus an inherent feature of the SSC (synchro-self-Compton) process of blazar emission. First, flux di...
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We derive a new and user friendly simple analytic approximation for determining the effect of intergalactic absorption on the γ-ray spectra of TeV blazars the energy range 0.2 TeV < Eγ < 2 TeV and the redshift range 0.05 < z < 0.4. In these ranges, the form of the absorption coefficient τ(Eγ) is approximately logarithmic. The effect of this energy dependence is to steepen intrinsic source spect...
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Blazars exhibit flares across the entire electromagnetic spectrum. Many γ-ray flares are highly correlated with flares detected at longer wavelengths; however, a small subset appears to occur in isolation, with little or no correlated variability at longer wavelengths. These “orphan” γ-ray flares challenge current models of blazar variability, most of which are unable to reproduce this type of ...
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In this paper, I will take a synoptic approach to determining the in-tergalactic infrared radiation field (IIRF). This approach draws on both the multi-TeV γ-ray observations and the infrared background observations and relates them via the semi-empirical modelling method of Malkan & Stecker. I discuss the evidence for an intergalactic infrared background obtained by an analysis of the HEGRA ob...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2008
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20079074