An excess of extreme TeV blazars from the Fermi LAT distribution on the voidiness parameter
August 16, 2017
August 03, 2018
Recently it was found that Fermi LAT blazars with relatively hard ($\gamma<$3) observed spectra above 10 GeV are predominantly located towards the directions to voids in the large scale structure and, moreover, the observed flux of $E>$10 GeV $\gamma$-rays is usually greater for the case of such directions. This effect may be interpreted in the framework of the "electromagnetic cascade model" (T.A. Dzhatdoev et al., A&A, 603, A59 (2017)). Namely, the secondary (cascade) component significantly enhances the observable flux in the 10-500 GeV energy region, rendering the sources brighter in this energy range. The model predicts the existence of a new population of blazars with very hard spectra in the 10 GeV-1 TeV energy region that could be discovered in future by the CTA observatory.
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