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Open AccessArticle

Flaring γ-Ray Emission from High Redshift Blazars

1
INAF - Istituto di Radioastronomia, Via Gobetti 101, Bologna I-40129, Italy
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Dipartimento di Fisica e Astronomia, Universitá degli Studi di Bologna, Viale Berti Pichat, 6/2, Bologna I-40127, Italy
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U.S. Naval Research Laboratory, Code 7653, 4555 Overlook Ave SW, Washington, DC 20375-5352, USA
*
Author to whom correspondence should be addressed.
Academic Editors: Jose L. Gómez, Alan P. Marscher and Svetlana G. Jorstad
Galaxies 2016, 4(3), 26; https://doi.org/10.3390/galaxies4030026
Received: 14 July 2016 / Revised: 16 August 2016 / Accepted: 16 August 2016 / Published: 6 September 2016
(This article belongs to the Special Issue Blazars through Sharp Multi-wavelength Eyes)
High redshift blazars are among the most powerful objects in the Universe. Although they represent a significant fraction of the extragalactic hard X-ray sky, they are not commonly detected in γ-rays. High redshift ( z > 2 ) objects represent < 10 per cent of the active galactic nuclei (AGN) population observed by Fermi so far, and γ-ray flaring activity from these sources is even more uncommon. The characterization of the radio-to-γ-ray properties of high redshift blazars represents a powerful tool for the study of the energetics of such extreme objects and the Extragalactic Background Light. This contribution will present results of multi-band campaigns, from radio to γ-rays, on PKS 0836+710, PKS 2149−306, and TXS 0536+145. The latter is the highest redshift detection of a flaring γ-ray blazar so far. At the peaks of their respective flares these sources reached an apparent isotropic gamma-ray luminosity of about 10 50 erg·s 1 , which is comparable with the luminosity observed from the most powerful blazars. The physical properties derived from the multi-wavelength observations of these sources are then compared with those shown by the high redshift population. View Full-Text
Keywords: galaxies: active; gamma-rays: general; radiation mechanisms: non-thermal galaxies: active; gamma-rays: general; radiation mechanisms: non-thermal
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Orienti, M.; D’Ammando, F.; Giroletti, M.; Finke, J.; Dallacasa, D. Flaring γ-Ray Emission from High Redshift Blazars. Galaxies 2016, 4, 26.

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