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Galaxies 2016, 4(3), 26; doi:10.3390/galaxies4030026

Flaring γ-Ray Emission from High Redshift Blazars

1
INAF - Istituto di Radioastronomia, Via Gobetti 101, Bologna I-40129, Italy
2
Dipartimento di Fisica e Astronomia, Universitá degli Studi di Bologna, Viale Berti Pichat, 6/2, Bologna I-40127, Italy
3
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
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)
View Full-Text   |   Download PDF [732 KB, uploaded 6 September 2016]   |  

Abstract

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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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

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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