Flaring γ-Ray Emission from High Redshift Blazars
INAF - Istituto di Radioastronomia, Via Gobetti 101, Bologna I-40129, Italy
Dipartimento di Fisica e Astronomia, Universitá degli Studi di Bologna, Viale Berti Pichat, 6/2, Bologna I-40127, Italy
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
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 (
) objects represent
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
, 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.
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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.
Orienti M, D’Ammando F, Giroletti M, Finke J, Dallacasa D. Flaring γ-Ray Emission from High Redshift Blazars. Galaxies. 2016; 4(3):26.
Orienti, Monica; D’Ammando, Filippo; Giroletti, Marcello; Finke, Justin; Dallacasa, Daniele. 2016. "Flaring γ-Ray Emission from High Redshift Blazars." Galaxies 4, no. 3: 26.
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