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Title: | Flaring γ-Ray Emission from High Redshift Blazars | Authors: | ORIENTI, Monica D'AMMANDO, FILIPPO GIROLETTI, MARCELLO Finke, Justin Dallacasa, Daniele |
Issue Date: | 2016 | Journal: | GALAXIES | Number: | 4 | Issue: | 3 | First Page: | 26 | 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 ( <mml:math display="inline"> <mml:mrow> <mml:mi>z</mml:mi> <mml:mo>></mml:mo> <mml:mn>2</mml:mn> </mml:mrow> </mml:math>) objects represent <mml:math display="inline"> <mml:mrow> <mml:mo><</mml:mo> <mml:mn>10</mml:mn> </mml:mrow> </mml:math> 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 <mml:math display="inline"> <mml:msup> <mml:mrow></mml:mrow> <mml:mn>50</mml:mn> </mml:msup> </mml:math> erg·s <mml:math display="inline"> <mml:msup> <mml:mrow></mml:mrow> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> </mml:math>, 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. | URI: | http://hdl.handle.net/20.500.12386/26012 | URL: | https://www.mdpi.com/2075-4434/4/3/26 | ISSN: | 2075-4434 | DOI: | 10.3390/galaxies4030026 | Bibcode ADS: | 2016Galax...4...26O | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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galaxies-04-00026.pdf | Pdf editoriale | 732.17 kB | Adobe PDF | View/Open |
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