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SDSS J102623.61+254259.5: the second most distant blazar at z=5.3

By T. Sbarrato, G. Ghisellini, M. Nardini, G. Tagliaferri, L. Foschini, G. Ghirlanda, F. Tavecchio, J. Greiner, A. Rau and N. Gehrels

Abstract

The radio-loud quasar SDSS J102623.61+254259.5, at a redshift z=5.3, is one of the most distant radio-loud objects. Since its radio flux exceeds 100 mJy at a few GHz, it is also one of the most powerful radio-loud sources. We propose that this source is a blazar, i.e. we are seeing its jet at a small viewing angle. This claim is based on the spectral energy distribution of this source, and especially on its strong and hard X-ray spectrum, as seen by Swift, very typical of powerful blazars. Observations by the Gamma-Ray Burst Optical/Near-Infrared Detector (GROND) and by theWide-field Infrared Survey Explorer (WISE) allow to establish the thermal nature of the emission in the near IR-optical band. Assuming that this is produced by a standard accretion disk, we derive that it emits a luminosity of L_d \simeq 9 \times 10^46 erg s^{-1} and that the black hole has a mass between 2 and 5 billion solar masses. This poses interesting constraints on the mass function of heavy (> 10^9 M_sun) black holes at high redshifts.Comment: 5 pages, 3 figures. Accepted for publication in MNRA

Topics: Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - High Energy Astrophysical Phenomena
Year: 2012
DOI identifier: 10.1111/j.1745-3933.2012.01332.x
OAI identifier: oai:arXiv.org:1208.3467

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