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|Title:||SDSS J013127.34-032100.1: a candidate blazar with an 11 billion solar mass black hole at z = 5.18||Authors:||GHISELLINI, Gabriele
|Issue Date:||2015||Journal:||MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY||Number:||450||First Page:||L34||Abstract:||The radio-loud quasar SDSS J013127.34-032100.1 at a redshift z = 5.18 is one of the most distant radio-loud objects. The radio to optical flux ratio (i.e. the radio-loudness) of the source is large, making it a promising blazar candidate. Its overall spectral energy distribution, completed by the X-ray flux and spectral slope derived through Target of Opportunity Swift/X-ray Telescope observations, is interpreted by a non-thermal jet plus an accretion disc and molecular torus model. We estimate that its black hole mass is (1.1 ± 0.2) for an accretion efficiency η = 0.08, scaling roughly linearly with η. Although there is a factor ≳2 of systematic uncertainty, this black hole mass is the largest found at these redshifts. We derive a viewing angle between 3 and 5 deg. This implies that there must be other (hundreds) sources with the same black hole mass of SDSS J013127.34-032100.1, but whose jets are pointing away from Earth. We discuss the problems posed by the existence of such large black hole masses at such redshifts, especially in jetted quasars. In fact, if they are associated with rapidly spinning black holes, the accretion efficiency is high, implying a slower pace of black hole growth with respect to radio-quiet quasars.||Acknowledgments:||This publication makes use of data products from the Wide-field Infrared Survey Explorer , which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/Caltech, funded by NASA. It also makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/Caltech, funded by NASA and the National Science Foundation. Part of this work is based on archival data and online service provided by the ASI Science Data Center (ASDC).||URI:||http://hdl.handle.net/20.500.12386/23970||URL:||https://academic.oup.com/mnrasl/article/450/1/L34/985935||ISSN:||0035-8711||DOI:||10.1093/mnrasl/slv042||Bibcode ADS:||2015MNRAS.450L..34G||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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