SDSS J114657.79+403708.6: the third most distant blazar at z=5.0

Abstract

The radio-loud quasar SDSS J114657.79+403708.6 at a redshift z=5.0 is one of the most distant radio-loud objects. The IR-optical luminosity and spectrum suggest that its black hole has a very large mass: M=(5+-1)x 1e9 Msun. The radio-loudness (ratio of the radio to optical flux) of the source is large (around 100), suggesting that the source is viewed at small angles from the jet axis, and could be a blazar. The X-ray observations fully confirm this hypothesis, due to the high level and hardness of the flux. This makes SDSS J114657.79+403708.6 the third most distant blazar known, after Q0906+693 (z=5.47) and B2 1023+25 (z=5.3). Among those, SDSS J114657.79+403708.6 has the largest black hole mass, setting interesting constraints on the mass function of heavy (larger than one billion solar masses) black holes at high redshifts.

5 pages, 3 figures, accepted for publication as a letter in MNRAS. arXiv admin note: text overlap with arXiv:1208.3467

References in corpus (5)

• A Catalog of Quasar Properties from SDSS DR7
• The Optical-Radio Mapping: the kinetic efficiency of Radio-Loud AGNs
• Jet enhanced accretion growth of supermassive black holes
• The Spectral Energy Distribution of the High-Z Blazar Q0906+693
• High-resolution images of five radio quasars at early cosmological epochs

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