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

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.

5 pages, 3 figures. Accepted for publication in MNRAS

References in corpus (4)

• A Catalog of Quasar Properties from SDSS DR7
• CRATES: An All-Sky Survey of Flat-Spectrum Radio Sources
• GROND - a 7-channel imager
• The Spectral Energy Distribution of the High-Z Blazar Q0906+693

Cited by in corpus (37)

• Black hole mass estimate for a sample of radio-loud narrow-line Seyfert 1 galaxies
• The first blazar observed at z>6
• Blazar candidates beyond redshift 4 observed by Swift
• The role of relativistic jets in the heaviest and most active supermassive black holes at high redshift
• The first estimate of radio jet proper motion at z>5
• Radio-loud AGNs at high redshifts and the cosmic microwave background
• X-ray properties of z>4 blazars
• SDSS J114657.79+403708.6: the third most distant blazar at z=5.0
• Blazar candidates beyond redshift 4 observed with GROND
• SDSS J013127.34-032100.1: a candidate blazar with a 11 billion solar mass black hole at $z$=5.18
• High-redshift quasars at $z\ge 3$ -- I. Radio spectra
• NuSTAR and multifrequency study of the two high-redshift blazars S5 0836+710 and PKS 2149-306
• J0906+6930: a radio-loud quasar in the early Universe
• Dark bubbles around high-redshift radio-loud AGN
• Fast $\gamma$-ray variability in blazars beyond redsift 3
• NuSTAR, Swift, and GROND observations of the flaring MeV blazar: PMN J0641$-$0320
• Blazar nature of high-z radio-loud quasars
• An extremely X--ray weak blazar at z=5
• $Fermi$-LAT detection of a transient $\gamma$-ray source in the direction of a distant blazar B3 1428+422 at $z=4.72$
• Multi-wavelength variability of CGRaBS J0733+0456: identifying a distant $\gamma$-ray blazar at z = 3.01
• High redshift Fermi blazars observed by GROND and Swift
• The central engine of the highest redshift blazar
• On the Doppler boosting in the compact radio jet of the distant blazar J1026+2542 at z=5.3
• Observations by GMRT at 323 MHz of radio-loud quasars at $z>5$
• What do observations tell us about the highest-redshift supermassive black holes?
• Flux-density measurements of the high-redshift blazar PSO J047.4478+27.2992 at 4.7 and 8.2 GHz with RATAN-600
• A powerful (and likely young) radio-loud quasar at z=5.3
• High-redshift quasars at $z\ge 3$: radio variability and MPS/GPS candidates
• Multi-wavelength properties of three new radio-powerful $z\sim 5.6$ quasi-stellar objects discovered from RACS
• High-$z$ radio Quasars in RACS I: Selection, identification, and multi-wavelength properties
• Is the X-ray bright z = 5.5 quasar SRGE J170245.3+130104 a blazar?
• Revealing faint compact radio jets at redshifts above 5 with very long baseline interferometry
• Detections of simultaneous brightening of gamma-ray and optical emissions of a distant blazar GB 1508+5714 at redshift 4.3
• Is BZB J1450+5201 the most distant $\gamma$-ray BL Lacertae object?
• VLBI observations of the high-redshift X-ray bright blazar SRGE J170245.3+130104
• NVSS J151002+570243: accretion and spin of a z > 4 Fermi detected blazar
• The Impact of Powerful Jets on the Far-infrared Emission of an Extreme Radio Quasar at z~6