Flux-density measurements of the high-redshift blazar PSO J047.4478+27.2992 at 4.7 and 8.2 GHz with RATAN-600

Abstract

We report the first detection at 4.7 and 8.2 GHz with the RATAN-600 radio telescope of the source PSO J047.4478+27.2992, which has been announced as a blazar at z=6.1. The average flux density is $12\pm 3$ and $8\pm 4$ mJy at 4.7 and 8.2 GHz respectively, and an upper limit is estimated as 3 mJy at 11.2 GHz. The light curve at 4.7 GHz, obtained on a time-scale of four months, exhibits moderate variability of the source (fractional variability $F_{var}=0.28\pm 0.02$). The new RATAN-600 measurements extend previous literature data to higher frequencies, indicating a single power-law radio spectrum with ${\alpha }_{0.147-8.2}$=$-0.51\pm 0.1$. The monochromatic radio luminosity at 4.7 GHz $P_{\nu }\sim 2\times 10^{27}$ W Hz${}^{-1}$ is consistent with values for high-redshift quasars at $z\ge 3$.

6 pages, 5 figures, accepted for publication in Monthly Notices of the Royal Astronomical Society

References in corpus (15)

• Cosmic Star Formation History
• CRATES: An All-Sky Survey of Flat-Spectrum Radio Sources
• The Radio-Loud Fraction of Quasars is a Strong Function of Redshift and Optical Luminosity
• Prevalence of radio jets associated with galactic outflows and feedback from quasars
• Constraining the radio-loud fraction of quasars at z>5.5
• The first blazar observed at z>6
• Millimeter and Radio Observations of z~6 Quasars
• The first estimate of radio jet proper motion at z>5
• On the nature of bright compact radio sources at z>4.5
• SRG/eROSITA uncovers the most X-ray luminous quasar at z>6
• Evolving parsec-scale radio structure in the most distant blazar known
• Parsec-scale properties of the radio brightest jetted AGN at z > 6
• The space density of z>4 blazars
• Multifrequency study of GHz-peaked spectrum sources
• Simultaneous spectra and radio properties of BL Lac's

Cited by in corpus (7)

• High-redshift quasars at $z\ge 3$ -- I. Radio spectra
• Direct observation of an extended X-ray jet at $z$=6.1
• A blazar in the epoch of reionization
• 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
• Multifrequency study of gigahertz-peaked spectrum sources with RATAN-600
• Radio properties of high-redshift galaxies at $z\ge 1$