SIMBAD references

2014AJ....147....6M - Astron. J., 147, 6 (2014/January-0)

The highest redshift quasar at z = 7.085: a radio-quiet source.


Abstract (from CDS):

We present 1-2 GHz Very Large Array A-configuration continuum observations on the highest redshift quasar known to date, the z = 7.085 quasar ULAS J112001.48+064124.3. The results show no radio continuum emission at the optical position of the quasar or its vicinity at a level of ≥ 3σ or 23.1 µJy/beam. This 3σ limit corresponds to a rest-frame 1.4 GHz luminosity density limit of L_ν, 1.4 GHz_< 1.76x1024 W/Hz for a spectral index of α = 0, and L_ν, 1.4 GHz_< 1.42x1025 W/Hz for a spectral index of α = -1. The rest-frame 1.4 GHz luminosity limits are Lrad< 6.43x106 L and Lrad< 5.20x107 Lfor α = 0 and α = -1, respectively. The derived limits for the ratio of the rest-frame 1.4 GHz luminosity density to the B-band optical luminosity density are R1.4* < 0.53 and <4.30 for the above noted spectral indices, respectively. Given our upper limits on the radio continuum emission and the radio-to-optical luminosity ratio, we conclude that this quasar is radio-quiet and located at the low end of the radio-quiet distribution of high-redshift (z ≳ 6) quasars.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: high-redshift - galaxies: individual: ULAS J112001.48+064124.3 - radio continuum: galaxies - techniques: interferometric

Simbad objects: 3

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