THE HIGHEST REDSHIFT QUASAR AT z=7.085: A RADIO-QUIET SOURCE

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 >= 3 sigma or 23.1 mu Jy beam(-1). This 3 sigma limit corresponds to a rest-frame 1.4 GHz luminosity density limit of L-v,L-1.4 GHz < 1.76 x10(24) WHz(-1) for a spectral index of alpha = 0, and L-v,L- 1.4 GHz < 1.42x10(25) WHz(-1) for a spectral index of alpha = -1. The rest-frame 1.4 GHz luminosity limits are L-rad < 6.43 x 10(6) L-circle dot and L-rad < 5.20 x 10(7) L-circle dot for alpha = 0 and a = -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 R* (1.4) < 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.