VLA observation of 50 z~1.65 quasars

Given (1) the nonlinear correlation between UV and X-ray luminosity in quasars, (2) that such a correlation leads to higher likelihood of radiation-line-driven winds in more luminous quasars, and (3) that luminous quasars are more abundant at high redshift, deep radio observations of high-redshift quasars are needed to probe potential contributions from accretion disk winds.

We target a sample of 50 z~1.65 color-selected quasars that span the range of expected accretion disk wind properties as traced by broad CIV emission. 3GHz observations with the Very Large Array to an rms of ~10{mu}Jy/beam probe to star formation rates of ~400M{sun}/yr, leading to 22 detections. Supplementing these pointed observations are survey data of 388 sources from the LOFAR Two-meter Sky Survey Data Release 1 that reach comparable depth (for a typical radio spectral index), where 123 sources are detected.