VLT/SINFONI study of black hole growth in high redshift radio-loud
  quasars from the CARLA survey
  We present VLT/SINFONI observations of 35 quasars at 2.1 < z < 3.2, the
majority of which were selected from the Clusters Around Radio-Loud AGN (CARLA)
survey. CARLA quasars have large CIV-based black hole (BH) masses (M(BH) > 10^9
Msun) and powerful radio emission (P(500MHz) > 27.5 W/Hz). We estimate Ha-based
M(BH), finding a scatter of 0.35 dex compared to CIV. We evaluate several
recipes for correcting CIV-based masses, which reduce the scatter to 0.24 dex.
The radio power of the radio-loud quasars is at most weakly correlated with the
interconnected quantities Ha-width, L(5100A) and M(BH), suggesting that it is
governed by different physical processes. However, we do find a strong inverse
correlation between CIV blueshift and radio power linked to higher Eddington
ratios and L(5100A). Under standard assumptions, the BH growth time is longer
than the cosmic age for many CARLA quasars, suggesting that they must have
experienced more efficient growth in the past. If these BHs were growing from
seeds since the epoch of reionization, it is possible that they grew at the
Eddington limit like the quasars at z ~ 6-7, and then continued to grow at the
reduced rates observed until z ~ 2-3. Finally, we study the relation between
M(BH) and environment, finding a weak positive correlation between M(BH) and
galaxy density measured by CARLA.
