Black hole mass estimates and emission-line properties of a sample of redshift z>6.5 quasars

Understand

We present the analysis of optical and near-infrared spectra of the only four $z>6.5$ quasars known to date, discovered in the UKIDSS-LAS and VISTA-VIKING surveys.

• Our data-set consists of new VLT/X-Shooter and Magellan/FIRE observations.
• These are the best optical/NIR spectroscopic data that are likely to be obtained for the $z>6.5$ sample using current $6$ - $10$ m facilities.
• We estimate the black hole mass, the Eddington ratio, and the SiIV/CIV, CIII]/CIV, and FeII/MgII emission-line flux ratios.