Properties of Very Broad Line MgII Radio-Loud and Radio-Quiet Quasars

TL;DR

This study compares properties of very broad line MgII quasars, revealing that radio-loud quasars tend to have higher luminosities and black hole masses than radio-quiet ones, with no dust distribution differences.

Contribution

It provides the first detailed comparison of RL and RQ quasars with very broad MgII lines, highlighting differences in luminosity and black hole mass.

Findings

RL quasars have a 40% radio loud fraction in the VBL sample.

RL quasars exhibit higher luminosities and black hole masses than RQ quasars.

No difference in dust covering fraction between RL and RQ quasars.

Abstract

We perform an analysis of the properties of radio-loud (RL) and radio-quiet (RQ) quasars with MgII broad emission line (i-band magnitude $\leq 19.1$ and z $\leq 1.9$), selected from the parent sample of SDSS DR7 catalogue. For sources with full-width half maxima (FWHM) greater than \mbox{15,000 km s$^{-1}$} (very broad line sample; VBL) we find the radio loud fraction (RLF) to be about 40\%. To further investigate this result we compare the bolometric luminosity, optical continuum luminosity, black hole (BH) mass and Eddington ratios of our VBL sample of RL and RQ quasars. Our analysis shows that in our VBL sample space, RL quasars have higher luminosities and BH mass than RQ quasars. The similarity in the distribution of their covering fraction (CF) shows that there is no difference in dust distribution between VBL RL and RQ quasars and hence dust is not affecting our results. We also find that there is no correlation of RL quasar properties with optical continuum luminosity and BH mass.