Covering factors of the dusty obscurers in radio-loud and radio-quiet
  quasars
  We compare covering factors of circumnuclear dusty obscurers in radio-loud
and radio-quiet quasars. The radio-loud quasars are represented by a sample of
FR II quasars obtained by cross-matching a catalog of the FR II radio sources
selected by van Velzen et al. with the SDSS DR7 catalog of quasars. Covering
factors of FR II quasars are compared with covering factors of the radio-quiet
quasars matched with them in redshift, black hole mass, and Eddington-ratio. We
found that covering factors, proxied by the infrared-to-bolometric luminosity
ratio, are on average slightly smaller in FR II quasars than in radio-quiet
quasars, however, this difference is statistically significant only for the
highest Eddington ratios. For both samples, no statistically significant
dependence of a median covering factor on Eddington ratio, black hole mass, nor
redshift can be claimed.
