Optical spectroscopy of Fermi blazars

This includes broad emission-line systems and blazars whose optical spectra lack emission lines but are dominated by the absorption features arising from the host galaxy. The average MBH for the sample is <logM_BH,allM_{sun}_>=8.60, and there is evidence suggesting the association of more massive black holes with absorption-line systems.

Our results indicate a bimodality of L_disk_ in Eddington units (L_disk_/L_Edd_) with broad-line objects tend to have a higher accretion rate (L_disk_/L_Edd_>0.01). We have found that L_disk_/L_Edd_ and Compton dominance (CD; the ratio of the inverse Compton to synchrotron peak luminosities) are positively correlated at the >5{sigma} confidence level, suggesting that the latter can be used to reveal the state of accretion in blazars.