On the Extend of Eddington Ratio and Accretion Rate in Seyfert 1 and Hidden Broad Line Region Seyfert 2 Galaxies

Abstract

We present our result on the Eddington ratios and accretion rates of 13,516 Seyfert galaxies consisting of 6,758 Seyfert 1s and 6,758 Seyfert 2s. These objects under study are a sub-sample of 91,006 Seyfert galaxies from SDSS-DR14. Using the separation criterion > 3 for Seyfert 2 galaxies, the 91,006 objects are separated into Seyferts 1s and 2s and we further select Hidden broadline region (HBLR) Seyfert 2s. Our results show that Seyfert 1 galaxies have higher Eddington ratio that Seyfert 2s an indication that Seyfert 1 galaxies may be more AGN-dominated than Seyfert 2 galaxies. We find the mean luminosity of the doubly ionized oxygen line () to be higher in Seyfert 2 galaxies a pointer that narrow line regions (NLRs) in Seyfert 2s may contain higher density of cloud of particles than Seyfert 1s. In addition, () is found to increase with increasing Eddington ratio which shows that the NLR is likely to be illuminated by the central region; a precursor that the central region and the NRL should be few parsecs apart. The observation we make that Seyferts 1 and 2 of equal black hole mass (=) have diametrically unequal Eddington ratio of log=8.9638 for Seyfert 2s and log=5.801 for Seyfert 1s suggests that each of the Seyfert classes may have been associated with different AGN activities. On accretion rate, Seyfert 2 galaxies have higher accretion rate which implies that they are probably in the gravitational force era dominated by absorption by matter while Seyfert 1s are probably in the radiation force dominated era and as such not associated with absorption by matter.