| |
 |
| Paper: |
The Black Hole–Bulge Relations in Active Galaxies |
| Volume: |
373, The Central Engine of Active Galactic Nuclei |
| Page: |
70 |
| Authors: |
Wandel, A. |
| Abstract: |
Massive black holes detected in the centers of nearby galaxies show a strong correlation with the luminosity of the bulge of the host galaxy. The mass of the BH appears to be a fixed fraction (0.001–0.003) of the bulge’s mass. Our previous work has demonstrated that the BH-bulge relation in Seyfert galaxies and nearby quasars have the same black hole-bulge relation as ordinary (inactive) galaxies. We focus on AGNs for which the BH mass has been estimated using the reverberation mapping (light echo) method. Using improved reverberation- based BH mass estimates in AGN, we confirm our previous result, that BHs in AGN have the same relation as inactive galaxies. However, a subgroup, narrow- line Seyfert galaxies (NLS1s) and narrow-line quasars, appears to have an order of magnitude lower BH-to-bulge mass fraction. This is shown to be a part of a more general systematic relation: the BH/bulge mass fraction in AGNs is tightly correlated with the width of their broad emission lines. In addition we find a strong new correlation: the size of the broad-line region (BLR) in AGN is proportional to the bulge luminosity (or mass). We also look into the relation between the BH mass and the stellar velocity dispersion in the bulge. We find that also this relation is consistent for AGNs and quiescent galaxies, but it is less clear which relation the narrow-line AGNs follow. |
|
|
|
|
|
