NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-20 T22:08:01 PDT
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For refcode 2014ApJ...789...17H:
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Copyright by American Astronomical Society. Reproduced by permission
2014ApJ...789...17H The Black Hole Mass Scale of Classical and Pseudo Bulges in Active Galaxies Ho, Luis C.; Kim, Minjin Abstract. The mass estimator used to calculate black hole (BH) masses in broad-line active galactic nuclei (AGNs) relies on a virial coefficient (the "f factor") that is determined by comparing reverberation-mapped (RM) AGNs with measured bulge stellar velocity dispersions against the M_BH_-sigma_*_ relation of inactive galaxies. It has recently been recognized that only classical bulges and ellipticals obey a tight M_BH_-sigma_*_ relation; pseudobulges have a different zero point and much larger scatter. Motivated by these developments, we reevaluate the f factor for RM AGNs with available sigma_*_ measurements, updated Hbeta RM lags, and new bulge classifications based on detailed decomposition of high-resolution ground-based and space-based images. Separate calibrations are provided for the two bulge types, whose virial coefficients differ by a factor of ~2: f = 6.3 +/- 1.5 for classical bulges and ellipticals and f = 3.2 +/- 0.7 for pseudobulges. The structure and kinematics of the broad-line region, at least as crudely encoded in the f factor, seems to be related to the large-scale properties or formation history of the bulge. Lastly, we investigate the bulge stellar masses of the RM AGNs, show evidence for recent star formation in the AGN hosts that correlates with Eddington ratio, and discuss the potential utility of the M_BH_-M_bulge_ relation as a more promising alternative to the conventionally used M_BH_-sigma_*_ relation for future refinement of the virial mass estimator for AGNs. Key words: galaxies: active, galaxies: nuclei, galaxies: Seyfert, quasars: emission lines, quasars: general
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