Journal
ASTROPHYSICAL JOURNAL
Volume 772, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/772/1/49
Keywords
galaxies: bulges; galaxies: kinematics and dynamics; infrared: galaxies; techniques: spectroscopic
Categories
Funding
- National Research Foundation of Korea (NRF)
- Korea government (MEST) [2012-006087]
- Korea Astronomy and Space Science Institute (KASI)
- National Research Council of Science & Technology (NST), Republic of Korea [2013140006] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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To investigate the validity of the assumption that quiescent galaxies and active galaxies follow the same black hole mass (M-BH)-stellar velocity dispersion (sigma(*)) relation, as required for the calibration of M-BH estimators for broad line active galactic nuclei (AGNs), we determine and compare the M-BH-sigma(*) relations, respectively, for quiescent and active galaxies. For the quiescent galaxy sample, composed of 72 dynamical M-BH measurements, we update sigma(*) for 28 galaxies using homogeneous H-band measurements that are corrected for galaxy rotation. For active galaxies, we collect 25 reverberation-mapped AGNs and improve sigma(*) measurement for two objects. Combining the two samples, we determine the virial factor f, first by scaling the active galaxy sample to the M-BH-sigma(*) relation of quiescent galaxies, and second by simultaneously fitting the quiescent and active galaxy samples, as f = 5.1(-1.1)(+1.5) and f = 5.9(-1.5)(+2.1), respectively. The M-BH-sigma(*) relation of active galaxies appears to be shallower than that of quiescent galaxies. However, the discrepancy is caused by a difference in the accessible M-BH distribution at given sigma(*), primarily due to the difficulty of measuring reliable stellar velocity dispersion for the host galaxies of luminous AGNs. Accounting for the selection effects, we find that active and quiescent galaxies are consistent with following intrinsically the same M-BH-sigma(*) relation.
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