Matsuoka, K. and Capak, P. (2013) A Comparative Analysis of Virial Black Hole Mass Estimates of Moderate-luminosity Active Galactic Nuclei Using Subaru/FMOS. Astrophysical Journal, 771 (1). Art. No. 64. ISSN 0004-637X. http://resolver.caltech.edu/CaltechAUTHORS:20130815-101140877
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We present an analysis of broad emission lines observed in moderate-luminosity active galactic nuclei (AGNs), typical of those found in X-ray surveys of deep fields, with the goal of testing the validity of single-epoch virial black hole mass estimates. We have acquired near-infrared spectra of AGNs up to z ~ 1.8 in the COSMOS and Extended Chandra Deep Field-South Survey, with the Fiber Multi-Object Spectrograph mounted on the Subaru telescope. These near-infrared spectra provide a significant detection of the broad Hα line, shown to be a reliable probe of black hole mass at low redshift. Our sample has existing optical spectroscopy that provides a detection of Mg II, typically used for black hole mass estimation at z gsim 1. We carry out a spectral-line fitting procedure using both Hα and Mg II to determine the virial velocity of gas in the broad-line region, the continuum luminosity at 3000 Å, and the total Hα line luminosity. With a sample of 43 AGNs spanning a range of two decades in luminosity, we find a tight correlation between the ultraviolet and emission-line luminosity. There is also a close one-to-one relationship between the full width at half-maximum of Hα and Mg II. Both of these then lead to there being very good agreement between Hα- and Mg II-based masses over a wide range in black hole mass, i.e., M_BH ~ 10^(7-9) M_☉. In general, these results demonstrate that local scaling relations, using Mg II or Hα, are applicable for AGNs at moderate luminosities and up to z ~ 2.
|Additional Information:||© 2013 American Astronomical Society. Received 2013 January 10; accepted 2013 May 8; published 2013 June 17. We thank Kentaro Aoki and Naoyuki Tamura for their invaluable assistance during our Subaru/FMOS observations. K.M. acknowledges financial support from the Japan Society for the Promotion of Science (JSPS). T.N. is financially supported by JSPS (grant No. 23654068). Data analyses were carried out in part on common-use data analysis computer system at the Astronomy Data Center, ADC, of the National Astronomical Observatory of Japan (NAOJ).|
|Subject Keywords:||black hole physics; galaxies: active; quasars: emission lines|
|Official Citation:||A Comparative Analysis of Virial Black Hole Mass Estimates of Moderate-luminosity Active Galactic Nuclei Using Subaru/FMOS K. Matsuoka et al. 2013 ApJ 771 64|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||16 Aug 2013 20:07|
|Last Modified:||06 Jul 2015 17:37|
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