NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-19 T11:56:34 PDT
Help | Comment | NED Home

For refcode 2012ApJ...753L...2A:
Retrieve 34 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
2012ApJ...753L...2A The Importance of Broad Emission Line Widths in Single-epoch Black Hole Mass Estimates Assef, R. J.; Frank, S.; Grier, C. J.; Kochanek, C. S.; Denney, K. D.; Peterson, B. M. Abstract. Estimates of the mass of super-massive black holes (BHs) in distant active galactic nuclei (AGNs) can be obtained efficiently only through single-epoch (SE) spectra, using a combination of their broad emission line widths and continuum luminosities. Yet the reliability and accuracy of the method and the resulting mass estimates, M_BH_, remain uncertain. A recent study by Croom using a sample of Sloan Digital Sky Survey, 2dF QSO Redshift Survey, and 2dF-SDSS LRG and QSO Survey quasars suggests that line widths contribute little information about the BH mass in these SE estimates and can be replaced by a constant value without significant loss of accuracy. In this Letter, we use a sample of nearby reverberation-mapped AGNs to show that this conclusion is not universally applicable. We use the bulge luminosity (L_Bulge_) of these local objects to test how well the known M_BH_-L_Bulge_ correlation is recovered when using randomly assigned line widths instead of the measured ones to estimate M_BH_. We find that line widths provide significant information about M_BH_, and that for this sample, the line width information is just as significant as that provided by the continuum luminosities. We discuss the effects of observational biases upon the analysis of Croom and suggest that the results can probably be explained as a bias of flux-limited, shallow quasar samples. Key words: galaxies: active, quasars: emission lines
Retrieve 34 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home