期刊
ASTROPHYSICAL JOURNAL
卷 707, 期 2, 页码 1334-1346出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/707/2/1334
关键词
black hole physics; galaxies: active; quasars: emission lines; quasars: general
资金
- Chinese NSF [NSF-10533050, NSF-10703006]
- National Basic Research Program of China (973 Program) [2009CB824800]
- CAS Knowledge Innovation Program [KJCX2-YW-T05]
- Carnegie Institution for Science. Funding
- Alfred P. Sloan Foundation
- National Science Foundation
- U.S. Department of Energy
- National Aeronautics and Space Administration
- Japanese Monbukagakusho
- Max Planck Society
- Higher Education Funding Council for England
We investigate the relationship between the linewidths of broad Mg II lambda 2800 and H beta in active galactic nuclei (AGNs) to refine them as tools to estimate black hole (BH) masses. We perform a detailed spectral analysis of a large sample of AGNs at intermediate redshifts selected from the Sloan Digital Sky Survey, along with a smaller sample of archival ultraviolet spectra for nearby sources monitored with reverberation mapping (RM). Careful attention is devoted to accurate spectral decomposition, especially in the treatment of narrow-line blending and Fe II contamination. We show that, contrary to popular belief, the velocity width of Mg II tends to be smaller than that of H beta, suggesting that the two species are not cospatial in the broad-line region. Using these findings and recently updated BH mass measurements from RM, we present a new calibration of the empirical prescriptions for estimating virial BH masses for AGNs using the broad Mg II and H beta lines. We show that the BH masses derived from our new formalisms show subtle but important differences compared to some of the mass estimators currently used in the literature.
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