Calibration of the virial factor f in supermassive black hole masses of reverberation-mapped AGNs
ABSTRACT Using a compiled sample of 34 broad-line active galactic nuclei (AGNs) with measured H β time lags from the reverberation mapping (RM) method and measured bulge stellar velocity dispersions σ*, we calculate the virial factor f by assuming that the RM AGNs intrinsically obey the same MBH−σ*...
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Published in | Monthly notices of the Royal Astronomical Society Vol. 488; no. 2; pp. 1519 - 1534 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
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Oxford University Press
11.09.2019
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Abstract | ABSTRACT
Using a compiled sample of 34 broad-line active galactic nuclei (AGNs) with measured H β time lags from the reverberation mapping (RM) method and measured bulge stellar velocity dispersions σ*, we calculate the virial factor f by assuming that the RM AGNs intrinsically obey the same MBH−σ* relation as quiescent galaxies, where MBH is the mass of the supermassive black hole (SMBH). Considering four tracers of the velocity of the broad-line regions (BLRs), i.e. the H β line width or line dispersion from the mean or rms spectrum, there are four kinds of the factor f. Using the H β full width at half-maximum (FWHM) to trace the BLRs velocity, we find significant correlations between the factor f and some observational parameters, e.g. FWHM, the line dispersion. Using the line dispersion to trace the BLRs velocity, these relations disappear or become weaker. It implies the effect of inclination in BLRs geometry. It also suggests that the variable f in MBH estimated from luminosity and FWHM in a single-epoch spectrum is not negligible. Using a simple model of thick-disc BLRs, we also find that, as the tracer of the BLRs velocity, H β FWHM has some dependence on the inclination, while the line dispersion σH β is insensitive to the inclination. Considering the calibrated FWHM-based factor f from the mean spectrum, the scatter of the SMBH mass is 0.39 dex for our sample of 34 low-redshift RM AGNs. For a high-redshift sample of 30 Sloan Digital Sky Survey RM AGNs with measured stellar velocity dispersions, we find that the SMBH mass scatter is larger than that for our sample of 34 low-redshift RM AGNs. It implies the possibility of evolution of the MBH−σ* relation from high-redshift to low-redshift AGNs. |
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AbstractList | ABSTRACT
Using a compiled sample of 34 broad-line active galactic nuclei (AGNs) with measured H β time lags from the reverberation mapping (RM) method and measured bulge stellar velocity dispersions σ*, we calculate the virial factor f by assuming that the RM AGNs intrinsically obey the same MBH−σ* relation as quiescent galaxies, where MBH is the mass of the supermassive black hole (SMBH). Considering four tracers of the velocity of the broad-line regions (BLRs), i.e. the H β line width or line dispersion from the mean or rms spectrum, there are four kinds of the factor f. Using the H β full width at half-maximum (FWHM) to trace the BLRs velocity, we find significant correlations between the factor f and some observational parameters, e.g. FWHM, the line dispersion. Using the line dispersion to trace the BLRs velocity, these relations disappear or become weaker. It implies the effect of inclination in BLRs geometry. It also suggests that the variable f in MBH estimated from luminosity and FWHM in a single-epoch spectrum is not negligible. Using a simple model of thick-disc BLRs, we also find that, as the tracer of the BLRs velocity, H β FWHM has some dependence on the inclination, while the line dispersion σH β is insensitive to the inclination. Considering the calibrated FWHM-based factor f from the mean spectrum, the scatter of the SMBH mass is 0.39 dex for our sample of 34 low-redshift RM AGNs. For a high-redshift sample of 30 Sloan Digital Sky Survey RM AGNs with measured stellar velocity dispersions, we find that the SMBH mass scatter is larger than that for our sample of 34 low-redshift RM AGNs. It implies the possibility of evolution of the MBH−σ* relation from high-redshift to low-redshift AGNs. |
Author | Ge, Xue Bian, Wei-Hao Yu, Li-Ming Wang, Chan Zhao, Bi-Xuan |
Author_xml | – sequence: 1 givenname: Li-Ming surname: Yu fullname: Yu, Li-Ming organization: School of Physics and Technology, Nanjing Normal University, Nanjing 210046, China – sequence: 2 givenname: Wei-Hao orcidid: 0000-0002-2121-8960 surname: Bian fullname: Bian, Wei-Hao email: whbian@njnu.edu.cn organization: School of Physics and Technology, Nanjing Normal University, Nanjing 210046, China – sequence: 3 givenname: Chan surname: Wang fullname: Wang, Chan organization: School of Physics and Technology, Nanjing Normal University, Nanjing 210046, China – sequence: 4 givenname: Bi-Xuan surname: Zhao fullname: Zhao, Bi-Xuan organization: School of Physics and Technology, Nanjing Normal University, Nanjing 210046, China – sequence: 5 givenname: Xue surname: Ge fullname: Ge, Xue organization: School of Physics and Technology, Nanjing Normal University, Nanjing 210046, China |
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Keywords | quasars: emission lines quasars: general galaxies: Seyfert galaxies: nuclei galaxies: active |
Language | English |
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Using a compiled sample of 34 broad-line active galactic nuclei (AGNs) with measured H β time lags from the reverberation mapping (RM) method and... |
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Title | Calibration of the virial factor f in supermassive black hole masses of reverberation-mapped AGNs |
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