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Black hole masses in type II AGNs from the Sloan Digital Sky Survey

Published online by Cambridge University Press:  01 August 2006

W. Bian ,
Q. Gu  and
Y. Zhao
W. Bian
Affiliation:
Dept. of Physics and Inst. of Theor. Phys., Nanjing Normal Univ., Nanjing 210097, China email: bianwh@ihep.ac.cn Key Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, China
Q. Gu
Affiliation:
Department of Astronomy, Nanjing University, Nanjing 210093, China
Y. Zhao
Affiliation:
Department of Astronomy, Nanjing University, Nanjing 210093, China
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Abstract

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The stellar population synthesis method is used to model the stellar contribution for a sample of 209 type II AGNs at 0.3>z>0.83 from the Sloan Digital Sky Survey. The reliable stellar velocity dispersions are obtained for 33 type II AGNs with significant stellar absorption features. We use the formula of Greene & Ho to obtain the corrected stellar velocity dispersions (σ*c). 20 of which can be classified as type II quasars. The SMBHs masses and the Eddington ratios are calculated. We measure the gas velocity dispersion (σg) from NLRs, and find that the relation between σg and σ*c becomes much weaker at higher redshifts than at smaller redshifts. We find that the deviation of σg from σ*c is correlated with the Eddington ratio.

Keywords

Galaxies: active – galaxies: nuclei – quasars: emission lines
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S238: Black Holes from Stars to Galaxies – Across the Range of Masses , August 2006 , pp. 325 - 326
Copyright
Copyright © International Astronomical Union 2007

References

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