A new black hole mass estimate for obscured active galactic nuclei
- Institute of Astronomy, School of Science, The University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015 (Japan)
- Department of Physics, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601 (Japan)
We propose a new method for estimating the mass of a supermassive black hole, applicable to obscured active galactic nuclei (AGNs). This method estimates the black hole mass using the width of the narrow core of the neutral FeKα emission line in X-rays and the distance of its emitting region from the black hole based on the isotropic luminosity indicator via the luminosity scaling relation. Assuming the virial relation between the locations and the velocity widths of the neutral FeKα line core and the broad Hβ emission line, the luminosity scaling relation of the neutral FeKα line core emitting region is estimated. We find that the velocity width of the neutral FeKα line core falls between that of the broad Balmer emission lines and the corresponding value at the dust reverberation radius for most of the target AGNs. The black hole mass M{sub BH,FeKα} estimated with this method is then compared with other black hole mass estimates, such as the broad emission-line reverberation mass M{sub BH,rev} for type 1 AGNs, the mass M{sub BH,H{sub 2O}} based on the H{sub 2}O maser, and the single-epoch mass estimate M{sub BH,pol} based on the polarized broad Balmer lines for type 2 AGNs. We find that M{sub BH,FeKα} is consistent with M{sub BH,rev} and M{sub BH,pol}, and find that M{sub BH,FeKα} correlates well with M{sub BH,H{sub 2O}}. These results suggest that M{sub BH,FeKα} is a potential indicator of the black hole mass for obscured AGNs. In contrast, M{sub BH,FeKα} is systematically larger than M{sub BH,H{sub 2O}} by about a factor of 5, and the possible origins are discussed.
- OSTI ID:
- 22882590
- Journal Information:
- Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 2 Vol. 802; ISSN ASJOAB; ISSN 0004-637X
- Country of Publication:
- United Kingdom
- Language:
- English
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