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• W2019968931 endingPage "98" @default.
• W2019968931 startingPage "98" @default.
• W2019968931 abstract "We propose a new method for estimating the mass of a supermassive black hole, applicable to obscured AGNs. This method estimates the black hole mass using the width of the narrow core of the neutral FeKa 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. We collect the line width data of the neutral FeKa line core for seven type-1 AGNs and seven type-2 AGNs obtained by the Chandra HETGS. Assuming the virial relation between the locations and the velocity widths of the neutral FeKa line core and the broad Hb emission line, the luminosity scaling relation of the neutral FeKa line core emitting region is estimated. We find that the FWHM of the neutral FeKa line core falls between that of the broad Balmer emission lines and the corresponding value at the dust reverberation radius for most of the type-1 AGNs and for all of the type-2 AGNs. This suggests that significant fraction of photons of the neutral FeKa line core originates between the outer BLR and the inner dust torus in most cases. The black hole mass M_FeKa estimated with this method is then compared with other black hole mass estimates, such as the broad emission-line reverberation mass M_rev for the type-1 AGNs, the mass M_H2O based on the H2O maser and the single-epoch mass estimate M_pol based on the polarized broad Balmer lines for the type-2 AGNs. We find that M_FeKa is consistent with M_rev for the most of the type-1 AGNs and with M_pol for all of the type-2 AGNs. We also find that M_FeKa is correlated well with M_H2O for the type-2 AGNs. These results suggest that M_FeKa is a potential indicator of the black hole mass especially for obscured AGNs. In contrast, M_FeKa for which the same virial factor as for M_rev and M_pol is adopted is systematically larger than M_H2O by about a factor of about 5. (abridged)" @default.
• W2019968931 created "2016-06-24" @default.
• W2019968931 creator A5003751526 @default.
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• W2019968931 date "2015-03-31" @default.
• W2019968931 modified "2023-10-04" @default.
• W2019968931 title "A NEW BLACK HOLE MASS ESTIMATE FOR OBSCURED ACTIVE GALACTIC NUCLEI" @default.
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• W2019968931 doi "https://doi.org/10.1088/0004-637x/802/2/98" @default.
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