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The supermassive black hole masses of reverberation-mapped active galactic nuclei | | Li-Ming Yu
; Wei-Hao Bian
; Xue-Guang Zhang
; Bi-Xuan Zhao
; Chan Wang
; Xue Ge
; Bing-Qian Zhu
; Yu-Qin Chen
; | | Date: |
15 Aug 2020 | | Abstract: | Using different kinds of velocity tracers derived from the broad H$eta$
profile (in the mean or rms spectrum) and the corresponding virial factors $f$,
the central supermassive black hole (SMBH) masses ($M_{
m BH}$) are calculated
for a compiled sample of 120 reverberation-mapped (RM) AGNs. For its subsample
of RM AGNs with measured stellar velocity dispersion ($sigma_{
m ast}$), the
multivariate linear regression technique is used to calibrate the mean value
$f$, as well as the variable FWHM-based $f$. It is found that, whether
excluding the pseudo-bulges or not, $M_{
m BH}$ from the H$eta$ line
dispersion in the mean spectrum ($sigma_{
m Heta,mean}$) has the smallest
offset rms with respect to the $M_{
m BH}-sigma_{ast}$ relation. For the
total sample excluding SDSS-RM AGNs, with respect to $M_{
m BH}$ from
$sigma_{
m ast}$ or that from the H$eta$ line dispersion in the rms
spectrum ($sigma_{
m Heta,rms}$), it is found that we can obtain $M_{
m
BH}$ from the $sigma_{
m Heta,mean}$ with the smallest offset rms of 0.38
dex or 0.23 dex, respectively. It implies that, with respect to the H$eta$
FWHM, we prefer $sigma_{
m Heta,mean}$ to calculate $M_{
m BH}$ from the
single-epoch spectrum. Using the FWHM-based $f$, we can improve $M_{
m BH}$
calculation from FWHM(H$eta$) and the mean $f$, with a decreased offset rms
from 0.52 dex to 0.39 dex with respect to $M_{
m BH}$ from $sigma_{
m ast}$
for the subsample of 36 AGNs with $sigma_{
m ast}$. The value of 0.39 dex is
almost the same as that from $sigma_{
m Heta,mean}$ and the mean $f$. | | Source: | arXiv, 2008.06623 | | Services: | Forum | Review | PDF | Favorites | |
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