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16 April 2024 |
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Extending the Calibration of CIV-Based Single-Epoch Black Hole Mass Estimators for Active Galactic Nuclei | | Daeseong Park
; Aaron J. Barth
; Jong-Hak Woo
; Matthew A. Malkan
; Tommaso Treu
; Vardha N. Bennert
; Roberto J. Assef
; Anna Pancoast
; | | Date: |
29 Mar 2017 | | Abstract: | We provide an updated calibration of CIV $lambda1549$ broad emission
line-based single-epoch (SE) black hole (BH) mass estimators for active
galactic nuclei (AGNs) using new data for six reverberation-mapped AGNs at
redshift $z=0.005-0.028$ with BH masses (bolometric luminosities) in the range
$10^{6.5}-10^{7.5}$ $M_{odot}$ ($10^{41.7}-10^{43.8}$ erg s$^{
m -1}$). New
rest-frame UV-to-optical spectra covering 1150-5700 AA for the six AGNs were
obtained with the Hubble Space Telescope (HST). Multi-component spectral
decompositions of the HST spectra were used to measure SE emission-line widths
for the CIV, MgII, and H$eta$ lines as well as continuum luminosities in the
spectral region around each line. We combine the new data with similar
measurements for a previous archival sample of 25 AGNs to derive the most
consistent and accurate calibrations of the CIV-based SE BH mass estimators
against the H$eta$ reverberation-based masses, using three different measures
of broad-line width: full-width at half maximum (FWHM), line dispersion
($sigma_{
m line}$) and mean absolute deviation (MAD). The newly expanded
sample at redshift $z=0.005-0.234$ covers a dynamic range in BH mass
(bolometric luminosity) of $log M_{
m BH}/M_{odot} = 6.5-9.1$ ($log
L_{
m bol}/$erg s$^{
m -1}=41.7-46.9$), and we derive the new CIV-based mass
estimators using a Bayesian linear regression analysis over this range. We
generally recommend the use of $sigma_{
m line}$ or MAD rather than FWHM to
obtain a less biased velocity measurement of the CIV emission line, because its
narrow-line component contribution is difficult to decompose from the
broad-line profile. | | Source: | arXiv, 1703.9867 | | Services: | Forum | Review | PDF | Favorites | |
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