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26 April 2024 |
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Article overview
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Reverberation Mapping of the Broad-line Region in NGC 5548: Evidence for Radiation Pressure? | | Kai-Xing Lu
; Pu Du
; Chen Hu
; Yan-Rong Li
; Zhi-Xiang Zhang
; Kai Wang
; Ying-Ke Huang
; Shao-Lan Bi
; Jin-Ming Bai
; Luis C. Ho
; Jian-Min Wang
; | | Date: |
27 Jul 2016 | | Abstract: | NGC 5548 is the best-observed reverberation-mapped active galactic nucleus
with long-term, intensive monitoring. Here we report results from a new
observational campaign between January and July, 2015. We measure the centroid
time lag of the broad H$eta$ emission line with respect to the 5100 AA
continuum and obtain $ au_{
m cent} = 7.20^{+1.33}_{-0.35}$ days in the rest
frame. This yields a black hole mass of $M_{ullet}=8.71^{+3.21}_{-2.61} $x$
10^{7}M_{odot}$ using a broad H$eta$ line dispersion of $3124pm302$ km
s$^{-1}$ and a virial factor of $f_{_{
m BLR}}=6.3pm1.5$ for the broad-line
region (BLR), consistent with the mass measurements from previous H$eta$
campaigns. The high-quality data allow us to construct a velocity-binned delay
map for the broad H$eta$ line, which shows a symmetric response pattern
around the line center, a plausible kinematic signature of virialized motion of
the BLR. Combining all the available measurements of H$eta$ time lags and the
associated mean 5100 {AA} luminosities over 18 campaigns between 1989 and
2015, we find that the H$eta$ BLR size varies with the mean optical
luminosity, but, interestingly, with a possible delay of $2.35_{-1.25}^{+3.47}$
yrs. This delay coincides with the typical BLR dynamical timescale of NGC 5548,
indicating that the BLR undergoes dynamical changes, possibly driven by
radiation pressure. | | Source: | arXiv, 1607.8060 | | Services: | Forum | Review | PDF | Favorites | |
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