2016ApJ...827..118L -
Astrophys. J., 827, 118-118 (2016/August-3)
Reverberation mapping of the broad-line region in NGC 5548: evidence for radiation pressure?
LU K.-X., DU P., HU C., LI Y.-R., ZHANG Z.-X., WANG K., HUANG Y.-K., BI S.-L., BAI J.-M., HO L.C. and WANG J.-M.
Abstract (from CDS):
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 2015 January and July. We measure the centroid time lag of the broad Hβ emission line with respect to the 5100 A continuum and obtain τ{cent}={7.20}_{-0.35}+1.33 days in the rest frame. This yields a black hole mass of {M}_•={8.71}{-2.61}^{+3.21}×{10}^{7}{M}_☉_ using a broad Hβ line dispersion of 3124±302 km/s and a virial factor of {f}{{BLR}_=6.3±1.5 for the broad-line region (BLR), consistent with the mass measurements from previous Hβ campaigns. The high-quality data allow us to construct a velocity-binned delay map for the broad Hβ 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 Hβ time lags and the associated mean 5100 A luminosities over 18 campaigns between 1989 and 2015, we find that the Hβ BLR size varies with the mean optical luminosity, but, interestingly, with a possible delay of 2.35–1.25+3.47 years. This delay coincides with the typical BLR dynamical timescale of NGC 5548, indicating that the BLR undergoes dynamical changes, possibly driven by radiation pressure.
Abstract Copyright:
© 2016. The American Astronomical Society. All rights reserved.
Journal keyword(s):
galaxies: active - galaxies: individual: NGC 5548 - galaxies: nuclei - galaxies: nuclei
VizieR on-line data:
<Available at CDS (J/ApJ/827/118): table1.dat table4.dat>
Simbad objects:
1
Full paper
View the references in ADS
To bookmark this query, right click on this link: simbad:2016ApJ...827..118L and select 'bookmark this link' or equivalent in the popup menu