17 research outputs found
Reverberation Mapping Results for Five Seyfert 1 Galaxies
We present the results from a detailed analysis of photometric and
spectrophotometric data on five Seyfert 1 galaxies observed as a part of a
recent reverberation mapping program. The data were collected at several
observatories over a 140-day span beginning in 2010 August and ending in 2011
January. We obtained high sampling-rate light curves for Mrk 335, Mrk 1501,
3C120, Mrk 6, and PG2130+099, from which we have measured the time lag between
variations in the 5100 Angstrom continuum and the H-beta broad emission line.
We then used these measurements to calculate the mass of the supermassive black
hole at the center of each of these galaxies. Our new measurements
substantially improve previous measurements of MBH and the size of the broad
line-emitting region for four sources and add a measurement for one new object.
Our new measurements are consistent with photoionization physics regulating the
location of the broad line region in active galactic nuclei.Comment: 45 pages, 5 figures. Accepted for publication in ApJ. For a brief
video explaining the key results of this paper, see
http://www.youtube.com/user/OSUAstronom
Reverberation Mapping of the Seyfert 1 Galaxy NGC 7469
A large reverberation mapping study of the Seyfert 1 galaxy NGC 7469 has
yielded emission-line lags for Hbeta 4861 and He II 4686 and a central black
hole mass measurement of about 10 million solar masses, consistent with
previous measurements. A very low level of variability during the monitoring
campaign precluded meeting our original goal of recovering velocity-delay maps
from the data, but with the new Hbeta measurement, NGC 7469 is no longer an
outlier in the relationship between the size of the Hbeta-emitting broad-line
region and the AGN luminosity. It was necessary to detrend the continuum and
Hbeta and He II 4686 line light curves and those from archival UV data for
different time-series analysis methods to yield consistent results.Comment: 9 Pages, 7 figures, 6 tables. Accepted for publication in The
Astrophysical Journa
A Reverberation Lag for the High-Ionization Component of the Broad Line Region in the Narrow-Line Seyfert 1 Mrk 335
We present the first results from a detailed analysis of photometric and
spectrophotometric data on the narrow-line Seyfert 1 galaxy Mrk 335, collected
over a 120-day span in the fall of 2010. From these data we measure the lag in
the He II 4686 broad emission line relative to the optical continuum to be 2.7
\pm 0.6 days and the lag in the H\beta 4861 broad emission line to be 13.9 \pm
0.9 days. Combined with the line width, the He II lag yields a black hole mass,
MBH = (2.6 \pm 0.8)\times 10^7 Msun. This measurement is consistent with
measurements made using the H\beta 4861 line, suggesting that the He II
emission originates in the same region as H\beta, but at a much smaller radius.
This constitutes the first robust lag measurement for a high-ionization line in
a narrow-line Seyfert 1 galaxy.Comment: 7 pages, 3 figures. Accepted for publication in ApJ Letters. For a
brief video explaining the key results of this paper, see
http://www.youtube.com/user/OSUAstronomy#p/a/u/0/Z2UCxQG5iO