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. 
B.M. Peterson, C.J. Grier, Keith Horne, R.W. Pogge, M.C. Bentz, G. De   Rosa, K.D. Denney, Paul Martini, S.G. Sergeev, S. Ka...
astro-ph.GA