3 papers
astro-ph2007
Discovery of Polarization Reverberation in NGC 4151
C. Martin Gaskell, Rene W. Goosmann, Nelly I. Merkulova +2
Observations of the optical polarization of NGC 4151 in 1997-2003 show variations of an order of magnitude in the polarized flux while the polarization position angle remains const…
astro-ph2002
Steps Toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. XVI. A Thirteen-Year Study of Spectral Variability in NGC 5548
B. M. Peterson, the International AGN Watch
We present the final installment of an intensive 13-year study of variations of the optical continuum and broad H-beta emission line in the Seyfert 1 galaxy NGC 5548. The data base…
astro-ph2001
A Spectroscopic and Photometric Study of Short-Timescale Variability in NGC5548
M. Dietrich, C. F. Bender, D. J. Bergmann +19
Results of a ground-based optical monitoring campaign on NGC5548 in June 1998 are presented. The broad-band fluxes (U,B,V), and the spectrophotometric optical continuum flux F_lamb…