Active galactic nuclei (AGNs) are known to show flux variability over all observable
timescales and across the entire electromagnetic spectrum. Over the past decade, a growing …

The broad emission lines in the spectra of active galactic nuclei respond to variations in the
luminosity of the central continuum source with a delay due to light-travel time effects within …

Abstract The AGN Black Hole Mass Database is a compilation of all published spectroscopic
reverberation-map** studies of active galaxies. We have created a public Web interface …

We present ground-based optical photometric monitoring data for NGC 5548, part of an
extended multiwavelength reverberation map** campaign. The light curves have nearly …

We present a systematic search for changing-look quasars based on repeat photometry from
Sloan Digital Sky Survey (SDSS) and Pan-STARRS1, along with repeat spectra from SDSS …

We present improved black hole masses for 35 active galactic nuclei (AGNs) based on a
complete and consistent reanalysis of broad emission-line reverberation-map** data …

Research into active galactic nuclei (AGN)–the compact, luminous hearts of many galaxies–
is at the forefront of modern astrophysics. Understanding these objects requires extensive …

We present four improved empirical relationships useful for estimating the central black hole
mass in nearby AGNs and distant luminous quasars alike using either optical or UV single …

▪ Abstract A large collective effort to study the variability of active galactic nuclei (AGN) over
the past decade has led to a number of fundamental results on radio-quiet AGN and blazars …

The lack of a significant silicate or silicon carbide emission feature in bright active galactic
nuclei (AGNs) is used to constrain models in which the IR continuum is emitted by dust. We …