A significant fraction of nearby galaxies show evidence of weak nuclear activity unrelated to
normal stellar processes. Recent high-resolution, multiwavelength observations indicate that …

We reinvestigate the relationship between the characteristic broad-line region size (R BLR)
and the Balmer emission-line, X-ray, UV, and optical continuum luminosities. Our study …

We present high-resolution Hubble Space Telescope images of all 35 active galactic nuclei
(AGNs) with optical reverberation-mapping results, which we have modeled to create a …

As a step toward elucidating the physical conditions in nearby active galaxies, this paper
presents spectral energy distributions (SEDs) of a sample of seven low-luminosity active …

We present results from a monitoring programme of 42 quasars from the Palomar-Green
sample. The objects were observed for seven years at the Wise Observatory, as part of a …

Historically, Seyfert nuclei have been considered to be radio-quiet active galactic nuclei
(AGNs). We question this widely held assumption by showing that the distribution of the …

We present extinction curves derived from the broad emission lines and continua of samples
of 72 radio-loud and 1018 radio-quiet active galactic nuclei (AGNs). The curves are …

A study of the Baldwin effect in the IUE data set ADS Classic is now deprecated. It will be
completely retired in October 2019. This page will automatically redirect to the new ADS …

Spectra taken with the Hubble Space Telescope (HST) reveal that NGC 4450 emits Balmer
emission lines with displaced double peaks and extremely high velocity wings. This …

Results are presented on the X-ray emission from 13 objects, observed by Ginga as part of a
spectral survey of bright quasars in the energy range 2-20 keV. The distribution of the power …