We have identified 12 Seyfert 1 galaxies that exhibit optical polarization spectra similar to
those of Seyfert 2 galaxies in which polarized broad lines are detected. We present new …

We present a power spectral analysis of a 100-ks XMM–Newton observation of the Narrow
Line Seyfert 1 galaxy Ark 564. When combined with earlier RXTE and ASCA observations …

We present optical spectropolarimetry of the nuclei of 36 Seyfert 1 galaxies, obtained with
the William Herschel and the Anglo-Australian Telescopes from 1996 to 1999. In 20 of these …

We present the first results from a high sampling rate, multimonth reverberation mapping
campaign undertaken primarily at MDM Observatory with supporting observations from …

Comparison of 8.4 GHz radio images of a sample of eleven, early-type Seyfert galaxies with
previous observations reveals possible variation in the nuclear radio flux density in five of …

Archival XMM–Newton data on the nearby Seyfert galaxy NGC 4051, taken in relatively high‐
and low‐flux states, offer a unique opportunity to explore the complexity of its X‐ray …

Previous ground-based observations of the Seyfert 2 galaxy Mrk 78 revealed a double set of
emission lines, similar to those seen in several active galactic nuclei (AGNs) from recent …

To understand the origin of radio emission in radio-quiet active galactic nucleus (AGN) and
differentiate between the contributions from star formation, AGN accretion, and jets, we have …

In this work, we revisit the relationship between [O iii] line width w 90 (as the indicator of
active galactic nucleus outflow velocity) and the radio emission in radio-quiet quasars …

We characterize for the first time the torus properties of an ultra-hard X-ray (14–195 keV)
volume-limited (DL< 40 Mpc) sample of 24 Seyfert (Sy) galaxies (BCS40 sample). The …