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Seyferts in galaxy pairs and groups
The occurrence of Seyfert galaxies in 6 samples representative of different cosmological environments (i.e. isolated pairs, compact and loose groups) is analysed. To avoid... -
NGC 4151 line-continuum diagram sequences
We present the first results of an 8-year spectroscopic monitoring of the Seyfert 1.5 galaxy NGC 4151 carried out with a CCD spectrograph at the 2.6-m Shajn Telescope of the... -
NGC 5548 continuum light curve
The variations of the [OIII]{lambda}5007 line profile in NGC 5548 are examine d from CCD spectra obtained at the Ohio State University and Crimean Astrophysic al Observatory in... -
Identification of X-ray sources around Seyferts
Excess numbers of X-ray sources around bright Seyfert galaxies have been demonstrated with significances of association up to 7.4-sigma (Radecke, 1997A&A...319...18R). The... -
X-ray sources <1 degree from Seyfert galaxies
Archived PSPC observations of 26 Seyfert galaxies have been analyzed for bright X-ray sources out to the full extent of the field (< about 50'). Of all Seyferts known this... -
NGC 5548 Profile variability
Optical emission line intensities of the variable Seyfert 1 galaxy NGC 5548 are presented. -
An Ultraviolet Atlas of Quasar and Blazar Spectra
This atlas contains the ultraviolet spectra of 70 quasars, blazars, and Seyfert 1 galaxies that were produced by combining over 100 low resolution spectra from the International... -
Seyfert 1 AGNs with X-ray sp. from NuSTAR+Swift
The corona is an integral component of active galactic nuclei (AGNs) which produces the bulk of the X-ray emission above 1-2keV. However, many of its physical properties and the...
