201 citations · 401 across the 10 of their papers we have counts for
10 papers
New active galactic nuclei detected in ROSAT All Sky Survey galaxies - The complete dataset
W. Kollatschny, R. Kotulla, W. Pietsch +2
The ROSAT ALL Sky Survey Bright Source Catalogue (RASS-BSC) has been correlated with the Catalogue of Principal Galaxies (PGC) to identify new extragalactic counterparts. 550 relia…
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…
Geometry and Kinematics in the Central Broad-Line Region of a Seyfert 1 Galaxy
W. Kollatschny, K. Bischoff
We recorded spectra of the highly variable Seyfert 1 galaxy Mrk110 in a variability campaign with the 9.2m Hobby-Eberly Telescope at McDonald Observatory in order to study the deta…
Short-term emission line and continuum variations in Mrk110
W. Kollatschny, K. Bischoff, E. L. Robinson +2
We present results of a variability campaign of Mrk110 performed with the 9.2-m Hobby-Eberly Telescope (HET) at McDonald Observatory. The high S/N spectra cover most of the optical…
New NLS1 galaxies detected among RASS galaxies
W. Pietsch, K. Bischoff, Th. Boller
Six Narrow-Line Seyfert 1 galaxies have been discovered in optical follow-up spectroscopy of nuclei of galaxies selected for their high X-ray flux in the ROSAT All Sky Survey. We g…
Strong optical line variability in Mkn 110
K. Bischoff, W. Kollatschny
We present results of a long-term variability campaign on the Seyfert 1 galaxy Markarian 110. Mkn 110 is a narrow-line Seyfert 1 object hosted in a morphological peculiar galaxy. W…