201 citations · 401 across the 10 of their papers we have counts for
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Properties of new X-ray selected AGN
K. Bischoff, W. Pietsch, T. Boller +3
We present the results of a program to identify so far unknown active nuclei (AGN) in galaxies. Candidate galactic nuclei have been selected for optical spectroscopy from a cross-c…
Profile variations in AGN spectra
W. Kollatschny, K. Bischoff
We present results of optical long-term variability campaigns (10 - 20 years) of the two Seyfert galaxies NGC 7603 and Mrk 110. The variations of the continuum, of the individual b…
Steps Toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. XV. Long-Term Optical Monitoring of NGC 5548
B. M. Peterson, A. J. Barth, P. Berlind +34
We present the results of three years of ground-based observations of the Seyfert 1 galaxy NGC 5548, which combined with previously reported data, yield optical continuum and broad…
New active galactic nuclei detected in ROSAT All Sky Survey galaxies; Part I: Verification of selection strategy
W. Pietsch, Th. Boller, S. Doebereiner +3
We present the first results of a program to identify so far unknown active nuclei (AGN) in galaxies. Candidate galactic nuclei have been selected for optical spectroscopy from a c…