3 papers
astro-ph1998
Properties of warm absorbers in active galaxies
Stefanie Komossa, Henner Fink
We present a study of the nature of warm absorbers on the basis of ROSAT X-ray observations and photoionization calculations carried out with the code Cloudy. We focus on `non-stan…
astro-ph1996
A ROSAT observation of the warm-absorbed soft X-ray spectrum of NGC 4051
Stefanie Komossa, Henner Fink
We present and analyze a pointed ROSAT PSPC observation of the Seyfert galaxy NGC 4051. The X-ray spectrum consists of a powerlaw modified by absorption edges and an additional sof…
astro-ph1995
Soft X-ray properties of "narrow-line" Seyfert 1 galaxies
Th. Boller, W. N. Brandt, H. Fink
We report on AGN with extremely soft X-ray spectra observed with ROSAT. From their optical emission lines these objects are classified as narrow-line Seyfert 1 galaxies (NLS1), alm…