159 citations · 574 across the 21 of their papers we have counts for
4 papers · 1 filter
Identification of a complete sample of northern ROSAT All-sky survey X-ray sources. VII. The AGN subsample
I. Appenzeller, F. -J. Zickgraf, J. Krautter +1
In order to derive statistical properties of a complete X-ray selected sample of AGN we used the classification spectra of the RASS Selected Areas-North survey to study the luminos…
The ORFEUS II Echelle Spectrometer: Instrument description, performance and data reduction
J. Barnstedt, N. Kappelmann, I. Appenzeller +11
During the second flight of the ORFEUS-SPAS mission in November/December 1996, the Echelle spectrometer was used extensively by the Principal and Guest Investigator teams as one of…
Coronal lines and the warm X-ray absorber in Seyfert 1 Galaxies
M. Pfeiffer, I. Appenzeller, S. Wagner
The connection between the coronal lines and the warm absorber is examined systematically. In an earlier work it was found that the coronal line emitting plasma and the warm absorb…
Spectra of High Redshift Galaxies using a Cluster as a Gravitational Telescope
D. Mehlert, S. Seitz, R. P. Saglia +7
Using the Focal Reducer Spectrograph (FORS) at the Very Large Telescope (VLT) during the FORS commissioning time in December 1998 we took long slit spectra of the gravitational arc…