4 papers
Spatial and spectral X-ray properties of the powerful radio galaxy Hercules A: environment and jet/ICM interaction
J. Siebert, N. Kawai, W. Brinkmann
We investigate the X-ray properties of the powerful radio galaxy Hercules A (3C 348) using ROSAT HRI, PSPC and ASCA observations. The ASCA data are well fit by a thermal plasma mod…
The warm absorber in IRAS 13349+2438: dusty or not?
J. Siebert, S. Komossa, W. Brinkmann
IRAS13349+2438 was the first quasar suggested to host a warm absorber with internal dust. We obtained new HRI data for this object and derive constraints on the X-ray emitting regi…
An ASCA observation of the radio-loud narrow-line Seyfert 1 galaxy RGB J0044+193
J. Siebert, K. M. Leighly, S. A. Laurent-Muehleisen +3
We present the results of an ASCA observation of the radio-loud NLS1 galaxy RGB J0044+193. The X-ray data are complemented by radio observations and a new optical spectrum for this…
ASCA observations of high redshift quasars
J. Siebert, M. Matsuoka, W. Brinkmann +3
ASCA observations of 4 high redshift radio--loud quasars with 1.44z3.21 are presented. The spectral analysis for three of them (PKS 0332-403, PKS 0537-286, PKS 2149-306) reve…