12 papers
X-ray transient AGN and galaxies, and why we need new soft X-ray surveys
D. Grupe
X-ray transience is the most extreme form of variability observed in AGN or normal non-active galaxies. While factors of 2-3 on timescales of days to years are quite common among A…
A cookbook for the XMMSAS
D. Grupe
This paper will give a short description of a `cookbook' for the XMM-Newton data reduction software XMMSAS. This `cookbook' has been developed at the Max-Planck-Institut für extrat…
X-ray transient AGN and galaxies
D. Grupe
X-ray transience is the most extreme form of variability observed in AGN or normal in-active galaxies. While factors of 2-3 on timescales of days to years are quite commen among AG…
The enigmatic soft X-ray NLS1 RX J0134.2-4258
D. Grupe, K. M. Leighly, H. -C. Thomas +1
We report the discovery and analysis of the follow-up ROSAT pointed observation, an ASCA observation and optical and radio observations of the enigmatic Narrow-Line Seyfert 1 galax…
1E 0117.2-2837 and the NLR of Narrow-Line Seyfert 1 galaxies
S. Komossa, D. Grupe, M. Janek
Based on photoionization calculations we present a study of the NLR emission line ratios of Narrow-line Seyfert 1 (NLS1) galaxies. In particular, we investigate the influence of di…
The enigmatic Soft X-ray AGN RX J0134.2--4258
D. Grupe, K. M. Leighly, H. -C. Thomas +1
We report the discovery and analysis of the follow-up ROSAT pointed observation, an ASCA observation and optical and radio observations of the enigmatic soft X-ray AGN RX J0134.2-4…