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24 papers · 2 filters
A spectral study of gamma-ray emitting AGN
Martin Pohl
In this paper I investigate the -ray spectra of AGN by summing up the intensity and the power-law fit statistic of Quasars and OVV's and BL Lac's separately. The spectrum of the…
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…
The UV/X-ray emission of the symbiotic star AG Draconis during quiescence and the 1994/1995 outbursts
J. Greiner, K. Bickert, R. Luthardt +4
We present the results of an extensive campaign of coordinated X-ray (ROSAT) and UV (IUE) observations of the symbiotic star AG Dra during a long period of quiescence (1990-1993) f…
Measuring Omega
Avishai Dekel, David Burstein, Simon D. M. White
We were asked to debate the value of the cosmological mass-density parameter Omega. Is Omega_m=1 in accordance with the simplest model? Is Omega_m much smaller as indicated by some…
Do dwarf spheroidal galaxies contain dark matter?
A. Burkert
The amount of dark matter in the four galactic dwarf spheroidals with large mass-to-light ratios is investigated. Sextans has a cut-off radius which is equal to the expected tidal…
Search for correlations between COBE DMR and ROSAT PSPC All-Sky survey data
R. Kneissl, R. Egger, G. Hasinger +2
Results from a cross-correlation analysis between the COBE DMR 4 year, and ROSAT PSPC All-Sky Survey data are presented. Statistical comparisons between microwave and X-ray maps ca…