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astro-ph1999
Clusters of Galaxies: Multifrequency Observations versus Theories
Sabine Schindler
Clusters of galaxies are large gravitationally bound systems which consist of several observable components: hundreds of galaxies, hot gas between the galaxies and sometimes relati…
astro-ph1999
Distant clusters of galaxies: X-ray properties and their relations
Sabine Schindler
We investigate the evolution of clusters of galaxies in a sample of distant clusters with redshifts between 0.3 and 1.0. We show the abilities and limitations of combined ROSAT and…
astro-ph1999
The Gravitationally Lensed Quasar Q2237+0305 in X-rays: ROSAT/HRI Detection of the "Einstein Cross"
Joachim Wambsganss, Hermann Brunner, Sabine Schindler +1
We report the first detection of the gravitationally lensed quasar Q2237+0305 in X-rays. With a ROSAT/HRI exposure of 53 ksec taken in Nov./Dec. 1997, we found a count rate of 0.00…