The ROSAT All-Sky-Survey

In the ROSAT Survey, the entire sky was mapped and sources were visible a hundred times fainter than in any previous survey. Altogether, 150,000 X-ray sources were discovered with ROSAT, twenty-five times more than with all previous X-ray satellites together. In the survey with its unlimited field of view, regions of diffuse X-ray emission, for instance from the supernova remnants and clusters of galaxies, were reproduced and spectroscopally analyzed for the first time. The ROSAT All-Sky Survey Bright Source Catalogue (RASS-BSC) was derived from the all-sky survey containing 18,811 sources with a limiting ROSAT PSPC count rate of 0.05 counts/s.

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