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arxiv: astro-ph/0003219 · v2 · submitted 2000-03-15 · 🌌 astro-ph

The Northern ROSAT All-Sky (NORAS) Galaxy Cluster Survey I: X-ray Properties of Clusters Detected as Extended X-ray Sources

H. Boehringer , W. Voges , J.P. Huchra , B. McLean , R. Giacconi , P. Rosati , R. Burg , J. Mader
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P. Schuecker D. Simic S. Komossa T.H. Reiprich J. Retzlaff J. Truemper
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keywords x-raysourcesclusterssampleall-skyextendedgalaxyrosat
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In the construction of an X-ray selected sample of galaxy clusters for cosmological studies, we have assembled a sample of 495 X-ray sources found to show extended X-ray emission in the first processing of the ROSAT All-Sky Survey. The sample covers the celestial region with declination $\delta \ge 0\deg $ and galactic latitude $|b_{II}| \ge 20\deg $ and comprises sources with a count rate $\ge 0.06$ counts s$^{-1}$ and a source extent likelihood of 7. In an optical follow-up identification program we find 378 (76%) of these sources to be clusters of galaxies. ...

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