The Northern ROSAT All-Sky (NORAS) Galaxy Cluster Survey. 1. X-ray properties of clusters detected as extended x-ray sources

Mar, 2000
61 pages
Published in:
  • Astrophys.J.Suppl. 129 (2000) 435-474
e-Print:

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Abstract: (arXiv)
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 δ0deg\delta \ge 0\deg and galactic latitude bII20deg|b_{II}| \ge 20\deg and comprises sources with a count rate 0.06\ge 0.06 counts s1^{-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. ...