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#1 Federal
Einstein Survey of Optically Selected Galaxies
- Organization: National Aeronautics and Space Administration
- Dataset Last Updated: November 03, 2026
The Einstein Survey of Optically Selected Galaxies contains the results of a complete Einstein Imaging Proportional Counter (IPC) X-ray survey of optically-selected galaxies from the Shapley-Ames...
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Search relevance: 343.89 | Views last month: 3 | Catalog Last Checked: November 03, 2026 at 11:50 PM
#2 Federal
ROSAT PSPC Catalog of Clusters of Galaxies
- Organization: National Aeronautics and Space Administration
- Dataset Last Updated: November 03, 2026
This is a catalog of 203 clusters of galaxies serendipitously detected in 647 ROSAT PSPC high Galactic latitude pointings covering 158 square degrees. This is one of the largest X-ray-selected...
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Search relevance: 68.02 | Views last month: 5 | Catalog Last Checked: November 03, 2026 at 11:49 PM

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