ROSAT and SDSS DR7 Galaxy Clusters with X-ray Luminosities

A catalog of 64,646 candidate galaxy clusters with masses greater than ~10^13 solar masses, derived from the Sloan Digital Sky Survey Data Release 7. The authors used an optical to X-ray code to estimate X-ray luminosities from ROSAT All-Sky Survey images, with 34,522 clusters having a signal-to-noise ratio greater than 0. The dataset was last updated on 2026-03 13 and is hosted by the National Aeronautics and Space Administration.

Use Cases

• Correlating X-ray luminosity with stellar mass and halo mass based on the described properties.
• Investigating the spatial offset between the most massive galaxy and X-ray flux peak for clusters.
• Analyzing the fraction of red satellite and central galaxies relative to X-ray brightness and halo mass.
• Comparing populations of low-mass satellite galaxies in strong versus weak X-ray emitting clusters.

Strengths

• Contains X-ray luminosity estimates for 64,646 galaxy clusters.
• Includes 817 clusters with a high signal-to-noise ratio (S/N > 3) for X-ray detections.
• Links optical properties from SDSS DR7 with X-ray data from ROSAT.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.

Provenance

Source

National Aeronautics and Space Administration

Collection Method

Optical clusters identified from SDSS DR7, with X-ray luminosities estimated from ROSAT All-Sky Survey images using a custom optical to X-ray code.

Time Range

Based on SDSS Data Release 7 and ROSAT survey data.

Freshness

Last updated 2026-03-13 18:22:14.803299; freshness should be verified.

Geography

All-sky survey data.