COSMOS X-ray Group Catalog: 247 Galaxy Groups in a 2-Square-Degree Field

A revised catalog of 247 X-ray groups of galaxies identified in the 2 square degree COSMOS field. The groups have masses between 8x10^12 and 3x10^14 solar masses and span a redshift range of 0.08 to 1.53. The catalog was produced by Gozaliasl in 2019 using combined XMM-Newton and Chandra data and incorporates photometric and spectroscopic redshifts from the COSMOS2015 project.

Use Cases

• Study the mass distribution of galaxy groups based on X-ray luminosity and mass estimates.
• Analyze galaxy group evolution across cosmic time based on the redshift range of 0.08 to 1.53.
• Validate cosmological models using the spatial distribution of groups in the 2 square degree COSMOS field.
• Cross-match X-ray group centers with optical and infrared data from the COSMOS survey.

Strengths

• Contains 247 distinct galaxy groups, providing a substantial sample for statistical analysis.
• Covers a wide redshift range (0.08 <= z < 1.53), enabling studies of evolution over cosmic time.
• Uses combined data from two major X-ray observatories (XMM-Newton and Chandra) for center determination.
• Incorporates both photometric and spectroscopic redshift references for improved accuracy.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment for specific modeling tasks.
• Description metadata is limited; actual data quality requires manual inspection after download.

Provenance

Source

National Aeronautics and Space Administration (NASA)

Collection Method

Compiled from combined XMM-Newton and Chandra X-ray observations and the COSMOS2015 photometric/spectroscopic redshift catalogs.

Freshness

Last updated 2026-03-13 19:30:36.626952; freshness should be verified.

Geography

Covers the 2 square degree COSMOS field.