Abell Clusters: Measured Redshifts for 992 Galaxy Clusters

1059 published redshifts were found for clusters from the all-sky ACO Catalog of 4073 rich and 1175 southern poor clusters. The HEASARC created this table in May 2010 based on the CDS Catalog VII/165A, providing a service by NASA. Redshifts for rich clusters are now virtually complete out to z=0.05 in the north and z=0.04 in the south.

Use Cases

• Calibrate magnitude-redshift (m_10 - z) relations for southern clusters based on suggested adjustments mentioned in the description.
• Study foreground contamination in cluster redshifts based on the quality classifications applied to the data.
• Compare redshift estimates for S-clusters, which are noted to be about 30 percent lower than previously estimated.
• Analyze the completeness of redshift data for rich clusters in northern and southern hemispheres as described.

Strengths

• Contains 992 entries with measured redshifts, representing a 21 percent increase over the original ACO catalog.
• Redshifts for rich clusters are described as virtually complete out to specific redshift limits (z=0.05 north, z=0.04 south).
• Data includes quality classifications intended to reduce foreground contamination issues.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Last updated 2026-03-13 19:48:41.925793; freshness should be verified.

Provenance

Source

NASA HEASARC, based on CDS Catalog VII/165A.

Collection Method

Search of published redshifts for clusters from the ACO (Abell, Corwin and Olowin 1989) Catalog.

Time Range

Catalog data from 1989, with redshifts compiled from subsequent publications.

Freshness

Last updated 2026-03-13 19:48:41.925793

Geography

All-sky coverage (northern and southern hemispheres).