XMM-Newton CFHTLS W1 Field: Catalog of 128 X-ray Galaxy Groups

A 2.276 x 2.276 square degree area of the CFHTLS W1 field overlapping XMM-Newton observations contains a catalog of 128 X-ray galaxy groups. The catalog, created by NASA HEASARC in December 2014, covers a redshift range of 0.04 to 1.23 and was used to study the evolution of the magnitude gap between brightest cluster galaxies. The data originates from the XMM-LSS survey, with optical support from CFHTLS observations conducted between 2003 and 2008.

Use Cases

• Statistical analysis of redshift evolution for the magnitude gap between brightest cluster galaxies based on the catalog's redshift and magnitude data.
• Comparative studies of fossil group fractions across redshifts based on the reported 22.2% +/- 6% fossil groups at z <= 0.6.
• Validation of semi-analytic models based on the Millennium simulation using the catalog's group properties and evolutionary trends.
• Investigation of active galactic nuclei feedback evolution at z < 1 based on the described trend in the magnitude-brightness relation.

Strengths

• Contains 128 galaxy groups, providing a statistically meaningful sample for analysis.
• Covers a wide redshift range from 0.04 to 1.23, enabling evolutionary studies.
• Based on coordinated X-ray (XMM-Newton) and optical (CFHTLS) observations, offering multi-wavelength data.

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 17:42:57.664753; freshness should be verified.

Provenance

Source

NASA HEASARC, based on CDS catalog J/A+A/566/A140.

Collection Method

X-ray observations from the XMM-Newton satellite under the XMM-LSS project, combined with optical data from the Canada-France-Hawaii Telescope Legacy Survey (CFHTLS).

Time Range

XMM-Newton observations until 2009; CFHTLS observations between 2003 and 2008.

Freshness

Catalog created in December 2014; metadata last updated in March 2026.

Geography

Covers a ~3 square degree part of the CFHTLS W1 field.