Groth-Westphal Strip Chandra X-Ray Point Source Catalog with Optical Properties

NASA HEASARC provides a catalog of 158 distinct X-ray point sources detected in a 200-ks Chandra observation of the Groth-Westphal Strip region. The table merges optical and X-ray spectral properties, with optical data primarily from the DEEP2 survey and the Canada-France-Hawaii Telescope Legacy Survey. This catalog was created in July 2007 based on source data from observations conducted in August 2002.

Use Cases

• Cross-match X-ray and optical source properties based on the merged spectral data.
• Analyze X-ray source number counts and spatial distribution in a specific extragalactic field.
• Study the completeness of optical identifications and redshift determinations for a 2-10 keV selected sample.
• Benchmark point-source detection methods and limiting sensitivity calculations against the described methodology.

Strengths

• Contains 158 distinct X-ray sources detected with a threshold Poisson detection probability of 4 x 10^-6.
• Focuses on a 97-source, 2-10 keV selected sample with an 86% optical identification rate and 63% redshift determination fraction.
• Integrates a wealth of optical photometric and spectroscopic data from major surveys like DEEP2 and CFHTLS.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data is from 2002 observations and was compiled in 2007; newer observations may exist.

Provenance

Source

National Aeronautics and Space Administration (NASA HEASARC)

Collection Method

Merged from CDS Catalogs J/MNRAS/356/568 and J/MNRAS/371/221, based on Chandra ACIS-I observations.

Time Range

Observations conducted between 2002 August 11 and 22.

Freshness

Last updated 2026-03-13 17:49:09.703476; freshness should be verified.

Geography

Covers the Groth-Westphal Strip (GWS) region, part of the Extended Groth Strip (EGS).