Selected Area 57: 140 X-Ray Sources from XMM-Newton Observations

A catalog of 140 X-ray sources detected by the XMM-Newton telescope during a 67 ks observation of a ~0.2 deg² field in Selected Area 57. The data, created by NASA HEASARC in September 2007, includes limiting fluxes of 5e-16 and 2e-15 erg/cm²/s in two energy bands and optical identifications for 98 sources. It was compiled to study the X-ray and optical properties of Active Galactic Nuclei, particularly low-luminosity ones.

Use Cases

• Cross-matching X-ray and optical sources based on the 98 identified counterparts.
• Analyzing the X-ray properties of low-luminosity AGNs (LLAGNs) based on the variability-selected sample.
• Studying the X-ray-to-optical flux ratio (X/O) distribution, noted for 15% of QSOs having X/O < 0.1.
• Investigating the evolutionary behavior of AGN number density across redshifts as referenced in the description.

Strengths

• Contains 140 X-ray sources with specific limiting flux thresholds in two energy bands.
• Includes optical identifications and likely counterpart information for 98 of the sources.
• Data is sourced from a dedicated XMM-Newton observation and correlated with a complete photographic survey.

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 19:18:03.197656; freshness should be verified.

Provenance

Source

NASA HEASARC, based on CDS table J/A+A/469/1211.

Collection Method

X-ray data from a 67 ks XMM-Newton observation correlated with an optical photographic and spectroscopic survey.

Time Range

Observation date not specified; catalog created September 2007.

Freshness

Last updated 2026-03-13 19:18:03.197656.

Geography

Selected Area 57, a ~0.2 deg² field in the sky.