SEXSI/Spitzer AGN Catalog: 290 Hard X-Ray Sources with Mid-IR Photometry

290 hard X-ray-selected sources from the SEXSI program with matched mid-infrared photometry from Spitzer IRAC and MIPS observations. The catalog was created by NASA HEASARC in March 2012 based on published research comparing AGN selection methods across X-ray and infrared wavelengths. The data originates from six fields with deep Chandra X-ray images, optical imaging, and extensive optical spectroscopy.

Use Cases

• Compare AGN selection efficiency based on X-ray luminosity versus mid-infrared color selection techniques described in the study.
• Analyze the correlation between X-ray detection and mid-infrared colors for AGN candidates.
• Train models to identify AGN activity using combined X-ray and infrared photometric data.
• Study the properties of luminous X-ray sources that also exhibit mid-infrared AGN signatures.

Strengths

• Contains photometric data for 290 hard X-ray-selected sources, providing a substantial sample for analysis.
• Multi-wavelength data includes four IRAC bands (3.6, 4.5, 5.8, 8.0 µm) and MIPS 24 µm imaging.
• False match rates for source cross-matching are quantified, with rates as low as <1% for four-band IRAC detections.
• Based on published research in the Astrophysical Journal, indicating peer-reviewed provenance.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data was created in 2012; freshness should be verified for contemporary research needs.

Provenance

Source

National Aeronautics and Space Administration (NASA HEASARC)

Collection Method

Photometric data from targeted and archival Spitzer programs (IRAC and MIPS) matched to X-ray source positions from the SEXSI program.

Time Range

Observations likely span the operational periods of Chandra and Spitzer telescopes; specific years not provided.

Freshness

Last updated 2026-03-13 20:02:43.521294; freshness should be verified.

Geography

Extragalactic; covers six specific astronomical fields observed by Chandra and Spitzer.