Akari NEP Deep Field: 457 Chandra X-Ray Point Sources

457 X-ray sources detected in a 300-ks Chandra survey of the AKARI North Ecliptic Pole deep field, covering 0.34 square degrees. The catalog, produced by NASA, includes photometry and flux limits in multiple energy bands and is designed for high reliability with an estimated ~1.7% spurious fraction. Among 377 sources in the central region with deep Subaru imaging, ~80% have optical counterparts and ~60% have AKARI mid-IR counterparts.

Use Cases

• Identify X-ray emitting objects and their multi-wavelength counterparts based on the joint detection procedure.
• Study mid-infrared-selected AGN populations at redshift z~1 based on the unique 9-band infrared photometry.
• Analyze source reliability and completeness trade-offs for low-count objects based on the catalog's design.
• Cross-match X-ray sources with existing infrared AGN catalogs based on the described procedure.

Strengths

• High reliability with an estimated spurious source detection rate of ~1.7%.
• Unique mid-infrared coverage from AKARI, including bands not covered by Spitzer, over a 0.34 square degree field.
• Includes Bayesian-based 90%-confidence upper flux limits and sensitivity maps for multiple X-ray energy bands.

Limitations

• Catalog sacrifices completeness for objects with low counts to achieve high reliability.
• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.

Provenance

Source

National Aeronautics and Space Administration

Collection Method

Results from a 300-ks Chandra survey, with source detection via joint Maximum Likelihood PSF fits on 15 mosaicked pointings.

Time Range

null

Freshness

Last updated 2026-03-13 17:23:19.057140; freshness should be verified.

Geography

AKARI North Ecliptic Pole deep field (0.34 square degrees, with central 0.25 square degrees having deep Subaru imaging)