M 31 Disk Chandra PHAT Survey: 373 X-Ray Sources with Optical Counterparts

373 X-ray sources were detected in the M 31 (Andromeda) galaxy disk from Chandra observations in October 2015. The catalog, created by NASA HEASARC in 2020, combines these X-ray data with Hubble Space Telescope imaging to identify 188 optical counterpart candidates. It includes 170 sources reported for the first time and provides associated star formation histories.

Use Cases

• Classifying X-ray source types based on optical counterpart associations mentioned in the description
• Analyzing the correlation between X-ray hardness and background galaxy matches
• Studying star formation histories around point-like X-ray source counterparts
• Cross-matching X-ray and optical catalog data for population studies

Strengths

• 373 X-ray sources detected down to a specific flux limit of 10^-15 erg/cm^2/s
• 188 sources have identified optical counterpart candidates with corrected astrometry to 0.1 arcseconds
• Includes 170 sources reported for the first time, providing new data

Limitations

• 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 (NASA HEASARC)

Collection Method

Combined deep Chandra ACIS-I X-ray observations with Hubble Space Telescope (HST) imaging from the Panchromatic Hubble Andromeda Treasury (PHAT) survey.

Time Range

Observations conducted from 2015 Oct 06 to 2015 Oct 26.

Freshness

Last updated 2026-03-13 18:47:31.947997; freshness should be verified

Geography

Focus on the disk of the M 31 (Andromeda) galaxy.