M 31 Bulge Chandra X-Ray Point Source Catalog with 263 Sources

NASA HEASARC provides a catalog of 263 X-ray point sources in the bulge of the Andromeda galaxy (M 31), created in March 2010. The data originates from 26 archival Chandra ACIS observations within 12 arcminutes of the galactic center, with a limiting luminosity of ~10^35 erg s^-1. The study contrasts subpopulations like persistent and transient sources and primordial versus dynamically formed low-mass X-ray binaries (LMXBs).

Use Cases

• Contrasting properties of persistent and transient X-ray sources based on the subpopulation classifications mentioned.
• Analyzing the spatial distribution of X-ray sources relative to K-band light or stellar density profiles.
• Modeling luminosity functions for low-mass X-ray binaries (LMXBs) based on the described flattening below ~10^37 erg s^-1.
• Investigating the dynamical formation of sources in globular clusters and the galactic center based on radial distribution analysis.
• Identifying and studying transient sources that varied by a factor larger than 20.

Strengths

• Contains 263 identified X-ray point sources with a defined limiting luminosity of ~10^35 erg s^-1.
• Based on 26 archival Chandra ACIS observations, providing a multi-observation dataset.
• Includes analysis of distinct subpopulations such as 28 identified transient sources.

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 2010; freshness should be verified for contemporary research needs.

Provenance

Source

National Aeronautics and Space Administration (NASA HEASARC), based on CDS catalog J/A+A/468/49.

Collection Method

Analysis of 26 archival Chandra ACIS observations with aim-points within 10 arcminutes of M 31's center.

Time Range

Observational timeframe not specified; catalog created in March 2010.

Freshness

Last updated 2026-03-13 18:03:59.136720; freshness should be verified.

Geography

Spatial coverage within 12 arcminutes from the center of the Andromeda galaxy (M 31).