M 33 Chandra X-Ray Point Source Catalog: 261 Detected Sources

M 33, a Local Group galaxy, is the subject of this catalog containing 261 X-ray point sources detected by NASA's Chandra observatory across three observations. The data includes sources down to a flux limit of 3 x 10^-16 erg/s/cm^2 and covers an area of about 0.2 square degrees. This table was created by the NASA HEASARC in December 2005 based on research published by Grimm et al.

Use Cases

• Constructing X-ray luminosity functions based on the provided flux and luminosity data.
• Analyzing the population of young stellar objects based on X-ray color analysis and optical counterpart information.
• Comparing X-ray source populations in M 33 with other star-forming galaxies.
• Identifying potential low-mass X-ray binary candidates using hardness ratio diagram analysis.

Strengths

• Contains 261 distinct X-ray sources detected down to a specific flux limit of 3 x 10^-16 erg/s/cm^2.
• Data is derived from three separate, targeted Chandra observations centered on the nucleus and the NGC 604 region.
• Luminosity functions have been constructed and are noted as consistent with other star-forming galaxies.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• The table contains 783 entries because each of the 261 sources has three entries, which may require deduplication for certain analyses.
• Last updated 2026-03-13 17:19:59.967775; freshness should be verified.

Provenance

Source

NASA HEASARC, based on data from Chandra observations (obsids 786, 1730, 2023) and Grimm et al. (2005).

Collection Method

Compiled from a machine-readable version of a published astrophysical journal table.

Freshness

Last updated 2026-03-13 17:19:59.967775.

Geography

The Local Group galaxy M 33 (Triangulum Galaxy).