M 81 Chandra X-Ray Source Catalog: 177 Detected Objects
Updated 2mo ago
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Description
177 X-ray sources detected in the nearby Sab galaxy M 81 by the Chandra X-Ray Observatory. The catalog includes source positions, count rates, luminosities, and counterpart identifications, with spectral analysis for the 36 brightest objects. NASA HEASARC created this table in March 2007 based on a 49926-second observation from May 2000.
Use Cases
Classifying X-ray source populations in a nearby galaxy based on detected positions and luminosities.
Studying the spectral properties of bright sources like the low-luminosity AGN and SN 1993J.
Cross-matching X-ray sources with optical counterparts using the provided limiting magnitudes and identifications.
Analyzing the spatial distribution of sources within the D_25 isophote of M 81.
Strengths
Data originates from the Chandra X-Ray Observatory, a premier space telescope.
Catalog includes 177 detected sources with 124 located within the D_25 isophote.
Provides specific observational details, including a 49926-second exposure and a limiting luminosity of ~3e36 erg/s.
Limitations
Column-level documentation is absent; field semantics must be inferred after download.
Row count is unknown, which may limit suitability assessment.
Last updated 2026-03-13 18:43:25.986970; freshness should be verified.
Provenance
Source
NASA HEASARC, based on CDS table J/ApJS/144/213.
Collection Method
Reprocessed X-ray data from a Chandra ACIS-S imaging observation.
Time Range
Primary observation on 2000 May 7.
Freshness
Last updated 2026-03 13 18:43:25.986970; freshness should be verified.
Geography
Targets the Sab galaxy M 81 (NGC 3031), located 3.6 Mpc away.
License is listed as 'other-license-specified'; terms should be reviewed before use.