M 101 Chandra X-Ray Point Source Catalog: 110 Sources from a Deep Observation
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Description
NASA HEASARC provides a catalog of 110 discrete X-ray sources detected with greater than 3-sigma significance from a deep 98.2ks Chandra observation of the face-on spiral galaxy M 101. The catalog, created in July 2007, includes sources likely to be X-ray binaries, supersoft sources, and supernova remnants, with only approximately 27 expected to be background sources. The 29 brightest sources have sufficient flux for crude spectral modeling, with most fitted by a power-law and eight soft sources by a blackbody model.
Use Cases
Classifying X-ray source types (e.g., binaries, supernova remnants) based on luminosity and spectral model fits mentioned in the description.
Analyzing the spatial correlation of X-ray sources with galactic spiral arms as noted in the description.
Performing spectral analysis on the 29 brightest sources using power-law or blackbody models as described.
Estimating background source contamination in extragalactic X-ray surveys based on the stated ~27 likely background objects.
Strengths
Based on a deep 98.2 kilosecond observation from the Chandra X-ray Observatory.
Catalog contains 110 sources detected with a significance threshold greater than 3-sigma.
Includes spectral model information for the 29 brightest sources (greater than 100 counts).
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 2007; freshness should be verified for current research.
Provenance
Source
National Aeronautics and Space Administration (NASA HEASARC)
Collection Method
Created based on CDS Catalog J/ApJ/561/189 files table1.dat and table4.dat from Chandra Cycle 1 observation.
Time Range
Observation date not specified; catalog created July 2007.
Freshness
Last updated 2026-03-13 18:49:05.082547; freshness should be verified.
Geography
Covers the nearby face-on spiral galaxy M 101 at a distance of 7.2 Mpc.
License is listed as 'other-license-specified'; terms should be reviewed before use.