NGC 2403 Chandra X-Ray Point Source Catalog with 190 Sources

NASA HEASARC provides a catalog of 190 high-significance X-ray point sources in the galaxy NGC 2403, part of the Chandra Local Volume Survey. The data originates from five Chandra ACIS-S observations totaling 190 ks of exposure time, processed in September 2015. The catalog includes sources down to a limiting luminosity of ~5e35 erg/s and provides cross-correlations with optical data for preliminary source classification.

Use Cases

• Classifying X-ray sources as binaries, AGN, supernova remnants, or foreground stars based on cross-correlations with Hubble Space Telescope data.
• Analyzing X-ray hardness ratios and spectral properties across nine defined energy bands.
• Studying the radial distribution of X-ray point sources within the NGC 2403 galaxy.
• Investigating temporal variability of high-significance X-ray sources.
• Integrating source data into the broader Chandra Local Volume Survey, which contains 629 sources across five galaxies.

Strengths

• Contains 190 high-significance sources with a strict statistical threshold (pns < 4e-6).
• Based on 190 ks of combined, calibrated Chandra X-ray Observatory observations.
• Sources are cross-correlated with multi-wavelength datasets, including Hubble Space Telescope data, for classification.
• Part of a larger, consistent survey (CLVS) totaling 629 sources across five galaxies.

Limitations

• Excludes 108 lower-significance sources (4e-6 < pns < 1e-3) that may be genuine.
• 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

Archival X-ray observations from the Chandra X-Ray Observatory, processed using ACIS-Extract and wavdetect source detection.

Time Range

Observations from April 2001 to December 2004.

Freshness

Last updated 2026-03-13 17:02:29.989340; freshness should be verified.

Geography

The galaxy NGC 2403, an outlying member of the M81 group.