NGC 1893: Chandra X-Ray Catalog of 1021 Stellar Sources

NASA HEASARC provides a catalog of 1021 X-ray sources detected in the outer Galaxy star cluster NGC 1893, located at a galactic radius greater than or equal to 11 kiloparsecs. The data was created in March 2012 based on five deep Chandra ACIS-I observations totaling 450 ks of exposure time. It includes derived X-ray luminosities, variability assessments, and classifications for Class II and Class III stellar members.

Use Cases

• Comparing X-ray luminosity functions between outer Galaxy and solar neighborhood star-forming regions based on the derived luminosity range.
• Investigating the correlation between stellar disk presence and X-ray brightness using the Class II and Class III member classifications.
• Analyzing stellar flare activity and variability using the provided Kolmogorov-Smirnov test results and flare rate statistics.
• Estimating distances to young stellar clusters using the described universal properties of the X-ray luminosity function.

Strengths

• Contains 1021 distinct X-ray sources, providing a substantial sample for statistical analysis.
• Based on 450 ks of total exposure time from five deep Chandra observations, suggesting detailed signal capture.
• Includes derived physical properties like X-ray luminosities in the range 10^29.5 to 10^31.5 erg s^-1 and variability flags for 34% of sources.

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 17:22:53.789193; freshness should be verified.

Provenance

Source

NASA HEASARC, based on CDS Catalog J/A+A/539/A74.

Collection Method

Source events extracted from Chandra ACIS-I observations using the IDL-based routine ACIS-Extract, with spectral fitting and quantile analysis.

Time Range

Observations cover the young cluster NGC 1893, estimated to be 1-2 million years old.

Freshness

Catalog created March 2012; metadata last updated March 2026.

Geography

Covers the star cluster NGC 1893 in the outer part of the Galaxy (galactic radius >= 11 kpc).