NGC 6530: Chandra X-Ray Point Source Catalog for a Young Stellar Cluster

A deep 60 ks Chandra ACIS-I X-ray observation of the young (~1.5-2.0 Myr) cluster NGC 6530 on 2001 Jun 18-19 detected 884 X-ray point sources. The authors, from the National Aeronautics and Space Administration, argue 90%-95% are pre-main-sequence cluster members, significantly enlarging the known stellar population. The catalog includes cross-matches to 220 optical and 731 infrared (2MASS) counterparts.

Use Cases

• Identify pre-main-sequence stars in NGC 6530 based on X-ray detection and cross-matched optical/IR data.
• Study the stellar population and mass distribution of a young cluster using the 884 point sources.
• Analyze positional accuracy and spurious match rates in multi-wavelength catalog cross-matching.
• Model stellar evolution by placing optically identified X-ray sources on the Hertzsprung-Russell diagram.

Strengths

• Contains 884 X-ray point sources from a deep 60 ks Chandra observation.
• Includes cross-matches to 220 optical and 731 infrared (2MASS) counterparts.
• Provides detailed positional matching methodology and error estimates.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• The authors estimate up to 28 of the 220 optical identifications may be spurious.
• The optical reference catalog does not cover the easternmost 2.25' of the field, affecting 46 X-ray sources.

Provenance

Source

National Aeronautics and Space Administration

Collection Method

Data gathered from a deep 60 ks Chandra ACIS-I X-ray observation on 2001 Jun 18 19.

Time Range

Observation date: 2001 Jun 18-19.

Freshness

Last updated 2026-03-13 19:40:55.470945; freshness should be verified.

Geography

Pointing centered on NGC 6530 cluster at RA = 18^h 04^m 24.38^s, Dec = -24^o 21' 05.8" (J2000.0).