Orion Nebula Cluster: 742 X-Ray Point Sources from Chandra HRC Observation

The Orion Nebula Cluster region was observed by the Chandra X-Ray Observatory's HRC instrument for 63.2 ks on 2000 February 4. This dataset contains 742 X-ray point source detections within a 30' x 30' field of view, compiled by NASA HEASARC in March 2007 from a published multi-wavelength catalog of nearly 2900 objects.

Use Cases

• Correlating X-ray luminosity (L_X) with stellar mass based on the optical sample analysis described.
• Studying the relationship between X-ray activity and other stellar parameters (L_X/L_bol) as mentioned for the companion paper.
• Identifying low-mass ONC members from X-ray detections, as the description states sources are primarily such members.
• Assessing field object contamination in the Orion Nebula Cluster using the defined infrared and optical reference samples.
• Cross-matching X-ray sources with optical and infrared catalogs from the compiled multi-wavelength database.

Strengths

• Integrates data from 17 different catalogs, creating a multi-wavelength reference of nearly 2900 objects.
• Provides 742 X-ray detections from a dedicated 63.2 ks Chandra observation.
• Defines two reference samples (infrared and optical) to characterize membership and contamination.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count for the full multi-wavelength catalog is not specified in the provided metadata.
• Data is from a single observation epoch in 2000; temporal analysis is not possible.

Provenance

Source

National Aeronautics and Space Administration (NASA HEASARC)

Collection Method

Analysis of a Chandra HRC-I observation, combined with cross-matching from 17 published catalogs.

Time Range

Observation date: 2000 February 4.

Freshness

Last updated 2026-03-13 16:48:30.828515; freshness should be verified.

Geography

Pointing centered on the Trapezium region in the Orion Nebula Cluster (R.A. = 5h 35m 17s, DE=-5° 23' 16").