M71 Chandra X-Ray and Optical/Infrared Counterparts Catalog

63 X-ray sources from a 52.4 ks Chandra observation of the globular cluster M71, conducted on 2004 December 20-21. The catalog includes 5 sources within the cluster core and 29 within the half-mass radius, with a limiting luminosity of 1.5e30 ergs/s. The data was produced by NASA and includes results from ground-based optical counterpart searches.

Use Cases

• Analyzing the radial distribution of X-ray sources based on the reported 18 +/- 6 sources associated with M71.
• Studying the spectra and variability of faint X-ray populations as described in the source paper.
• Identifying optical and infrared counterparts for X-ray point sources to understand their nature.
• Comparing X-ray source luminosity functions in the range 1e30-1e31 ergs/s across different globular clusters.

Strengths

• Includes 63 X-ray sources with associated optical/infrared counterpart information where available.
• Based on a 52.4 ks observation from the Chandra X-Ray Observatory's Advanced CCD Imaging Spectrometer.
• Provides specific detection thresholds and sensitivity limits (e.g., ~4.9 counts within 2r_h).

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data may reflect observational bias inherent to the specific Chandra instrument and observation parameters.

Provenance

Source

National Aeronautics and Space Administration

Collection Method

Observation from the Chandra X-Ray Observatory (ObsID 5434) using the ACIS in very faint, timed-exposure mode.

Time Range

Observation date: 2004 December 20-21.

Freshness

Last updated 2026-03-13 16:26:20.358694; freshness should be verified.

Geography

Globular cluster M71 (NGC 6838), centered at J2000.0 RA 19 53 46.1, Dec +18 46 42.