NGC 4365 Chandra LMXB Catalog: 99 X-ray Sources

NASA's Chandra X-Ray Observatory imaged the elliptical galaxy NGC 4365 on 2001 June 23 for a live exposure of 40429 seconds. The HEASARC created this table in June 2018, presenting 99 resolved X-ray sources, most identified as low-mass X-ray binaries associated with the galaxy.

Use Cases

• Classifying X-ray source types based on the defined hardness ratios HR21 and HR31.
• Analyzing the spatial distribution of LMXBs relative to the galaxy's effective radius.
• Correlating X-ray sources with optical counterparts, such as the 18 sources identified with globular clusters.
• Studying the composition of X-ray emission (resolved sources, unresolved LMXBs, diffuse gas) within a galactic region.

Strengths

• Observation details are precisely documented, including a 40429-second live exposure time and observation date.
• Source catalog is resolved, listing 99 individual X-ray sources for NGC 4365.
• Emission components are quantified: 45% resolved sources, 30% unresolved LMXBs, and 25% diffuse gas within one effective radius.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data is specific to a single observation from 2001; temporal coverage is limited.

Provenance

Source

National Aeronautics and Space Administration (NASA), HEASARC

Collection Method

Imaging from the Chandra X-Ray Observatory ACIS-S3 instrument.

Time Range

Observation date 2001-06-23.

Freshness

Last updated 2026-03-13 18:07:17.305583; freshness should be verified.

Geography

Elliptical galaxy NGC 4365.