Chandra ACIS Survey of 719 Nearby Galaxies for X-Ray AGN

719 galaxies within 50 megaparsecs were surveyed using Chandra X-ray Observatory data as of March 2016. The survey identified 314 X-ray active galactic nuclei, with a typical photon index of around 1.8. This table was created by the HEASARC in September 2017 based on catalog files from the CDS.

Use Cases

• Classifying galaxy types based on AGN fraction differences between elliptical and spiral galaxies.
• Modeling X-ray spectra of AGNs based on the described single power-law model with interstellar absorption.
• Studying the correlation between AGN presence and star-forming regions like H II nuclei.
• Comparing optical and X-ray AGN detection methods for finding weak AGNs.

Strengths

• Sample of 719 galaxies provides a substantial base for statistical analysis.
• 314 identified X-ray AGNs offer a focused subset for detailed study.
• Nuclear positions prioritized from near-infrared data to reduce dust obscuration effects.
• Distances sourced from NASA/IPAC Extragalactic Database using multiple established methods.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data is based on observations available as of March 2016; newer observations are not included.

Provenance

Source

National Aeronautics and Space Administration (NASA), HEASARC

Collection Method

Assembled from public Chandra/ACIS archive observations cross-correlated with the NASA/IPAC Extragalactic Database.

Time Range

Observations publicly available as of March 2016.

Freshness

Last updated 2026-03-13 17:49:04.765793; freshness should be verified.

Geography

Galaxies within 50 megaparsecs of Earth.