INTEGRAL IBIS AGN Catalog: 272 Active Galactic Nuclei with Optical and X-ray Data

A 272-object catalog of active galactic nuclei (AGN) compiled from the INTEGRAL satellite's IBIS instrument. The dataset includes secure optical identifications, precise spectroscopy, redshift values, and X-ray spectral information such as 2-10 keV and 20-100 keV fluxes and column densities. It was created by merging sources from the fourth INTEGRAL/IBIS survey with additional galaxies from an all-sky survey.

Use Cases

• Studying the absorption properties of active galaxies based on measured column densities and X-ray fluxes.
• Testing the AGN unification scheme by comparing optical classifications (type 1/type 2) with X-ray absorption states.
• Investigating the relationship between source luminosity and absorption to probe evolution in obscuration properties.
• Analyzing peculiar AGN classes such as X-ray bright optically normal galaxies (XBONGs), type 2 QSOs, and low-ionization nuclear emission regions.

Strengths

• Contains 272 AGN with secure optical identifications and precise spectroscopy.
• Provides measured redshift values and X-ray spectral information (2-10 keV and 20-100 keV fluxes, column densities).
• Enables analysis of absorption fractions, with 48% of the sample absorbed and ~7% Compton-thick.
• Includes analysis of outliers from the unified theory, such as 22 absorbed type 1 AGN and 10 unabsorbed type 2 AGN.

Limitations

• Row count is unknown, which may limit suitability assessment.
• Column-level documentation is absent; field semantics must be inferred after download.
• Data may reflect observational bias inherent to the INTEGRAL satellite's sky coverage and sensitivity.

Provenance

Source

National Aeronautics and Space Administration (NASA), likely via the HEASARC database.

Collection Method

Compiled from the fourth INTEGRAL/IBIS survey (Bird et al. 2010) and an updated INTEGRAL all-sky survey (Krivonos et al. 2007).

Time Range

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Freshness

Last updated 2026-03-13 20:13:58.880482; freshness should be verified.

Geography

All-sky coverage from the INTEGRAL satellite observations.