Hewitt & Burbidge (1991) Catalog of 935 Extragalactic Emission-Line Galaxies

935 galaxies with optical properties similar to Quasi-Stellar Objects, compiled by Hewitt and Burbidge in 1991. The catalog was created by NASA's HEASARC in February 2001 based on the CDS/ADC Catalog VII/178. Most objects are nonstellar, with over 700 having redshifts z <= 0.2, and are classified as Seyfert galaxies, N systems, or radio galaxies.

Use Cases

• Analyze the redshift distribution of emission-line galaxies based on the described peaks at z ~ 0.025 and z = 0.06.
• Study populations of Seyfert galaxies, N systems, and radio galaxies based on the described classifications.
• Investigate the properties of powerful radio galaxies based on the described extended tail of the distribution with z > 0.2.
• Compare this catalog of nonstellar objects with QSO databases to understand selection criteria for emission-line objects.

Strengths

• Contains 935 cataloged galaxies, providing a substantial sample for analysis.
• Over 700 objects have redshifts z <= 0.2, offering a focus on relatively nearby galaxies.
• The catalog explicitly excludes star-like objects with emission-line redshifts >= 0.1, LINERs, and starburst galaxies, providing a clear scope.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• The catalog is based on 1991 research; newer discoveries are not included.

Provenance

Source

National Aeronautics and Space Administration (NASA HEASARC), based on CDS/ADC Catalog VII/178.

Collection Method

Compilation of an optical catalog from astronomical observations.

Time Range

Catalog publication year is 1991.

Freshness

Last updated 2026-03-13 18:45:35.080050; freshness should be verified.

Geography

Extragalactic (non-Milky Way).