Hewitt & Burbidge (1991) Catalog of 935 Extragalactic Emission-Line Galaxies
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Description
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).
License is listed as 'other-license-specified'; terms should be reviewed before use.