Roma-BZCAT: Multi-Frequency Catalog of 3,561 Blazars
Updated 3mo ago
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Description
A catalog of 3,561 blazars and candidate blazars, providing coordinates and multi-frequency data. The 5th edition, maintained by NASA HEASARC, includes 1,151 BZB, 1,909 BZQ, 274 BZG, and 227 BZU sources, with updates based on CDS archives. All sources have a confirmed radio band detection and, with noted exceptions, published spectroscopic information.
Use Cases
Classifying blazar types (BZB, BZQ, BZG, BZU) based on the catalog's updated classification scheme.
Cross-matching radio sources with optical and other frequency data using the provided coordinates.
Studying the spectral properties of confirmed blazars using the referenced spectroscopic information.
Filtering catalogs to exclude 'radio quiet BL Lacs' for studies requiring confirmed radio detections.
Strengths
Contains data on 3,561 sources, about 30% more than the 1st edition.
All sources have a confirmed detection in the radio band, reducing contamination from other object types.
Provides a detailed breakdown of 1,151 BZB, 1,909 BZQ, 274 BZG, and 227 BZU sources.
Limitations
Column-level documentation is absent; field semantics must be inferred after download.
Excludes 'radio quiet BL Lacs' and some BL Lac candidates where optical spectra are unavailable, which may limit certain comparisons.
Row count is unknown, which may limit suitability assessment.
Provenance
Source
NASA HEASARC, based on CDS Catalog VII/274.
Collection Method
Catalog compilation from astronomical observations and literature.
Time Range
Catalog edition reflects data available up to its publication and updates.
Freshness
Last updated 2026-03-13 19:19:47.184848; freshness should be verified.
Geography
Celestial coordinates (J2000) for extragalactic sources.
License is listed as 'other-license-specified'; terms should be reviewed before use.