The RATAN-600 Multi-Frequency Catalogue of Blazars—BLcat

Multi-frequency radio spectra of the BL Lac object J0022+06, derived from the catalogue. There are 72 RATAN-600 observing epochs for the object from 2006.07 to 2021.01 (colored). The external radio data are shown by the grey circles.

Sotnikova Yu. V.; Mufakharov T. V.; Mingaliev M. G.; Udovitskiy R. Y.; Semenova T. A.; Erkenov A. K.; Bursov N. N.; Mikhailov A. G.; Cherepkova, Yu. V.

In this paper we present the RATAN-600 multi-frequency catalogue of blazars, an updated version of the BLcat: the RATAN-600 multi-frequency catalogue of BL Lacertae objects. The main novelty in the catalogue is an extension of the sample with flat-spectrum radio quasars (FSRQs), thus currently it contains more than 1700 blazars of different types. The main feature of the BLcat is a compilation of radio continuum data for blazars based on the RATAN-600 quasi-simultaneous measurements at frequencies of 1.2, 2.3, 4.7, 7.7/8.2, 11.2, and 21.7/22.3 GHz. We additionally supplement the catalogue with the radio data from external sources to provide an opportunity to more complete study of radio spectra and radio light curves. For the convenience of users, we developed tools to calculate the spectral index, variability index, and radio luminosity. We briefly describe basic radio properties of blazar subsamples of the catalogue: spectral classification, spectral indices, flux density variability, and radio luminosity.