RATAN-600 multi-frequency data for the BL Lac objects
M.G. Mingaliev, Yu.V. Sotnikova, R.Yu. Udovitskiy, T.V. Mufakharov, E., Nieppola, and A.K. Erkenov

TL;DR
This paper introduces a comprehensive catalogue of multi-frequency radio measurements of over 300 BL Lac objects, obtained simultaneously with RATAN-600 over nine years, aiding in the study of their variable non-thermal emission.
Contribution
The paper provides the first extensive catalogue of simultaneous multi-frequency radio data for BL Lac objects, including spectral parameters and flux densities over nine years.
Findings
Catalogue includes data for over 300 BL Lacs and candidates.
Radio spectra and parameters are provided at multiple epochs.
Data supports studies of BL Lac variability and emission mechanisms.
Abstract
We present a new catalogue of the RATAN-600 multi-frequency measurements for BL Lac objects. The purpose of this catalogue is to compile the BL Lac multi-frequency data that is acquired with the RATAN-600 simultaneously at several frequencies. The BL Lac objects emit a strongly variable and polarized non-thermal radiation across the entire electromagnetic spectrum from radio to gamma-rays and represent about one percent of known AGNs. They belong to the blazar population and differ from other blazars featureless optical spectrum, which sometimes have absorption lines, or have weak and narrow emission lines. One of the most effective ways of studying the physics of BL Lacs is the use of simultaneous multi-frequency data. The multi-frequency broadband radio spectrum was obtained simultaneously with an accuracy of up to 1-2 minutes for four to six frequencies: 1.1, 2.3, 4.8, 7.7, 11.2, and…
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