aat Acta Astrophys. Tau. Acta Astrophysica Taurica 2712-925X Kiselev Nikolai Nikolaevich, Mosсow, settlement Moskovskii, Tat'yanin Park Str., 12, Moscow, Russia. RU 63 10.34898/aat.vol4.iss3.pp5-10 Modern Instruments and Methods in Astronomy Conference Proceedings Cluster analysis on the example of blazars from the Roma-BZCAT catalog Kudryavtsev Dmitry Sotnikova Yulia Stolyarov Vladislav Mufakharov Timur Vlasyuk Valery Cherepkova Yulia Special Astrophysical Observatory of the Russian Academy of Sciences, Nizhny Arkhyz 369167, Russia Special Astrophysical Observatory of the Russian Academy of Sciences, Nizhny Arkhyz 369167, Russia Special Astrophysical Observatory of the Russian Academy of Sciences, Nizhny Arkhyz 369167, Russia; Astrophysics Group, Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, UK Special Astrophysical Observatory of the Russian Academy of Sciences, Nizhny Arkhyz 369167, Russia; Kazan Federal University, Kazan 420008, Russia Special Astrophysical Observatory of the Russian Academy of Sciences, Nizhny Arkhyz 369167, Russia Special Astrophysical Observatory of the Russian Academy of Sciences, Nizhny Arkhyz 369167, Russia 19 11 2023 4 3 5 10 28 09 2023 Copyright (c) 2026 Kudryavtsev D., Sotnikova Y., Stolyarov V., Mufakharov T., Vlasyuk V., Cherepkova Y. 2026 Dmitry Kudryavtsev, Yulia Sotnikova, Vladislav Stolyarov, Timur Mufakharov, Valery Vlasyuk, Yulia Cherepkova The metadata for this submission is licensed under a Creative Commons Attribution 4.0 International License. Copyright and publishing rights for texts published in Acta Astrophysica Taurica is retained by the authors, with first publication rights granted to the journal.Texts are free to use with proper attribution and link to the licensing (Creative Commons Attribution 4.0 International).

Based on the collected multiwavelength data, we perform a cluster analysis for the blazars of the Roma-BZCAT catalog, selecting groups of blazars with similar properties. Using machine learning methods, we constructed an independent classification of the blazars and compared it with the known Roma-BZCAT classification. The clustering algorithms divide both BL Lac-type objects and flat-spectrum radio quasars (FSRQs) into two subclasses along with a separate group of mixed BL Lacs and FSRQs. The clustering did not reveal difference between the BL Lacs and galaxy-dominated BL Lacs, unlike in the Roma-BZCAT classification.

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