Classification of BLL Blazars by Optical Activity Types

We have carried out a spectral classification by the Activity Types for a subsample of Blazars from the BZCAT v.5 Catalogue, namely the BL Lac (BLL, Lacertids) candidates, designated in the Catalogue as BZB subtype objects. The classification is based on the Sloan Digital Sky Survey (SDSS) homogeneo...

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Bibliographic Details
Published in:Astrophysics 2024-08, Vol.67 (2), p.119-127
Main Authors: Mickaelian, A. M., Abrahamyan, H. V., Paronyan, G. M., Mikayelyan, G. A., Sukiasyan, A. G., Mkrtchyan, V. K.
Format: Article
Language:English
Subjects:
Astronomy
Astrophysics and Astroparticles
Astrophysics and Cosmology
Blazars
Classification
Observations and Techniques
Optical activity
Physics
Physics and Astronomy
Quasars
Sky surveys (astronomy)
Space Exploration and Astronautics
Space Sciences (including Extraterrestrial Physics
Spectral classification
Spectroscopy
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Summary:We have carried out a spectral classification by the Activity Types for a subsample of Blazars from the BZCAT v.5 Catalogue, namely the BL Lac (BLL, Lacertids) candidates, designated in the Catalogue as BZB subtype objects. The classification is based on the Sloan Digital Sky Survey (SDSS) homogeneous medium-resolution optical spectroscopy and along with the standard BPT-type diagnostic diagrams, we have applied our newly introduced fine classification scheme with subtypes of Quasars and considering many more features. Out of 1151 BZB objects, 552 having SDSS spectra were classified. After new classification, 259 (46.1%) of 552 have not changed their optical class, and 293 (53.1%) of these objects have changed their optical class. Having this new information on the optical classification we suggest to change the classification of some objects in BZCAT: for 130 BZB objects to BZG, for 18 BZB objects to BZQ and for 145 BZB objects to BZU.
ISSN:0571-7256
1573-8191
DOI:10.1007/s10511-024-09822-5