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Program and Results of Investigations Rapid Variability of the BL Lac Object 3C 371 in Radio and Optical Ranges

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Ventspils International Radio Astronomy Centre (VIRAC) Inzenieru Str. 101, LV-3601 Ventspils, Latvia
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Odessa Observatory “URAN-4”, Institute of Radio Astronomy NAS of Ukraine Marazlievskaya Str. 1V, 65014 Odessa, Ukraine
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Astronomical Observatory of Odessa I.I. Mechnikov National University Marazlievskaya Str. 1V, 65014 Odessa, Ukraine
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Baldone Astronomical Observatory, University of Latvia Baldone, LV-2125 Baldone Region, Latvia
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Vihorlat Astronomical Observatory Mierova Str. 4, 06601 Humenne, Slovakia
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Author to whom correspondence should be addressed.
Galaxies 2020, 8(3), 69; https://doi.org/10.3390/galaxies8030069
Received: 7 August 2020 / Revised: 7 September 2020 / Accepted: 18 September 2020 / Published: 21 September 2020
BL Lac object 3C 371 is variable in optical and radio range, according to long-term monitoring data, for example AAVSO (American Association of Variable Star Observers) and OVRO (Owens Valley Radio Observatory). In addition, some authors note intra-night variability. However, in terms of access, just a few works are devoted to this topic, and questions remain about intra-day variability in radio range. The purpose of the work is to search for fast variability in radio (5, 6.1, 6.7 GHz) and optical bands (V, R, I) using international cooperation in 2019 and 2020 observation sessions. The 16-m radio telescope VIRAC, in Latvia, as well as optical telescopes AZT-3 (Mayaki, Ukraine), VNT (Vihorlat, Slovakia), and Schmidt camera (Baldone, Latvia) were used. To analyze variability, the STFT method of spectrograms and Lomb–Scargle periodograms for non-uniform time series were used. As result of the work, there is no correlation between optical and radio observations, and no significant quasi-harmonic variability was detected in radio range, but there is irregular low amplitude variability. In the optical range, there is variability with a characteristic time of about seven days and possibly less. Cyclical variability of 3C 371 was found in the optical range, and intra-day variability in radio range is most likely absent, as there are irregular variations and noise. It is planned to continue joint radio-optical observations 3C 371 to accumulate the necessary statistics. View Full-Text
Keywords: 3C 371; BL Lac object; variability; radio telescope 3C 371; BL Lac object; variability; radio telescope
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Sukharev, A.; Ryabov, M.; Bezrukovs, V.; Orbidans, A.; Bleiders, M.; Udovichenko, S.; Keir, L.; Eglitis, I.; Kudsey, I.; Dubovsky, P. Program and Results of Investigations Rapid Variability of the BL Lac Object 3C 371 in Radio and Optical Ranges. Galaxies 2020, 8, 69.

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