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Monitoring of the Blazar J0238+1636 with the RATAN-600 and RT-32 in 2014−2019

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Abstract

The presented observation results of the blazar J0238+1636 were obtained in: 2014–2019 with the RATAN-600 radio telescope from the Special Astrophysical Observatory of the Russian Academy of Sciences at 2.3, 4.8, 8.2, 11.2, and 21.7 GHz; and 2015–2017 with the 32-m Zelenchuk and Badary radio telescopes of the Institute of Applied Astronomy of the Russian Academy of Sciences at 4.84 and 8.57 GHz. Two flares were detected on the long-term light curve. The time scale for variability on the rising branch of the first flare is τvar = 0.5 year, and the upper limit for the linear and angular sizes of the emitting region at 21.7 GHz are 0.3 pc and 0.05 mas, respectively. The brightness temperature is Tb ≥ 2.6 × 1013 K, and the Doppler factor is δ ≥ 3. In three sets of the source’s daily observations, which lasted up to three months each, no significant variability on the day-to-day scale was found after subtracting the long-term variability. In the RT-32 data, the intraday variability (IDV) was found at a frequency of 4.84 GHz in three out of 15 sessions and at 8.57 GHz in two out of 13 sessions. The characteristic times for variability are 4−5 hours.

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ACKNOWLEDGMENTS

The work was performed by using equipment from the core facility center of the “Kvazar−KVO” complex of IAA RAS.

Funding

The study of IDV and the RATAN-600 observations were supported by the Ministry of Science and Higher Education of Russia (GK 14.518.11.7054).

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Authors and Affiliations

  1. Institute of Applied Astronomy, Russian Academy of Sciences, 197110, St. Petersburg, Russia

    M. A. Kharinov, A. V. Ipatov & I. A. Ipatova

  2. Sternberg Astronomical Institute, Moscow State University, 119991, Moscow, Russia

    V. K. Konnikova

  3. Special Astrophysical Observatory, Russian Academy of Sciences, 369167, Nizhnii Arkhyz, Karachai-Cherkessian Republic, Russia

    A. K. Erkenov

Authors
  1. M. A. Kharinov
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  2. V. K. Konnikova
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  3. A. V. Ipatov
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  4. I. A. Ipatova
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  5. A. K. Erkenov
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Correspondence to M. A. Kharinov.

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Translated by E. Petrova

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Kharinov, M.A., Konnikova, V.K., Ipatov, A.V. et al. Monitoring of the Blazar J0238+1636 with the RATAN-600 and RT-32 in 2014−2019. Astron. Rep. 64, 350–362 (2020). https://doi.org/10.1134/S1063772920050029

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  • DOI: https://doi.org/10.1134/S1063772920050029

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