Interstellar scintillation of sources B0821+394 and B1812+412 according to observations on the LPA LPI radio telescope

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Abstract

The search for long-term variability of compact components of radio sources B0821+394 and B1812+412 over an interval of 10 years was carried out. The LPA LPI radio telescope with an operating frequency of 111 MHz was used for observations. According to our estimates, the characteristic time of variability for both sources is 1.5–2.5 years. It is shown that the observed variability is not related to intrinsic variations in the radiation flux, but is due to refractive scintillation on inhomogeneities of the interstellar medium. From the obtained upper estimates of the apparent angular dimensions of the sources, it follows that the main contribution to the scattering of radio emission is made by turbulent plasma concentrated in sufficiently thin screens, the distance to which does not exceed 300–400 pc.

About the authors

S. A. Tyul'bashev

Lebedev Physical Institute

Author for correspondence.
Email: serg@prao.ru

Astrospace center, Pushchino radio astronomy observatory

Russian Federation, Pushchino, Moscow region

I. V. Chashei

Lebedev Physical Institute

Email: serg@prao.ru

Astrospace center, Pushchino radio astronomy observatory

Russian Federation, Pushchino, Moscow region

I. A. Grishanova

Pushchino brunch of Russian Biotechnological University (Rosbiotech)

Email: serg@prao.ru
Russian Federation, Pushchino, Moscow region

G. E. Tyul'basheva

Institute of Mathematical Problems of Biology RAS (IMPB RAS) brunch of Keldysh Institute of Applied Mathematics of Russian Academy of Sciences

Email: serg@prao.ru
Russian Federation, Pushchino, Moscow region

I. A. Subaev

Lebedev Physical Institute

Email: serg@prao.ru

Astrospace center, Pushchino radio astronomy observatory

Russian Federation, Pushchino, Moscow region

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