LPA LPI 射电望远镜观测到的星际闪烁源 B0821+394 和 B1812+412

IF 1.1 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Astronomy Reports Pub Date : 2024-10-25 DOI:10.1134/S1063772924700720

S. A. Tyul’bashev, I. V. Chashei, I. A. Grishanova, G. E. Tyul’basheva, I. A. Subaev

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引用次数: 0

摘要

对射电源 B0821+394 和 B1812+412 的紧凑成分进行了为期十年的长期变化搜索。观测使用了工作频率为 111 MHz 的 LPA LPI 射电望远镜。根据我们的估计，这两个来源的特征变率时间为 1.5-2.5 年。观测结果表明，观测到的变异与辐射通量的内在变化无关，而是由于星际介质的不均匀性造成的折射闪烁。根据所获得的星源视角尺寸上限估计，无线电辐射散射的主要原因是集中在足够薄的屏幕中的湍流等离子体，其距离不超过 300-400 pc。

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Interstellar Scintillations of Sources B0821+394 and B1812+412 as Observed by the LPA LPI Radio Telescope

The search for long-term variability of compact components of radio sources B0821+394 and B1812+412 over an interval of ten 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.

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来源期刊

Astronomy Reports 地学天文-天文与天体物理

CiteScore

1.40

自引率

20.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Astronomy Reports is an international peer reviewed journal that publishes original papers on astronomical topics, including theoretical and observational astrophysics, physics of the Sun, planetary astrophysics, radio astronomy, stellar astronomy, celestial mechanics, and astronomy methods and instrumentation.