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Abstract <p>In the paper, archival data of the RadioAstron ground–space interferometer project concerning observations of radiation in the OH hydroxyl lines (1665 and 1667 MHz transitions) in the Cep A source have been analyzed. The observations have been carried out on January 7, 2013. The duration of the observation session was about one hour. Ground-based radio telescopes at the Zelenchuk Observatory (Special Astrophysical Observatory of the Russian Academy of Sciences, North Caucasus, Russian Federation), in Yevpatoria (Crimea, Russian Federation), and at the Torun Astronomy Center (Republic of Poland) have participated in the observations. No interferometric response has been detected at the ground–space bases. Several compact sources with angular sizes from 10 to 20 milliarcseconds have been detected at the base between the radio telescopes in Torun and at the Zelenchuk Observatory. These angular sizes correspond to linear sizes of 7.5–15 astronomical units (AU). It has been shown that the detected compact sources are distributed over a region of 750–1500 AU.</p>

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Compact Sources of OH Maser Emission in the Star-Forming Region Cep A

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  • 发表日期：

    2025年9月1日

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  • I. E. Val’tts

摘要

Abstract

In the paper, archival data of the RadioAstron ground–space interferometer project concerning observations of radiation in the OH hydroxyl lines (1665 and 1667 MHz transitions) in the Cep A source have been analyzed. The observations have been carried out on January 7, 2013. The duration of the observation session was about one hour. Ground-based radio telescopes at the Zelenchuk Observatory (Special Astrophysical Observatory of the Russian Academy of Sciences, North Caucasus, Russian Federation), in Yevpatoria (Crimea, Russian Federation), and at the Torun Astronomy Center (Republic of Poland) have participated in the observations. No interferometric response has been detected at the ground–space bases. Several compact sources with angular sizes from 10 to 20 milliarcseconds have been detected at the base between the radio telescopes in Torun and at the Zelenchuk Observatory. These angular sizes correspond to linear sizes of 7.5–15 astronomical units (AU). It has been shown that the detected compact sources are distributed over a region of 750–1500 AU.