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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Astronomy Reports</journal-id><journal-title-group><journal-title xml:lang="en">Astronomy Reports</journal-title><trans-title-group xml:lang="ru"><trans-title>Астрономический журнал</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0004-6299</issn><issn publication-format="electronic">3034-5170</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">699453</article-id><article-id pub-id-type="doi">10.7868/S3034518925120051</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>СТАТЬИ</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">OH MASER EMISSION IN THE REGION OF ACTIVE STAR FORMATION W51M</article-title><trans-title-group xml:lang="ru"><trans-title>МАЗЕРНОЕ ИЗЛУЧЕНИЕ ОН В ОБЛАСТИ АКТИВНОГО ЗВЕЗДООБРАЗОВАНИЯ W51M</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Ashimbaeva</surname><given-names>N. T.</given-names></name><name xml:lang="ru"><surname>Ашимбаева</surname><given-names>Н. Т.</given-names></name></name-alternatives><email>email@example.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Lekht</surname><given-names>E. E.</given-names></name><name xml:lang="ru"><surname>Лехт</surname><given-names>Е. Е.</given-names></name></name-alternatives><email>eelekht@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Krasnov</surname><given-names>V. V.</given-names></name><name xml:lang="ru"><surname>Краснов</surname><given-names>В. В.</given-names></name></name-alternatives><email>email@example.com</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Shoutenkov</surname><given-names>V. R.</given-names></name><name xml:lang="ru"><surname>Шутенков</surname><given-names>В. Р.</given-names></name></name-alternatives><email>email@example.com</email><xref ref-type="aff" rid="aff3"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Lomonosov Moscow State University, Sternberg Astronomical Institute</institution></aff><aff><institution xml:lang="ru">Московский государственный университет им. М. В. Ломоносова, Государственный астрономический институт им. П. К. Штернберга</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Astrospace Center of the P. N. Lebedev Physical Institute of Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Астрокосмический центр Физического института им. П. Н. Лебедева Российской академии наук</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">Pushchino Radio Astronomy Observatory, Astrospace Center of the P. N. Lebedev Physical Institute of Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Пущинская радиоастрономическая обсерватория, Астрокосмический центр Физического института им. П. Н. Лебедева Российской академии наук</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2025</year></pub-date><volume>102</volume><issue>12</issue><issue-title xml:lang="en">VOL 51, NO12 (2025)</issue-title><issue-title xml:lang="ru">ТОМ 102, №12 (2025)</issue-title><fpage>1109</fpage><lpage>1120</lpage><history><date date-type="received" iso-8601-date="2025-12-25"><day>25</day><month>12</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Российская академия наук</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/" start_date="2026-12-24"/></permissions><self-uri xlink:href="https://jdigitaldiagnostics.com/0004-6299/article/view/699453">https://jdigitaldiagnostics.com/0004-6299/article/view/699453</self-uri><abstract xml:lang="en"><p>The results of a study of maser emission in the lines OH 1665 and 1667 MHz in the W51M star formation region are presented. The observations were carried out in 2022 and 2024 at the Large Radio Telescope in Nancay (France). The results of a study of the evolution of the flux density and the degree of circular polarization of individual spectral features are presented. Spatial identification of spectral features is carried out. It was found that the degree of linear polarization m<sub>L</sub> of the five strongest features (55.92, 57.18, 57.72, 58.27 and 59.5 km/s) in the 1665 MHz line does not exceed 5%. The vector of the transverse magnetic field for these features is oriented within the angle 19.6° – 39.2°. Thus, it can be assumed that there is a spatially organized large-scale magnetic field in W51M (e1 and e2).</p></abstract><trans-abstract xml:lang="ru"><p>Представлены результаты исследования мазерного излучения в линиях ОН 1665 и 1667 МГц в области звездообразования W51M. Наблюдения были выполнены в 2022 и 2024 гг. на Большом радиотелескопе в Нансэ (Франция). Проведены результаты исследования эволюции плотности потока и степени круговой поляризации отдельных спектральных деталей. Проведено пространственное отождествление спектральных деталей. Получено, что степень линейной поляризации m<sub>L</sub> пяти наиболее сильных деталей (55.92, 57.18, 57.72, 58.27 и 59.5 км/с) в линии 1665 МГц не превышает 5%. Вектор поперечного магнитного поля для этих деталей ориентирован в пределах угла 19.6° – 39.2°. Таким образом, можно предположить, что имеется пространственно организованное крупномасштабное для W51M (e1 и e2) магнитное поле.</p></trans-abstract><kwd-group xml:lang="en"><kwd>star formation</kwd><kwd>OH masers</kwd><kwd>molecular clouds and bipolar outflows</kwd><kwd>magnetic field</kwd><kwd>individual objects (W51 Main, North)</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>звездообразование</kwd><kwd>мазеры ОН</kwd><kwd>молекулярные облака и биполярные потоки</kwd><kwd>магнитное поле</kwd><kwd>индивидуальные объекты (W51 Main, North)</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование выполнено в рамках государственного задания МГУ им. М. В. Ломоносова.</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>G. Westerhout, Bull. Astron. Inst. Netherland 14, 215 (1958).</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>D.M. Merhinger, Astropys. 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