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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">647658</article-id><article-id pub-id-type="doi">10.31857/S0004629924080053</article-id><article-id pub-id-type="edn">ITFAOF</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">Analysis of gradient profiles and morphology of the Vela Jr. supernova remnant</article-title><trans-title-group xml:lang="ru"><trans-title>Анализ градиентных профилей и морфологии остатка сверхновой Vela Jr</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Pronicheva</surname><given-names>S. A.</given-names></name><name xml:lang="ru"><surname>Проничева</surname><given-names>С. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Skobeltsyn Institute of Nuclear Physics;<sup> </sup>Faculty of Physics</p></bio><bio xml:lang="ru"><p>НИИ ядерной физики им. Д. В. Скобельцына; Физический факультет</p></bio><email>proncof@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Iyudin</surname><given-names>A. F.</given-names></name><name xml:lang="ru"><surname>Июдин</surname><given-names>А. Ф.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Skobeltsyn Institute of Nuclear Physics</p></bio><bio xml:lang="ru"><p>НИИ ядерной физики им. Д. В. Скобельцына</p></bio><email>aiyudin@srd.sinp.msu.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Lomonosov Moscow State University</institution></aff><aff><institution xml:lang="ru">Московский государственный университет им. М. В. Ломоносова</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-08-15" publication-format="electronic"><day>15</day><month>08</month><year>2024</year></pub-date><volume>101</volume><issue>8</issue><issue-title xml:lang="ru"/><fpage>743</fpage><lpage>752</lpage><history><date date-type="received" iso-8601-date="2025-01-28"><day>28</day><month>01</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, The Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Российская академия наук</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="en">The Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/0004-6299/article/view/647658">https://journals.eco-vector.com/0004-6299/article/view/647658</self-uri><abstract xml:lang="en"><p>We present the study of gradient profiles of the Vela Jr. northwestern rim in X-ray emission and the morphology of this supernova remnant in various spectral ranges of electromagnetic radiation to estimate the distance to the object and its age. In this work were used radiation intensity spatial distributions for the northwestern rim of the supernova remnant RX J0852.0–4622 in the X-ray energy range, 1000.0–2000.0 eV, obtained from measurements of the EPIC-pn camera of the XMM-Newton space observatory for four consecutive time intervals. From the calculated shifts over the period from 2004 to 2018 of the X-ray intensity profiles along the northwestern rim of Vela Jr., limits were obtained on the angular expansion rate of the shock wave of this remnant’s region into a cloud of gas, probably hydrogen: minimum speed <math xmlns:mml="http://www.w3.org/1998/Math/MathML"><msubsup><mi>V</mi><mi>θ</mi><mrow><mi>m</mi><mi>a</mi><mi>x</mi></mrow></msubsup></math> = 0.29ʺ ± 0.04ʺ year <sup>–1 </sup>and maximum <math xmlns:mml="http://www.w3.org/1998/Math/MathML"><msubsup><mi>V</mi><mi>θ</mi><mn>60</mn></msubsup></math> = 0.82ʺ ± 0.11ʺ year <sup>–1 </sup>.The hydrogen cloud with which the supernova shock wave interacts along the northwestern rim of Vela Jr. is very inhomogeneous. The upper limits for the age of the remnant and the distance to it based on the cloud density estimate are 1920 years and 450 parsecs, respectively. More stringent restrictions on such parameters of RX J0852.0–4622 as its age and distance to it were obtained by analyzing the remnant’s two-ring morphology based on its images in ultraviolet, X-ray, radio and gamma rays: 1190 ± 250 years and 280 ± 60 parsecs.</p></abstract><trans-abstract xml:lang="ru"><p>В работе были изучены градиентные профили северо-западного лимба Vela Jr. в рентгеновском излучении и морфология остатка в различных спектральных диапазонах электромагнитного излучения для оценки расстояния до объекта и его возраста. Были использованы пространственные распределения интенсивности излучения северо-западного лимба остатка сверхновой RX J0852.0–4622 в диапазоне энергий рентгеновского излучения 1000.0–2000.0 эВ, полученные по измерениям EPIC-pn камеры космического телескопа XMM-Newton для четырех последовательных временных промежутков. Из рассчитанных смещений профилей интенсивности рентгена вдоль северо-западного лимба Vela Jr. с 2004 по 2018 г. были получены пределы на угловую скорость расширения ударной волны данной области остатка в облаке газа, вероятно водорода: минимальная скорость <math xmlns:mml="http://www.w3.org/1998/Math/MathML"><msubsup><mi>V</mi><mi>θ</mi><mrow><mi>m</mi><mi>a</mi><mi>x</mi></mrow></msubsup></math> = 0.29ʺ ± 0.04ʺ год <sup>–</sup><sup>1 </sup>и максимальная <math xmlns:mml="http://www.w3.org/1998/Math/MathML"><msubsup><mi>V</mi><mi>θ</mi><mn>60</mn></msubsup></math> = 0.82ʺ ± 0.11ʺ год <sup>–</sup><sup>1 </sup>. Облако водорода, с которым взаимодействует ударная волна сверхновой вдоль северо-западного лимба Vela Jr., очень неоднородно. Верхние границы возраста остатка и расстояния до него по оценке плотности облака равны, соответственно, 1920 лет и 450 парсек. Более жесткие ограничения на такие параметры RX J0852.0–4622, как его возраст и расстояние до него, были получены в результате анализа двух-кольцевой морфологии остатка по его изображениям в ультрафиолете, рентгене, радио и гамма-диапазонах: 1190 ± 250 лет и 280 ± 60 парсек.</p></trans-abstract><kwd-group xml:lang="en"><kwd>supernova remnant</kwd><kwd>RX J0852.0–4622</kwd><kwd>Vela Jr.</kwd><kwd>X-ray gradient profiles</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>остаток сверхновой</kwd><kwd>RX J0852.0-4622</kwd><kwd>Vela Jr.</kwd><kwd>рентгеновские градиентные профили</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Российский научный фонд</institution></institution-wrap><institution-wrap><institution xml:lang="en">Russian Science Foundation</institution></institution-wrap></funding-source><award-id>23-42-10005</award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>B. 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