Ammonia masers towards G 358.931-0.030
Электронный научный архив УРФУ
Информация об архиве | Просмотр оригинала| Поле | Значение | |
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Ammonia masers towards G 358.931-0.030
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| Автор |
McCarthy, T. P.
Breen, S. L. Kaczmarek, J. F. Chen, X. Parfenov, S. Sobolev, A. M. Ellingsen, S. P. Burns, R. A. Macleod, G. C. Sugiyama, K. Brierley, A. L. Van, Den, Heever, S. P. |
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| Тематика |
ISM: INDIVIDUAL OBJECTS: G 358.931-0.030
ISM: MOLECULES MASERS RADIO LINES: ISM STARS: FORMATION AMMONIA GALAXIES METHANOL RADIATIVE TRANSFER AMMONIA MASERS CLASS II ISM: INDIVIDUAL OBJECT: G 358.931-0.030 ISM: INDIVIDUAL OBJECTS ISM:MOLECULES MASER EMISSIONS METHANOL MASERS RADIATIVE TRANSFER CALCULATIONS RADIO LINES: ISM STARS FORMATION MASERS |
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| Описание |
We report the detection of ammonia masers in the non-metastable (6, 3), (7, 5), and (6, 5) transitions; the latter being the first unambiguous maser detection of that transition ever made. Our observations include the first very long baseline interferometry detection of ammonia maser emission, which allowed effective constraining of the (6, 5) maser brightness temperature. The masers were detected towards G 358.931-0.030, a site of 6.7-GHz class II methanol maser emission that was recently reported to be undergoing a period of flaring activity. These ammonia masers appear to be flaring contemporaneously with the class II methanol masers during the accretion burst event of G 358.931-0.030. This newly detected site of ammonia maser emission is only the 12th such site discovered in the Milky Way. We also report the results of an investigation into the maser pumping conditions, for all three detected masing transitions, through radiative transfer calculations constrained by our observational data. These calculations support the hypothesis that the ammonia (6, 5) maser transition is excited through high colour temperature infrared emission, with the (6, 5) and (7, 5) transition line ratio implying dust temperatures >400 K. Additionally, we detect significant linearly polarized emission from the ammonia (6, 3) maser line. Alongside our observational and radiative transfer calculation results, we also report newly derived rest frequencies for the ammonia (6, 3) and (6, 5) transitions. © 2023 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.
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| Дата |
2024-04-05T16:25:09Z
2024-04-05T16:25:09Z 2023 |
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| Тип |
Article
Journal article (info:eu-repo/semantics/article) |info:eu-repo/semantics/publishedVersion |
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| Идентификатор |
Mccarthy, T, Breen, S, Kaczmarek, J, Chen, X, Parfenov, S, Sobolev, A, Ellingsen, S, Burns, R, Macleod, G, Sugiyama, K, Brierley, AL & Van den heever, S 2023, 'Ammonia masers towards G 358.931−0.030', Monthly Notices of the Royal Astronomical Society, Том. 522, № 3, стр. 4728-4739. https://doi.org/10.1093/mnras/stad1278
Mccarthy, T., Breen, S., Kaczmarek, J., Chen, X., Parfenov, S., Sobolev, A., Ellingsen, S., Burns, R., Macleod, G., Sugiyama, K., Brierley, A. L., & Van den heever, S. (2023). Ammonia masers towards G 358.931−0.030. Monthly Notices of the Royal Astronomical Society, 522(3), 4728-4739. https://doi.org/10.1093/mnras/stad1278 0035-8711 Final All Open Access, Hybrid Gold, Green https://www.scopus.com/inward/record.uri?eid=2-s2.0-85160591960&doi=10.1093%2fmnras%2fstad1278&partnerID=40&md5=bc7fb2b5a92faae62fe722be3b075ee8 https://doi.org/10.1093/mnras/stad1278 http://elar.urfu.ru/handle/10995/130530 10.1093/mnras/stad1278 85160591960 000992702500006 |
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| Язык |
en
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| Права |
Open access (info:eu-repo/semantics/openAccess)
cc-by https://creativecommons.org/licenses/by/4.0/ |
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| Формат |
application/pdf
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| Издатель |
Oxford University Press
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| Источник |
Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society |
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