Nature of continuum emission in the source of the water maser super-flare G25.65+1.04
Электронный научный архив УРФУ
Информация об архиве | Просмотр оригинала| Поле | Значение | |
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Nature of continuum emission in the source of the water maser super-flare G25.65+1.04
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| Автор |
Bayandina, O. S.
Burns, R. A. Kurtz, S. E. Moscadelli, L. Sobolev, A. M. Stecklum, B. Val'Tts, I. E. |
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| Тематика |
MASERS
STARS: FORMATION STARS: INDIVIDUAL: G25.65+1.04 GALAXIES STARS CONTINUUM EMISSION CONTINUUM SOURCE MASER EMISSIONS MILKY WAYS PROPERTY PROTOSTARS STAR: INDIVIDUAL: G25.65+1.04 STARS FORMATION STARS: INDIVIDUAL: PROXIMA CENTAURI WATER MASERS MASERS |
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| Описание |
Context. The G25.65+1.04 source is one of the few known 'super-flare' water masers in the Milky Way, but in contrast to other super-flare sources, it remains the least studied. In fact, even the nature of the source driving the water maser is still unclear. Aims. With this project, we aim to clarify the composition and properties of the G25.65+1.04 region by means of examining the parameters of the continuum sources and establishing their association with masers of different types. Methods. Our previous VLA (Karl G. Jansky Very Large Array) observation detected four continuum peaks (VLA 1-4), three of which (VLA 1-3) were closely spaced and presented a linear orientation. However, the observation, which used the VLA B configuration, lacked the spatial resolution to resolve individual sources. A higher-resolution (A configuration) VLA observation of the continuum and spectral lines was conducted in 2019 using the L, S, C, and Ku bands. Results. For the first time, the continuum source VLA 1 - associated with the flaring water maser - is resolved into two components: VLA 1A and 1B. The component VLA 1A and the water maser are found to spatially coincide and are thought to be powered by the same source, a protostar at an early stage of evolution showing active ejection. We argue that VLA 2 pinpoints an actively ejecting high-mass protostar, as it is associated with a 6.7 GHz methanol maser and a magnetised jet traced by a 22 GHz H2O maser. Highly polarised OH maser emission is detected in the vicinity of VLA 1-2, with the brightest OH maser found in VLA 2. The magnetic field, identified from the OH maser emission, ranges from ~+0:4mG in VLA 1A to ~-8mG in VLA 2. Conclusions. The G25.65+1.04 region is found to consist of at least two young stellar objects: VLA 1A and VLA 2. Both sources are found to be at an active accretion and ejection stage of evolution. © The Authors 2023.
Ministero dell’Istruzione, dell’Università e della Ricerca, MIUR: CIR01_00010; Ministry of Education and Science of the Russian Federation, Minobrnauka: FEUZ-2023-0019 This paper reports data from VLA program 19A-423. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. O.B. acknowledges financial support from the Italian Ministry of University and Research - Project Proposal CIR01_00010. The work of AMS was supported by the Ministry of science and higher education of the Russian Federation, agreement FEUZ-2023-0019. |
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| Дата |
2024-04-05T16:22:18Z
2024-04-05T16:22:18Z 2023 |
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| Тип |
Article
Journal article (info:eu-repo/semantics/article) |info:eu-repo/semantics/publishedVersion |
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| Идентификатор |
Bayandina, O, Burns, R, Kurtz, S, Moscadelli, L, Sobolev, A, Stecklum, B & Val’tts, IE 2023, 'Nature of continuum emission in the source of the water maser super-flare G25.65+1.04', Astronomy and Astrophysics, Том. 673, A60. https://doi.org/10.1051/0004-6361/202346023
Bayandina, O., Burns, R., Kurtz, S., Moscadelli, L., Sobolev, A., Stecklum, B., & Val’tts, I. E. (2023). Nature of continuum emission in the source of the water maser super-flare G25.65+1.04. Astronomy and Astrophysics, 673, [A60]. https://doi.org/10.1051/0004-6361/202346023 0004-6361 Final All Open Access, Hybrid Gold, Green https://www.scopus.com/inward/record.uri?eid=2-s2.0-85159627596&doi=10.1051%2f0004-6361%2f202346023&partnerID=40&md5=f99ca6ad04267e60fd29323b581ed8ca https://doi.org/10.1051/0004-6361/202346023 http://elar.urfu.ru/handle/10995/130486 10.1051/0004-6361/202346023 85159627596 000983328700003 |
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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 |
EDP Sciences
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| Источник |
Astronomy & Astrophysics
Astronomy and Astrophysics |
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