Отправить статью по E-mail A Water-Vapor Maser Flare in a High-Velocity Line toward W49N
- Авторы: Volvach L.N.1, Volvach A.E.1,2, Larionov M.G.3, MacLeod G.C.4,5, Wolak P.6, Olech M.6, Kramer B.7, Menten K.7, Kraus A.7, Brand J.8,9, Zanicelli A.8, Poppi S.10, Rigini S.8
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Учреждения:
- Crimean Astrophysical Observatory
- Institute of Applied Astronomy
- Astrospace Center, Lebedev Physical Institute
- Hartebeesthoek Radio Astronomy Observatory
- University of Western Ontario
- Centre for Astronomy, Faculty of Physics, Astronomy and Informatics
- Max-Planck-Institut für Radioastronomie
- INAF — Istituto di Radioastronomia
- Istituto di Radioastronomia
- Osservatorio Astronomico di Cagliari
- Выпуск: Том 45, № 5 (2019)
- Страницы: 321-330
- Раздел: Article
- URL: https://ogarev-online.ru/1063-7737/article/view/191278
- DOI: https://doi.org/10.1134/S1063773719050074
- ID: 191278
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Аннотация
Powerful flares in Galactic kilomasers are closely associated with regions of intense star formation. They contribute to the elucidation of physical processes occurring in these structures. We have recorded a superpowerful flare in the high-velocity −81 km s−1 line in the Galactic maser source W49N. As a result of our monitoring at the RT-22 (Simeiz), RT-32 (Torun), RT-100 (Effelsberg), and RT-32 (Medicina) radio telescopes in the period from September 2017 to November 2018, we have obtained the shape of the spectral flux density variations in the source with time. At the peak the flux density reached P≈5 ×104 Jy. The flare has a double pattern and different durations of its components. The pattern of spectral flux density variations for the first flare with a considerably shorter duration is apparently related to a sharp increase in the density of the medium and the photon flux and to a significant rise in the temperature to hundreds of kelvins. We propose a mechanism of primary energy release related to the existence of close massive multiple systems in star-forming regions. A powerful gravitational perturbation at the system’s periastron can lead to a partial ejection of the envelope of the central massive star in a direction close to the major axis of the ellipse of the companion’s orbit. This explains the significant asymmetry of high-velocity lines in W49N. The ejected envelope is an energy source more significant than the stellar wind and can explain the giant flares in the object. Further comprehensive studies in this direction, including monitoring VLBI studies, are needed to confirm this assumption.
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Об авторах
L. Volvach
Crimean Astrophysical Observatory
Автор, ответственный за переписку.
Email: volvach@bk.ru
Россия, Nauchny, Crimea, 298409
A. Volvach
Crimean Astrophysical Observatory; Institute of Applied Astronomy
Email: volvach@bk.ru
Россия, Nauchny, Crimea, 298409; nab. Kutuzova 10, St. Petersburg, 191187
M. Larionov
Astrospace Center, Lebedev Physical Institute
Email: volvach@bk.ru
Россия, Profsoyuznaya ul. 84/32, Moscow, 117997
G. MacLeod
Hartebeesthoek Radio Astronomy Observatory; University of Western Ontario
Email: volvach@bk.ru
ЮАР, Krugersdorp, 1740; 1151 Richmond Street, London, ON, N6A 3K7
P. Wolak
Centre for Astronomy, Faculty of Physics, Astronomy and Informatics
Email: volvach@bk.ru
Польша, Grudziadzka 5, Torun, 87-100
M. Olech
Centre for Astronomy, Faculty of Physics, Astronomy and Informatics
Email: volvach@bk.ru
Польша, Grudziadzka 5, Torun, 87-100
B. Kramer
Max-Planck-Institut für Radioastronomie
Email: volvach@bk.ru
Германия, Auf dem Hugel 69, Bonn, D-53121
K. Menten
Max-Planck-Institut für Radioastronomie
Email: volvach@bk.ru
Германия, Auf dem Hugel 69, Bonn, D-53121
A. Kraus
Max-Planck-Institut für Radioastronomie
Email: volvach@bk.ru
Германия, Auf dem Hugel 69, Bonn, D-53121
J. Brand
INAF — Istituto di Radioastronomia; Istituto di Radioastronomia
Email: volvach@bk.ru
Италия, Via Gobetti 101, Bologna, I-40129; Via Gobetti 101, Bologna, I-40129
A. Zanicelli
INAF — Istituto di Radioastronomia
Email: volvach@bk.ru
Италия, Via Gobetti 101, Bologna, I-40129
S. Poppi
Osservatorio Astronomico di Cagliari
Email: volvach@bk.ru
Италия, Via della Scienza 5, Selargius (CA), I-09047
S. Rigini
INAF — Istituto di Radioastronomia
Email: volvach@bk.ru
Италия, Via Gobetti 101, Bologna, I-40129
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