Long-Term Monitoring of the W44C (G 34.3+0.15) Maser in the 1.35 cm Water Vapor and 18 cm Hydroxyl Lines

Lekht, E.E.; Pashchenko, M.I.; Rudnitskii, G.M.

Авторы: Lekht E.E., Pashchenko M.I., Rudnitskii G.M.
Журнал: Astronomy Reports
Том: 56
Номер: 1
Год издания: 2012
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: 45
Последняя страница: 62
DOI: 10.1134/S1063772912010040
Аннотация: Results of monitoring the H2Oand OH masers in W44C, located near the cometaryHII region G34.3+0.15, are reported. Observations in the water-vapor line at λ = 1.35 cm were carried out on the 22-meter radio telescope of the Pushchino Radio Astronomy Observatory (Russia) from November 1979 to March 2011, and in the hydroxyl lines at λ = 18 cm on the large Nanc¸ ay radio telescope (France). Activity maxima and minima of the water maser alternated. The average period of the activity is ∼ 14 years, consistent with results obtained earlier for a number of other sources associated with regions of active star formation. In periods of enhanced maser activity, two series of strong H2O maser flares were observed, which were related to two different clusters of maser spots located at the front of a shock at the periphery of the ultracompact region UH II. These series of flares may be associated with cyclic activity of the protostellar object in UH II. In the remaining time intervals, there were mainly short-lived flares of single features. The Stokes parameters for the observations in the hydroxyl lines were determined. Zeeman splitting was observed in the profile of the 1667 MHz OH main line at a velocity of 58.5 km/s, and was used to estimate the intensity of the line-of-sight component of the magnetic field (1.2 mG).
Добавил в систему: Пащенко Михаил Иванович

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Long-Term Monitoring of the W44C (G 34.3+0.15) Maser in the 1.35 cm Water Vapor and 18 cm Hydroxyl Linesстатья

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