Investigation of OH and H2O Masers in the Star-Forming Region G 188.946+0.886

Ashimbaeva, N.T.; Colom, P.; Lekht, E.E.; Pashchenko, M.I.; Rudnitskii, G.M.; Tolmachev, A.M.

Авторы: Ashimbaeva N.T., Colom P., Lekht E.E., Pashchenko M.I., Rudnitskii G.M., Tolmachev A.M.
Журнал: Astronomy Letters
Том: 42
Номер: 10
Год издания: 2016
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: 652
Последняя страница: 664
DOI: 10.1134/S1063773716100029
Аннотация: We present the results of our observations of the maser radio emission sourceG188.946+0.886 in hydroxyl (OH) molecular lines with the radio telescope of the Nanc¸ ay Observatory (France) and in the H2O line at λ = 1.35 cm with the RT-22 radio telescope at the Pushchino Observatory (Russia). An emission feature in the 1720-MHz satellite line of the OH ground state has been detected for the first time. The radial velocity of the feature, VLSR = 3.6 km s−1, has a “blue” shift relative to the range of emission velocities in the main 1665- and 1667-MHz OH lines, which is 8–11 km s−1. This suggests a probable connection of the observed feature in the 1720-MHz line with the “blue” wing of the bipolar outflow observed in this region in the CO line. We have estimated the magnetic field strength for three features (0.90 and 0.8 mG for 1665 MHz and 0.25 mG for 1720 MHz) from the Zeeman splitting in the 1665- and 1720-MHz lines. No emission and (or) absorption has been detected in the other 1612-MHz satellite OH line. Three cycles of H2O maser activity have been revealed. The variability is quasi-periodic in pattern. There is a general tendency for the maser activity to decrease. Some clusters of H2O maser spots can form organized structures, for example, chains and other forms.
Добавил в систему: Рудницкий Георгий Михайлович

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Investigation of OH and H2O Masers in the Star-Forming Region G 188.946+0.886статья

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