The Fast Variable Maser Source IRAS 05338-0624

Pashchenko, M.I.; Rudnitskii, G.M.; Colom, P.

Авторы: Pashchenko M.I., Rudnitskii G.M., Colom P.
Журнал: Astronomy Reports
Том: 53
Номер: 6
Год издания: 2009
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: 541
Последняя страница: 551
DOI: 10.1134/S1063772909060067
Аннотация: A new OH maser was detected in January 2008 toward the infrared source IRAS 05338−0624 in the dark cloud L1641N. The observations were carried out on the Nancay Radio Telescope (France) in the 1667 and 1665 MHz OH lines. In the spectra of both lines, thermal OH emission from the surrounding molecular cloud is present at radial velocities VLSR = 6–9 km/s. In addition, a narrow maser feature is present in both lines at VLSR = 2 km/s in the profiles obtained on January 7, 2008; the peak flux densities at 1667 and 1665 MHz are 1.5 and 0.4 Jy, respectively. No OH maser emission was detected in February–July 2008. Then, a maser feature was again observed in the 1665 MHz line on August 20, 2008, at the same velocity as in January, VLSR = 2 km/s, with a peak flux density of 0.4 Jy. No 1667 MHz counterpart was observed with an upper limit of ∼0.1 Jy. Emission in both OH lines was again absent on September 18. The source was also observed in the H2O line at λ = 1.35 cm on the 22-m radio telescope of the Pushchino Radio Astronomy Observatory (Russia) on February 7 and 13, 2008. In both cases, a maser feature was detected at VLSR = 9 km/s, with peak flux densities of 35 and 15 Jy, respectively. After the its apparent absence in April, H2O maser emission reappeared on May 14, 2008, at VLSR = 7 km/s with a flux density of about 15 Jy. The history of previous observations of the object in the OH and H2O lines is traced. The maser displays strong and rapid flux variability in the lines of both molecules, as is typical of young low luminosity stellar objects at early stages of their evolution.
Добавил в систему: Пащенко Михаил Иванович

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