A study of the asymmetry in the H2O maser line at lambda = 1.35 cm on the base of the hyperfine structure

Lekht, E.E.; Silant'ev, N.A.; Rudnitskij, G.M.; Alexeeva, G.A.

Статья опубликована в высокорейтинговом журнале

Информация о цитировании статьи получена из Web of Science, Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.

Авторы: Lekht E.E., Silant'ev N.A., Rudnitskij G.M., Alexeeva G.A.
Журнал: Astronomy and Astrophysics
Том: 492
Номер: 2
Год издания: 2008
Издательство: Springer Verlag
Местоположение издательства: Germany
Первая страница: 475
Последняя страница: 480
DOI: 10.1051/0004-6361:200810019
Аннотация: The results of analyzing asymmetry in the H2O maser lines at = 1.35 cm are presented. We investigated in detail the known mechanism of the asymmetry origin due to the hyperfine structure of the 616 523 transition and different (not equidistant) positions of the corresponding triplet components. The triplet of the lines is characterized by the sum of extinction factors that are continuously transformed into a single-peaked asymmetric extinction coefficient, with the increase in the Doppler widths (characterizing by effective Doppler velocity ). A noticeable asymmetry corresponds to 0.5-1 km s-1. For higher values of the extinction factor approaches a Gaussian shape with the decreasing magnitude of the profile asymmetry. An appreciable asymmetry in unsaturated maser lines can only arise at 0.5 km s-1, if there are very narrow linewidths ( 0.2-0.4 km s-1). But observed saturated masers possess a fairly high degree of the line asymmetry, 10-40%. Most probably, this asymmetry is a result of rebroadening of the linewidth up to the value that is comparable to the width of the asymmetric extinction coefficient.
Добавил в систему: Рудницкий Георгий Михайлович

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A study of the asymmetry in the H2O maser line at lambda = 1.35 cm on the base of the hyperfine structureстатья

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