Some results of 22-year monitoring (1982–2003) of Sagittarius B2 in the 1.35-cm line |
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| Authors: | E E Lekht O Ramírez Hernández A M Tolmachev |
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| Institution: | (1) Instituto Nacional de Astrofísica, óptica y Electrónica, Luis Enrique Erro No. 1, Apdo Postal 51 y 216, 72840 Tonantzintla, Puebla, México;(2) Sternberg Astronomical Institute, Universitetskii pr. 13, Moscow, 119992, Russia;(3) Pushchino Radio Astronomy Observatory, Astro Space Center, Lebedev Physical Institute, Russian Academy of Sciences, Pushchino, Moscow oblast, 142290, Russia |
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| Abstract: | A catalog of λ=1.35 cm water-vapor maser spectra in Sgr B2 obtained in 1992–2003 is presented; this supplements our results for earlier observations in 1982–1992. Sgr B2 was monitored using the 22 m radio telescope of the Pushchino Radio Astronomy Observatory. The whole monitoring dataset for 1982–2003 has been analyzed. The emission received is a superposition of radiation from various parts of the entire Sgr B2 region, but the main contribution is made by two sources: Sgr B2(M) and Sgr B2(N). The monitoring did not reveal any long-term component of the integrated maser flux variations with a period shorter than 20 years. The flare component of the flux variability and a short-period component with a mean period of two years have been found. The latter are correlated with variations of the velocity centroid, supporting the reality of the short-period variations. It is likely that all the various types of variations are inherent to both Sgr B2(M) and Sgr B2(N), and represent a superposition of the variations occurring in each of these sources. There is an alternation of maxima of the emission from Sgr B2(M) and Sgr B2(N). |
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