Some results of 22-year monitoring (1982 2003) of Sagittarius B2 in the 1.35-cm line

Details Some results of 22-year monitoring (1982 2003) of Sagittarius B2 in the 1.35-cm line Some results of 22-year monitoring (1982 2003) of Sagittarius B2 in the 1.35-cm line

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004arep...48..965l&link_type=abstract

Astronomy Reports, vol. 48, Issue 12, p.965-978

Astronomy and Astrophysics

Astronomy

1

Scientific paper

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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