VLBI observations of the H2O masers in Sagittarius B2

Details VLBI observations of the H2O masers in Sagittarius B2 VLBI observations of the H2O masers in Sagittarius B2

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...241.1007e&link_type=abstract

Astrophysical Journal, Part 1, vol. 241, Nov. 1, 1980, p. 1007-1013.

Astronomy and Astrophysics

Astrophysics

25

Galactic Nuclei, Interstellar Masers, Molecular Clouds, Very Long Base Interferometry, Water Masers, Astrometry, Interstellar Matter, Sagittarius Constellation

Scientific paper

A two-station VLBI experiment was used for the mapping of 33 velocity features of the H2O emission at 1.35 cm wavelength from Sagittarius B2 with an accuracy of 4 milliarcsec. The masers originate in three space groups spaced by 44 in. in the north-south direction; the middle and southern sources coincide with the principal OH maser sources. The 30 features in the northern and middle sources indicate that the middle source masers originate from an expanding or contracting envelope with a radial velocity gradient; the envelope may be the gravitationally collapsing core of the Sagittarius B2 cloud. The pattern of maser emission is symmetric; the middle source is at the midpoint of a line joining the northern and southern sources; the middle source features are almost exactly at the centroid of the emission.

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