VLBI observations of the H2O masers in Sagittarius B2

Abstract

view Abstract Citations (27) References (35) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS VLBI observations of the H2O masers in Sagittarius B2 Elmegreen, B. G. ; Genzel, R. ; Moran, J. M. ; Reid, M. J. ; Walker, R. C. Abstract 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. Publication: The Astrophysical Journal Pub Date: November 1980 DOI: 10.1086/158414 Bibcode: 1980ApJ...241.1007E Keywords: Galactic Nuclei; Interstellar Masers; Molecular Clouds; Very Long Base Interferometry; Water Masers; Astrometry; Interstellar Matter; Sagittarius Constellation; Astrophysics full text sources ADS |