Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976mnras.174p..69k&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 174, Mar. 1976, p. 69P-73P.
Astronomy and Astrophysics
Astronomy
6
Interstellar Masers, Molecular Spectra, Radial Velocity, Velocity Distribution, Water Vapor, Astronomical Spectroscopy, High Resolution, Hyperfine Structure, Microwave Emission, Radio Sources (Astronomy)
Scientific paper
Recent high-resolution water vapor observations are discussed which demonstrate that a number of strong 22-GHz H2O masers show evidence of a symmetrical radial-velocity structure in their spectra. These structures consist of one or more pairs of features separated by approximately equal radial-velocity displacements of 1 to 15 km/s from a central symmetry axis. The observed sources include H2O 285.3-0.1, H2O 331.0-0.2, W 51, M 17, the source associated with VY CMa, and Orion A. It is suggested that a symmetrical radial-velocity structure is a basic feature of many strong H2O sources and that the observed splitting in frequency is almost certainly due to emission from regions with different velocities.
Batchelor Richard A.
Knowles Stephen H.
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