Observations of the W51 H2O source with the Crimea-Haystack radio interferometer

Details Observations of the W51 H2O source with the Crimea-Haystack radio interferometer Observations of the W51 H2O source with the Crimea-Haystack radio interferometer

Feb 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978pazh....4...57m&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 4, Feb. 1978, p. 57-63.) Soviet Astronomy Letters, vol. 4, Jan.-Feb. 1978, p. 29-32. Tr

Astronomy and Astrophysics

Astronomy

Hydrogen Clouds, Infrared Astronomy, Interstellar Masers, Radio Interferometers, Water Masers, Astronomical Observatories, Autocorrelation, Cross Correlation, Nebulae, Optical Thickness, Radial Velocity

Scientific paper

Results are reported for measurements of the structure of the H2O source W51 M which were performed in February 1976 with the Crimea-Haystack radio interferometer at a wavelength of 1.35 cm and an angular resolution of 0.00038 arcsec. The autocorrelation and cross-correlation spectra of the source are presented; the source is shown to have a complex spectrum consisting of a large number of narrow-band features, the brightest of which are concentrated in the radial-velocity range from 55 to 72 km/s. Evidence that the emission from W51 M originates in three main zones of activity is discussed, and a complex structure is suggested for the emission region at 55 km/s. Four main features are found to comprise the spectrum of the interference signal for the region at 55 km/s. The observations are interpreted in terms of a model consisting of two compact activity centers separated by an angular distance of 0.020 arcsec and radiating in the respective radial-velocity ranges from 61 to 71.5 km/s and from 54 to 57 km/s.

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