Observations of the H2O radio line in the sources W49 and Orion A

Details Observations of the H2O radio line in the sources W49 and Orion A Observations of the H2O radio line in the sources W49 and Orion A

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pazh....7..677v&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 7, Nov. 1981, p. 677-681.) Soviet Astronomy Letters, vol. 7, Nov.-Dec. 1981, p. 376-378

Astronomy and Astrophysics

Astronomy

1

Astronomical Spectroscopy, Hydrogen Clouds, Line Spectra, Molecular Clouds, Radio Sources (Astronomy), Water Masers, Emission Spectra, Nebulae, Radial Velocity, Radiant Flux Density, Radio Telescopes, Spectral Energy Distribution, Spectral Resolution

Scientific paper

1.35 cm H2O radio line profiles in the sources W49 and Orion A are presented. Observations were made with the Ratan-600, with the antenna beam measuring 11 arcsec x 3 arcmin at the altitude of these two sources. Readings are taken in each of the 39 channels of the spectrum analyzer every 0.125 sec, and are sidereal time synchronized using a standard frequency received by the radio telescope from the USSR Time Service. Source profile diagrams are presented, and a strong H2O emission in the core of the Kleinmann-Low nebula was detected at 7.3 km/sec radial velocity (1.3 km/sec lower than that of the 1979 flare). It is suggested by the 1.3 arcsec + or - 0.3 arcsec wavelength shift from the 1979 position that current observations are of a flare of a different H2O emission region in the same source. The radial velocity of the flare changed 0.12 + or - 0.02 km/sec between June 2 and June 3, 1981.

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