Physics
Scientific paper
Dec 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977natur.270..501l&link_type=abstract
Nature, vol. 270, Dec. 8, 1977, p. 501.
Physics
29
Galactic Radiation, Microwave Spectra, Radio Emission, Radio Galaxies, Water Vapor, Hydroxyl Emission, Radial Velocity, Radiant Flux Density
Scientific paper
This letter reports the detection of the 6(16) - 5(23) transition of water vapor at 22.235 GHz in NGC 253, a large edge-on spiral galaxy located at a distance of 3.4 Mpc. The observations were performed using a double-sideband balanced-mixer receiver with a system temperature of about 1000 K and a 46-channel filter bank having a resolution of 100 kHz. An H2O spectrum of NGC 253 is presented which exhibits an emission feature of 5.2 (plus or minus 1.2) Jy at a radial velocity of 233 km/s. It is suggested that this emission feature may be associated with 1667-MHz OH emission previously observed at 239 km/s. The intrinsic power of the H2O emission at 233 km/s is shown to be about three times greater than that of W49 during its maxima.
Lépine Jacques R. D.
Marques Dos Santos P.
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