Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001crlrv..47...73o&link_type=abstract
Review of the Communications Research Laboratory, vol. 47, p. 73
Astronomy and Astrophysics
Astronomy
Spectral Emission, Radio Astronomy, Radiometers, Fabrication, Water Masers, Thermal Emission, Active Galaxies, Water Vapor, Systems Engineering, Switching, Parabolic Reflectors, Microwave Frequencies, Continuous Radiation, Atmospheric Attenuation
Scientific paper
For radio astronomy observations, 22GHz is an important observation frequency band because of the H2O maser-line-spectrum emissions from the active regions in galaxies. But, for continuous-wave observations, use of the 22GHz band has distinct disadvantages. Non-thermal emissions generally become weaker in the higher range of microwave frequencies and the larger water vapor atmospheric absorption and emission causes a decrease of signals from radio sources and increases of antenna noise. That results in the erasure of the weak signal from the radio source. Consequently, 22GHz continuous wave observation is more difficult than lower frequency observation. For single-dish observations of continuous-wave radio sources, we have been developing a Dicke-type switching radiometer. In this paper, we report the system configuration and results of experiment observations using a reference radio source.
Kawai Eiji
Koyama Yasuhiro
Okubo Hiroshi
Sekido Mamoru
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