Interpretation of absolute line intensities on the NRAO 11 meter and other millimeter wave telescopes

Details Interpretation of absolute line intensities on the NRAO 11 meter and other millimeter wave telescopes Interpretation of absolute line intensities on the NRAO 11 meter and other millimeter wave telescopes

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...283..890k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 283, Aug. 15, 1984, p. 890-894.

Astronomy and Astrophysics

Astronomy

27

Radio Sources (Astronomy), Radio Telescopes, Spectral Energy Distribution, Microwave Spectra, Millimeter Waves, Normal Density Functions

Scientific paper

A series of observations of the sun, moon, and planets (Venus, Mars, and Jupiter) has been made for the purpose of determining source coupling and aperture efficiencies on the NRAO 11 m telescope. Aperture efficiencies are presented as a function of frequency over the full operating range of the telescope, and the results are compared with Ruze theory. The main beam and diffraction sidelobes at several frequencies and the error pattern at 91 GHz have been mapped. A significant, nonaxially symmetric sidelobe structure was found at approximately the -11 dB level, within 3 arcmin of the beam center, which may have a significant effect of maps of sources with this angular scale. In fitting the overall beam structure, it is found that three Gaussians are necessary, with (at 91 GHz) FWHMs of 1.3, 10.0, and 44.0 arcmin, relative forward gains of 0.994, 4.0 x 10 to the -3rd, and 2.0 x 10 to the -4th, and 68, 16, and 16 percent of the total power, respectively.

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