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A New 21-cm Line Survey of the LMC

Published online by Cambridge University Press:  04 August 2017

K. Rohlfs ,
J. Kreitschmann  and
J. V. Feitzinger
K. Rohlfs
Affiliation:
Astronomisches Institut der Ruhr-Universität, FRG-4630 Bochum 1
J. Kreitschmann
Affiliation:
Astronomisches Institut der Ruhr-Universität, FRG-4630 Bochum 1
J. V. Feitzinger
Affiliation:
Astronomisches Institut der Ruhr-Universität, FRG-4630 Bochum 1

Extract

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The measurements were made in Feb. 1982 with the Parkes 64 m telescope using a corrugated waveguide horn with total half-power beam width of 15′, the first sidelobes being 19 dB down, resulting in an aperture efficiency ηA=0.53±0.007, a main beam efficiency of ηmb=0.80±0.005 and a ratio of source flux to antenna temperature of Γ=0.62±0.1 K/Jy (Murray, priv. comm.). A cooled two channel FET frontend used in the frequency switching mode with Δν = 2 MHz resulted in a system noise temperature at zenith of Tsyst = 40 K for one channel and Tsyst = 50 K for the other. Each frontend channel received a single polarization mode, and this radiation was then further analysed in a 2 × 512 channel autocorrelation spectrometer set at a channel separation of 3.906 KHz corresponding to a velocity resolution of V = 0.824 km s−1. Hanning smoothed this resulted in a σT = 0.05 K for the average of both polarization.

Type
Interstellar Matter
Information
Symposium - International Astronomical Union , Volume 108: Structure and Evolution of the Magellanic Clouds , 1984 , pp. 395 - 396
Copyright
Copyright © Reidel 1984 

References

Feitzinger, J.V., 1980, Space Sci Rev. 27, 35 Google Scholar
Isserstedt, J., 1975, Astron. Astrophys. 41, 21 Google Scholar