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New 45M Radio Telescope and Fourier-Transform Type Spectrometer at Nobeyama Radio Observatory

Published online by Cambridge University Press:  04 August 2017

Hisashi Hirabayashi
Hisashi Hirabayashi*
Affiliation:
Nobeyama Radio Observatory, Tokyo Astronomical Observatory, University of Tokyo Nobeyama, Minamisaku Nagano, 384-13 Japan

Abstract

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The 45m radiotelescope of Nobeyama Radio Observatory (NRO) is now in operation. It has a surface accuracy of 0.2 mm (rms) and a pointing accuracy of 0.001 degrees. Two types of spectrometers were designed for the telescope. One type is an Acousto-Optical-Spectrometer (AOS) with a 16,384 channel, 2000 MHz full-bandwidth spectrometer, and a 8192 channel, 160 MHz full-bandwidth spectrometer. The other type is a direct Fourier transform type spectrometer called “FX”. One FX is designed for a 10 meter, 5 element supersynthesis interferometer and another for the 45m radio telescope. The “interferometer FX” is a spectro-correlator that processes 5 inputs of 320 MHz bandwidth signals into correlations with 1024 frequency channels. The “45m FX” has 4 sets of 10 MHz bandwidth, 1024 channel spectrometers.

It has been pointed out by Morimoto, Hirabayashi, and Jugaku (1978) that formaldehyde anti-maser absorption lines in the direction of dark clouds would be suitable for SETI (Search for Extra-Terrestrial Intelligence). The Nobeyama 45m radiotelescope is suited for such targeted deep SETI.

Type
Section VI. Technological Progress in Radio Searches
Information
Symposium - International Astronomical Union , Volume 112: The Search for Extraterrestrial Life: Recent Developments , 1985 , pp. 425 - 433
Copyright
Copyright © Reidel 1985 

References

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