Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008asthe.101...18n&link_type=abstract
The Astronomical Herald (ISSN 0374-2466), Vol. 101, No. 1, p. 18 - 28 (2008)
Astronomy and Astrophysics
Astronomy
Radio Telescopes
Scientific paper
The 60-cm radio survey telescope located in Nobeyama, Japan, has been upgraded. A new waveguide-type sideband-separating SIS mixer was developed for the telescope, which enables the simultaneous detection of distinct molecular emission lines both in the upper and lower sidebands. Over the RF frequency range of 205-240 GHz, the single-sideband receiver noise temperatures of the new mixer are 40-100 K for the 4.0-8.0 GHz IF frequency band. The image rejection ratios are greater than 10 dB over the same range. For the dual IF signals obtained by the receiver, two sets of acousto-optical spectrometers and a telescope control system have been developed. Using the new telescope system, the author successfully detected the 12CO (J = 2 → 1) and 13CO (J = 2 → 1) emission lines simultaneously toward Orion KL in 2005 March. Using the waveguide-type sideband-separating SIS mixer for the 200 GHz band, the author has initiated the first simultaneous 12CO (J = 2 → 1) and 13CO (J = 2 → 1) survey of the galactic plane as well as large-scale mapping observations of nearby molecular clouds is .
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