具有200 GHz频带边带分离SIS接收机的新型60厘米射电测量望远镜
New 60-cm Radio Survey Telescope with the Sideband-Separating SIS Receiver for the 200 GHz Band
摘要：
我们已经升级了位于日本野边山的60厘米射电观测望远镜。我们开发了一种新的波导型边带分离SIS混频器的望远镜，它使不同的分子发射线的同时检测在上下边带。在205-240 GHz的RF频率范围内，对于4.0-8.0 GHz的IF频带，新混频器的单边带接收机噪声温度为40-100 K。镜像抑制比在相同范围内大于10 dB。对于接收机获得的双中频信号，我们研制了两套声光频谱仪和一套望远镜控制系统。2005年3月，我们利用新的望远镜系统成功地同时探测到了猎户座KL的12 CO（J=2-1）和13 CO（J=2-1）发射线。使用波导型边带分离SIS混频器的200 GHz频段，我们已经开始了第一次同时12 CO（J=2-1）和13 CO（J=2-1）调查的银道面以及附近的分子云的大规模测绘观测。
英文摘要：
We have upgraded the 60-cm radio survey telescope located in Nobeyama, Japan. We developed a new waveguide-type sideband-separating SIS mixer 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, we have developed two sets of acousto-optical spectrometers and a telescope control system. Using the new telescope system, we 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, we have 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.
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