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Upgrades of the 45m Telescope Observing System

We, the 45-m telescope group, are developing a new observing system to improve the performance of the 45-m telescope. The system consists of a new receiver, new IF converters, new A/D converters and a new spectrometer. We adopted new technologies for each part. Especially, the technologies developed for ALMA (Atacama Large Millimeter/submillimeter Array) were used for many parts (e.g., receiver and spectrometers). We succeessfuly detected a signal from a celestial object with the new system last November and the signal from a galaxy whose distance is about 550 million light years in March this year. With the new system, we expect to find distant primeval galaxies and various molecules in interstellar space.

This article is based on a presentation given at the ASJ Spring 2010 Meeting.

Fig .1 The new 2-beam receiver TZ
Fig.2 CO emission from Mrk231 (550 million light year) detected by new observing system (Horizontal axis: Velocity,  Vertical axis: Temperature).