ASTE Atacama Submillimter Telescope Experiment Hajime Ezawa National Astronomical Observatory of Japan ASTE Team National Astronomical Observatory of Japan The University of Tokyo (IoA & Dept. of Physics) Nagoya University Osaka-pref. University Universidad de Chile

The ASTE Project Install and Operate a 10-m submillimeter telescope at the one of the best observing site in nothern Chile. Explore the southern sky with submillimeter waves On-site evaluation of methods & techniques for submm. obs. –High precision antenna, high sensitivity submm. RX –Remote operation system Provide opportunity for young students to study observation and instrumentation for submillimeter astronomy

The ASTE Site Located at alt. 4,800 m in the Atacama desert in northern Chile CBI, APEX, NANTEN2, ALMA, RLT, …. in vicinity

The ASTE site FTS measurement Matsushita et al ASTE Bands

Fabrication and installation To Chile Fabrication in San P. de Atacama↑ Jan.-Mar., 2002 Final Position To 4,800 m telescope site March, 2002 Initial installation in Nobeyama →

Climbing the most difficult hill Almost there, but still hard to go…

Telescope Satellite Comunication Observing Room Generators & Fuel tanks Satellite telephone Oxygen cylinders & compressors Safety rules (ex. time limit) Alt. 4,800 m = 570 hPa Safety equipments including

The Antenna (1) The Antenna: –10 m diameter –Surface Accuracy < 20  m –Adjustable 205 Al panels –BUS of CFRP and Invar High accuracy encoder ~0.03” rms Sub-reflector –Mounted on Steward platform –Wobbling capability Optical telescope –Mounted on telescope structure

The Antenna (2) Telescope Transmitter For Holography Current surface accuracy = 18.9  m r.m.s. Relative Pointing Accuracy 1.2” for AZ, EL

Receivers & Spectrometer SIS heterodyne Receivers Cartridge type RX (4 K) 345 GHz, 500 GHz, 800 GHz Tsys = 200 K 345 GHz CO(J=7-6)Ori-KL Continuum Receivers 3-band bolometer mainly for antenna evaluation (350, 650, 850 GHz) Submillimter Camera array of SIS direct photon detectors at 650 GHz (Matsuo et al. 2004) 345 GHz RX Spectrometer Four XF type auto-corelators 1024 ch for 512 or 128 MHz BW Spectrometer Sugimoto et al. 2004

Holography TX Satellite Link 56~64 kbps San Pedro de Atacama (Base Facility, 2400 m) Power Generators Telescope Site (Alt m) Santiago (U. de Chile) Internet Japan (NAOJ and Univ’s) Operation & Control Remote control through narrow band-width connection Operation possible from multiple sites (incl. overseas)

Latest Results CO(3-2) towards M83 5 arcmin CS(7-6) towards NGC 3576 Yamaguchi et al.  4.81 Muraoka et al.  4.51 Outflows from IRS 4 Hiramatsu et al.  4.30 Cha MMS1 IRS 4 IRS 6

Summary 10 m submillimeter telescope ASTE is now in operation at Pampa la Bola Antenna shows good specification including surface accuracy of 18.9  m r.m.s. Cartdridge type 345 RX realizing Tsys= GHz Telescope is remote-controllable from multiple sites through satellite connection and internet. Following the evaluation phase, astronomical observation has been performed since Hiramatsu et al. (4.30) YSO-close-packed region Cederbald 110 Mizuno et al. (4.48) Magellanic clouds Moriguchi et al. (4.50) TeV Gamma-ray SNR G Muraoka et al. (4.51) Disk region of the barred spiral galaxy M 83 Yamaguchi et al. (4.81) Southern massive star-forming regions - Posters -