ASTE Atacama
Submillimter
Telescope
Experiment
Hajime EzawaNational 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
Fabrication and installation
To Chile
Fabrication in San P. de Atacama↑
Jan.-Mar., 2002
Final Position
To 4,800 m telescope siteMarch, 2002
Initial installation in Nobeyama →
2000 - 2001
Telescope
SatelliteComunication
ObservingRoom
Generators & Fuel tanks
• Satellite telephone• Oxygen cylinders & compressors• Safety rules (ex. time limit)
Alt. 4,800 m = 570 hPaSafety 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
TransmitterFor Holography
Current surface accuracy = 18.9 m r.m.s.
RelativePointing Accuracy1.2” for AZ, EL
Receivers & SpectrometerSIS heterodyne Receivers
Cartridge type RX (4 K)
345 GHz, 500 GHz, 800 GHz
Tsys = 200 K ! @ 345 GHz
CO(J=7-6) Ori-KLContinuum Receivers• 3-band bolometer mainly for antenn
a 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. 4800 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 ar
cmin
CS(7-6) towards NGC 3576Yamaguchi et al. 4.81
Muraoka et al. 4.51
Outflows from IRS 4
Hiramatsu et al. 4.30Cha 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 accur
acy of 18.9 m r.m.s.• Cartdridge type 345 RX realizing Tsys=200 K @ 345 GHz• Telescope is remote-controllable from multiple sites throug
h satellite connection and internet.• Following the evaluation phase, astronomical observation
has been performed since 2003.
Hiramatsu et al. (4.30) YSO-close-packed region Cederbald 110Mizuno et al. (4.48) Magellanic cloudsMoriguchi et al. (4.50) TeV Gamma-ray SNR G347.3-0.5Muraoka et al. (4.51) Disk region of the barred spiral galaxy M 83Yamaguchi et al. (4.81) Southern massive star-forming regions
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