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

The ASTE site

FTS measurement Matsushita et al. 1999

ASTE Bands

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

Climbing the most difficult hill

• Almost there, but still hard to go…

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

- Posters -