The FMOS Facility for the SUBARU telescope Gavin Dalton Oxford/RAL.

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Presentation transcript:

The FMOS Facility for the SUBARU telescope Gavin Dalton Oxford/RAL

Overview of F ibre M ulti O bject S pectrograph project for the Subaru telescope Masayuki Akiyama (Subaru Telescope, NAOJ) on behalf of FMOS team (P.I. Toshinori Maihara)

FMOS: instrument overview

FMOS: project overview

FMOS: prime-focus corrector Prime-focus corrector designed and fabricated by AAO Three BSM51Y design with F/2.0 and 30arcmin diameter FoV. Image quality optimized between micron

If we put 400 magnetic buttons with fibres (like 2dF) on the prime-focus of the Subaru telescope, it would be like,,, So we need new fibre positioning method for FMOS… FMOS: fibre positioner 145mm = 30arcmin

FMOS:Echidna: 1998 Birth of Echidna concept Concept by Peter Gillingham (AAO) shown at Tiling the focal plane with 400 of them = 7mm x 7mm each

FMOS:Echidna: Long-term development effort 1998 Echidna with “Nano-motor” 2000 Echidna with “ball-spine” design 1999 Echidna with “inch-worm” design

FMOS:Echidna: 2001 Final design fixed “Stick-and-slip” motion with sawtooth voltage signal

FMOS:Echidna: Under testing in Hilo Focal plane with 480 fibres.

FMOS:Echidna: Under testing in Hilo Focal plane imager.

FMOS:Echidna: Under testing in Hilo Positioner unit SEE ECHIDNA THE MOVIE !!

Movies

FMOS:Echidna: test results so far Focal plane imaging camera tested. Positions of 400 fibres in 154mm FoV can be measured with 2-3micron r.m.s. accuracy. Configuration accuracy of 10micron (corresponds to 0.12 arcsec. Fibre core is 100micron, i.e. 1.2”) can be achieved for >95% of the 400 fibres with 7 iterations in 11minutes. Fibre tip is 30micron r.m.s. from the focal plane.

FMOS: prime-focus unit (PIR) New prime focus unit with instrument focusing unit (Z-movement) corrector lens adjustment mechanism (XY-movement) cable wrapping unit for FMOS is constructed by Kyoto Univ. and Mitsubishi.

FMOS:PIR+Echidna under testing NOW

FMOS: fibre train with connector Fibre trains with 120mm 200 fibres/slit strain relief boxes F2/F5 conversion air connector fibre back illumination system was designed and fabricated in Durham. F2-side fibre F5-side fibre

FMOS: fibre train with connector N.B. some of the tolerances on these lenses turn out to be difficult!

How to map ECHIDNA to spectrographs?

FMOS: fibre train with connector A lot of attention has been paid to cable management!

The FMOS Spectrographs Gavin Dalton Oxford/RAL

2 bench-mounted spectrographs (total slit length is ~700 arcseconds). Optics cooled to ~200K, with articulated cryogenic cameras OH suppression by masking lines at intermediate focus. Full ZYJH wavelength coverage in 4 shots at suppression resolution Full coverage in 1 shot through redispersing VPH grating Spectrograph outline

Can work between the lines, but then we start to run out of pixels to do anything useful with this wonderful wide field! Because the IR sky is rather nasty… Why OH Suppression?

Accomodation Issues No space for systems of this size in any convenient location Extra floor added to Subaru enclosure on IR side above the Nasmyth platform Limited access (spectrogaphs must be assembled in situ) Cost…

Spectrograph Design

Predicted performance

Installation (two weeks ago)

FMOS Commissioning Schedule Near future mile-stones (first discussions on this project were 01/97!) 2007/10 Transfer IR prime-focus unit (PIR) and Echidna fibre positioner to summit 2007/12 Engineering observations of IR prime-focus unit Check image quality Check Auto-Guiding/Shack Hartmann system 2008/01 Engineering observation of Echidna fibre positioner Check positioning accuracy (spectrographs available) 2008/02 Start engineering observation with two spectrographs 2008/?? Open use observation with shared risk mode/GTO

So what can we do? 20 nights GTO: Galaxy evolution survey, ~15000 ‘good’ spectra from e.g. UDS (Interesting possibility would be to cover the DEEP2 AEGIS area?). Opportunity for a large programme (few x 10 5 redshifts). –See Totani’s talk. Whatever else comes up?