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6dFGS Workshop, Epping 11 July 2003 Fred Watson (and the RAVErs)

The future of Schmidtery. at the AAO. 6dFGS Workshop, Epping 11 July 2003 Fred Watson (and the RAVErs). The future of Schmidtery. Overview What is RAVE? Science goals—why are we RAVEing? Instrumentation The RAVE’s progress A few other issues. What is RAVE?. RAdial Velocity Experiment

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6dFGS Workshop, Epping 11 July 2003 Fred Watson (and the RAVErs)

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  1. The future of Schmidtery at the AAO 6dFGS Workshop, Epping 11 July 2003 Fred Watson (and the RAVErs)

  2. The future of Schmidtery Overview What is RAVE? Science goals—why are we RAVEing? Instrumentation The RAVE’s progress A few other issues...

  3. What is RAVE? RAdial Velocity Experiment International collaboration—22 scientists in 11 nations All-sky survey of stellar velocities & metallicities 50 million stars, complete to I=15 (Biggest EVER) Enables true galactic archaeology Spawned from (now-defunct) space missions UK Schmidt Telescope and a northern counterpart Completely externally funded ($A, €, $US, ¥?) Public data-base; VO compliant

  4. Science goals Comparison with simulations of structure-growthwithin a CDM Universe (Steinmetz & Navarro, 2002) Substructure in the halo (cold stellar streams) Chemical signatures ([/Fe], [Fe/H]) to identifycommon formation sites among widely-separated stars Formation of bulges Origin of the thick disk Dynamical state of the thin disk and neighbouring spiral arms www.aip.de/RAVE/

  5. RAVE—the first new-millennium survey…

  6. Simulation of a galactic halo built up by accretion of 100 satellite galaxies The disrupted remnants can clearly be seen. Same simulation plotted in phase space, revealing the different orbits.

  7. More RAVEing Phase I: April 2003–June 2005, using unallocated UKST bright time during the 6dF Galaxy Survey 105 stars with I<13.5, B-V<0.8 Centred on Ca triplet:  8498Å, 8542Å, 8662Å in the far red region of the spectrum Currently measuring 700 stars per night Phase II: 2006–10, all UKST time once the Galaxy Survey is complete Will measure 22,000 stars per night

  8. The future of Schmidtery Instrumentation for RAVEing

  9. Phase I instrumentation: 6dF robot

  10. 6dFVPH Grating Parameters (with 100µm fibres) Grating Reciprocal Instrumental CCD Spectral dispersion resolution resolution range (Å/mm) (Å) (Å/pixel) (Å) 425R 169 6.6 2.20 5300-7600 580V 126 4.9 1.64 3900-5600 1201B 60 2.1 0.78 3600-4400 1700I 30 1.0 ~0.4 8415-8800 (All in 1st order)

  11. ECHIDNA Phase II instrumentation 6dF is too slow for 22,000 stars per night... Therefore adapt the 400-fibre positioner currently being developed by AAO for Subaru Echidna Ball-Spine Array

  12. Moduleassembly Top bridge Fibre cover Middle bridge Fibre spines and piezo actuators Module PCB Module base

  13. Echidna complete design Single module

  14. UKIDNA ECHIDNA Echidna for RAVE • 2250 spines (each with 15 arcmin patrol area) • Covers full field area of 6  6 deg2 • Feeds spectrograph with 3750 banks of spectra • Who builds the spectrograph? • AAO has go-ahead for a UKidna design-study • But UKidna will cost ~$A2M • How might it be funded?

  15. The MOMFOS story…

  16. The future of Schmidtery The RAVE’s Progress

  17. Implementation plan RAVE timeline 1.4.03 - 30.6.05 (2.25y): Phase 0/I (External staff required: 2.0FTE by 31.12.03) 1.7.05 - 31.12.05 (0.5y): UKidna installation/comm. 1.1.06 - 31.12.10 (5.0y): Phase II (External staff required: 6.0FTE by 1.7.05)

  18. 6dF observations 03A 6dFGS RAVE N/S Total Exp 2003 (flds) (flds) (flds) (flds) (hours) Jan/Feb 25 10 35 95.9 Feb/Mar 16 19 35 72.3 Mar/Apr 24 3 14 41 96.3 Apr/May 37 32 9 78 115.9 May/Jun 33 12 8 53 84.9 Jun/Jul* 37 21 2 60 80.5 Total 172 68 62 302 548.8 * to 2003 July 8/9

  19. VO-compliance Data-format: easy to make VO compliant (though AAO may adopt CADC format rather than VOtable) Metadata: robot-generated data, etc. already written to data headers, but observer data is not Log6dF will allow additional metadata to be aatached (observing conditions, weather data, field alignment quality, observer’s name, observer comments, etc. etc.)

  20. RAVE spectrum? $Avs. € $Avs.£ $Avs. $US $Avs. ¥

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