1. 30/6/09 Unity of the Universe 1

2. Michael Drinkwater for the team Australia: Blake, Brough, Colless, Couch, Croom, Davis, Glazebrook, Jelliffe, Jurek, Li, Pimbblet, Poole, Pracy, Sharp, Wisniosiki U.S.A.: Foster, Gladders, Madore, Martin, Small, Wyder Canada: Gilbank, Woods, Yee The WiggleZ Dark Energy Survey 30/6/09 2 Unity of the Universe 1. Motivation 2. Design & Progress 3. Large Scale Structure Results 4. Other Results

3. 1. Motivation 30/6/09 Unity of the Universe 3 Need to sample around redshift z=0.6 when acceleration starts Survey aims: Measure BAO scale to 2% in a sample of 240,000 galaxies at 0.3<z<0.9 Measure w to 10% to independently validate constant dark energy model

4. Motivation 30/6/09 Unity of the Universe 4

5. 2. Design & Progress 30/6/09 Unity of the Universe 5 GALEX satellite imaging UV-selected galaxies Medium Imaging Survey extended NUV < 22.8 Optical imaging: r < 22.5 SDSS (North) RCS2 survey on CFHT (South) AAT’s new AAOmega fibre spectrograph 220-night large project Measure 240,000 redshifts Star forming galaxies Emission line redshifts in short 1-hour exposures

6. Example spectra 30/6/09 Unity of the Universe 6 Quality = 5 (high) Redshift z=0.57 R = 21.4 mag Quality = 3 (acceptable) Redshift z=0.86 R = 21.2 mag

7. Survey coverage 30/6/09 Unity of the Universe 7

8. Design Improvements 30/6/09 Unity of the Universe 8 New spectrograph beam splitter Moved spectra 100 nm to the red More reliable redshifts Optical Colour Selection Increased median redshift to z med =0.6

9. Survey Status 30/6/09 Unity of the Universe 9 Progress Observations ¾ done Scheduled to run 2006 to 2010 August Over 140,000 galaxies measured Have doubled the number of known z>0.5 galaxies from the two largest existing surveys (DEEP2 & VIMOS) Galaxies in the 15-hour WiggleZ field… to 3.3 Gpc distance

10. 3. Large scale clustering results 30/6/09 Unity of the Universe 10 The 2dF control system…

11. WiggleZ power spectrum 30/6/09 Unity of the Universe 11 By Chris Blake 5% accuracy in dk = 0.01 bins Linear model is good fit to k = 0.3

12. WiggleZ power spectrum 30/6/09 Unity of the Universe 12 By Chris Blake Divided by reference model with BAO signal removed. Model divided by reference Model convolved with survey window

13. Cosmological Parameters 30/6/09 Unity of the Universe 13 By Chris Blake

14. Predicted final sensitivity 30/6/09 Unity of the Universe 14 By Tamara Davis Predicted precision in measurement of (w const, Ω M ) combined with supernovae

15. 4. Other results 30/6/09 Unity of the Universe 15 Small scale clustering (Blake et al. 2009) UV luminosity function (Russell Jurek’s PhD) Growth of structure (Carlos Contreras’ PhD) Super starburst galaxies (Emily Wisnioski’s PhD) Future work Neutrino mass Galaxy bispectrum Genus statistic Homogeneity scale of Universe (vs LTB models)

16. Small scale clustering 30/6/09 Unity of the Universe 16 By Chris Blake

17. Small scale clustering 30/6/09 Unity of the Universe 17 By Chris Blake

18. The UV galaxy luminosity function N=9356 (photo-z) N=1869 N=1039 N=2976 WiggleZ N=47,747 30/6/09 18 Unity of the Universe Russell Jurek’s PhD First ever sample of bright end of UV luminosity function

19. 30/6/09 Unity of the Universe 19 Russell Jurek’s PhD M NUV -18 -20 -22 0.2 0.6 1.0 redshift (z) 0.01 0.02 0.03 Fraction of universal star formation density WiggleZ galaxies have the highest SF at any redshift Their contribution peaks at z≈0.6 UV contribution to star formation

20. Growth of structure 30/6/09 Unity of the Universe 20

21. Super starburst galaxies 30/6/09 Unity of the Universe 21

22. Neutrino Mass 30/6/09 Unity of the Universe 22 By Chris Blake Advantage of WiggleZ Galaxies less strongly clustered than LRGs Higher redshift Better power spectrum measurement Have many more Fourier scales before it goes non linear Non-linear growth of structure

23. Summary 30/6/09 Unity of the Universe 23 Aims of WiggleZ Survey the largest ever volume of the z>0.5 Universe 240,000 galaxies in 1 Gpc 3 Measure BAO scale to 2% Measure constant w to 10% BAO not measured until observations finish 2010 May Many other science applications The technology behind WiggleZ: 2dF positioning fibres on the AAT

24. 2dF on a bad day 30/6/09 Unity of the Universe 24 Note the special error message: “Too many errors.”