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The WiggleZ Dark Energy Survey

The WiggleZ Dark Energy Survey. 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.

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The WiggleZ Dark Energy Survey

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  1. Unity of the Universe

  2. The WiggleZ Dark Energy Survey 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 Motivation Design & Progress Large Scale Structure Results Other Results Unity of the Universe

  3. 1. Motivation • 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 Unity of the Universe

  4. Motivation Unity of the Universe

  5. 2. Design & Progress • 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 Unity of the Universe

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

  7. Survey coverage Unity of the Universe

  8. Design Improvements • New spectrograph beam splitter • Moved spectra 100 nm to the red • More reliable redshifts • Optical Colour Selection • Increased median redshift to zmed=0.6 Unity of the Universe

  9. Survey Status Galaxies in the 15-hour WiggleZ field… to 3.3 Gpc distance • 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) Unity of the Universe

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

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

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

  13. Cosmological Parameters Unity of the Universe By Chris Blake

  14. Predicted final sensitivity Predicted precision in measurement of (wconst, ΩM) combined with supernovae Unity of the Universe By Tamara Davis

  15. 4. Other results • 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) Unity of the Universe

  16. Small scale clustering Unity of the Universe By Chris Blake

  17. Small scale clustering Unity of the Universe By Chris Blake

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

  19. UV contribution to star formation MNUV -18 -20 -22 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 0.2 0.6 1.0 redshift (z) Unity of the Universe Russell Jurek’s PhD

  20. Growth of structure Unity of the Universe

  21. Super starburst galaxies Unity of the Universe

  22. Neutrino Mass • 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 Unity of the Universe By Chris Blake

  23. The technology behind WiggleZ: 2dF positioning fibres on the AAT Summary • Aims of WiggleZ • Survey the largest ever volume of the z>0.5 Universe • 240,000 galaxies in 1 Gpc3 • Measure BAO scale to 2% • Measure constant w to 10% • BAO not measured until observations finish 2010 May • Many other science applications Unity of the Universe

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

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