Unity of the Universe
This presentation is the property of its rightful owner.
Sponsored Links
1 / 24

The WiggleZ Dark Energy Survey PowerPoint PPT Presentation


  • 34 Views
  • Uploaded on
  • Presentation posted in: General

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.

Download Presentation

The WiggleZ Dark Energy Survey

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


The wigglez dark energy survey

Unity of the Universe


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

Motivation

Design & Progress

Large Scale Structure Results

Other Results

Unity of the Universe


1 motivation

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


Motivation

Motivation

Unity of the Universe


2 design progress

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


Example spectra

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


Survey coverage

Survey coverage

Unity of the Universe


Design improvements

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


Survey status

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


3 large scale clustering results

3. Large scale clustering results

The 2dF control system…

Unity of the Universe


Wigglez power spectrum

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


Wigglez power spectrum1

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


Cosmological parameters

Cosmological Parameters

Unity of the Universe

By Chris Blake


Predicted final sensitivity

Predicted final sensitivity

Predicted precision in measurement of (wconst, ΩM) combined with supernovae

Unity of the Universe

By Tamara Davis


4 other results

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


Small scale clustering

Small scale clustering

Unity of the Universe

By Chris Blake


Small scale clustering1

Small scale clustering

Unity of the Universe

By Chris Blake


The uv galaxy luminosity function

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


Uv contribution to star formation

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


Growth of structure

Growth of structure

Unity of the Universe


Super starburst galaxies

Super starburst galaxies

Unity of the Universe


Neutrino mass

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


Summary

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


2df on a bad day

2dF on a bad day

Note the special error message: “Too many errors.”

Unity of the Universe


  • Login