The CFHT- Legacy Survey

Elisabetta SemboloniArgelander Institut für Astronomie

Terapix/Skywatcher : all data 03A-05A : 20000 Megacam images

W2D4

W3 & D3D2

The CFHTLS -Overview

HST Groth strip

GEMINI-N visibility

VLT visibility VLT visibility + XMM fields

VVDS spectro. survey

VLT visibility

+ HST-Cosmos VLT visibility +

Quasar fieldW1 & D1

W4 VVDSUKIDSS DXS

The CFHTL- Survey

u* g r i z

28.20

33h

28.20

33h

28.60

66h

28.30

132h

27.00

66h

4 uncorrelated fields:W1=72 deg²W2=49 deg²W3=49 deg²W4=25 deg²

Depth in the 5 colors:

The CFHTLS Wide

The CFHTLS Deep

4 uncorrelated fields1 degree² each

Depth in the 5 colors:

u* g r i z

26.40 26.60 25.90 25.50 24.80

The CFHTLS Status• First World Wide release on February 2007 ( data between June 1st, 2003 and May, 2005)

• T0004 release completed on June 2007 ( data between June 1st, 2003 and Oct. 24, 2006) Wide fields in the I band:

W1= 44,W2=33,W3= 44,W4=16 Wide fields in all bands:

W1=19, W2=0,W3=5,W4=11

• End of the survey: 2008

u* g r i Z

D1 26.0

30%

25.7

37%

26.2

40%

26.0 42%

25.2 38%

D2 25.7

3%

26.2 55%

26.1

26%

25.8 25%

25.0 23%

D3 26.1

26%

25.7

37%

26.5

42%

26.2 41%

25.3 44%

D4 26.1

38%

25.7

37%

26.4 47%

26.1 43%

25.2 50%

Scientific goals

Cosmic shear at very large scale (Wide) Galaxy-galaxy lensing (Wide) Evolution of shear signal (Deep)

Cluster of galaxies (Deep + Wide) Observation of high redshift Quasar (Deep) Stellar population (Wide) Stars movement (Wide) Morphologic classification of galaxies Galaxy evolution Supernovae Survey (Deep)

The CFHTLS & the cosmic shear

06.089.08

0P

8.00

Hoekstra et al. 2006

Semboloni et al. 2006

Schimd et al. 2006

Latest CFHTLS-Wide shear results

Work based on T0003 Wide release

First Shear measurement up to 4 degrees !!

Fu et al. in prep

CFHTLS Wide T0003 shear Results

Fu et al. in prep

WMAP 3rd year +CFHTLS Wide

llbert et al 2006

A short (incomplete) summary ofthe science possible the CFHTLS

Astier et al 2006

I

Parker et al 2007

….more at https://cfht.hawaii.edu/Science/CFHTLS/cfhtlspupblications.htm

The future of the CFHTLS ?• The CFHTLS will be ended in 2008 Wircam and Megacam shown their performance and

they could be employed for a 3 year new program

Several options possible: - Wide shallow survey i=23.3, A=4600 deg² (no need of

infrared ) - Deep survey i=25.2, A=80 deg² (Wircam follow up ) - Just focus on the follow up on the infra-red follow up of

the CFHTLS-1 Many option but nothing has been still decided