The CFHT Stripe 82 Survey (CS82)
The CFHT Stripe 82 Survey (CS82)
The CFHT Stripe 82 Survey (CS82)
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<strong>The</strong> <strong>CFHT</strong> <strong>Stripe</strong> <strong>82</strong> <strong>Survey</strong> (CS<strong>82</strong>)<br />
No Cl’s in this talk<br />
Alexie Leauthaud, Jean-Paul Kneib, Ludovic van Waerbeke,<br />
Martin Makler, and the CS<strong>82</strong> collaboration
CMB-Galaxy Lensing Cross-correlations<br />
κ=Σ/Σcrit<br />
Σcrit~DS/DLDLS<br />
Σ=surface mass<br />
density<br />
• Amplitude of power<br />
spectrum at ZL<br />
• R=(DL-CMB DG)/(DLG DCMB)<br />
Das et al. 2008<br />
with: Sudeep Das, Eric Linder, Charlotte Welker<br />
DLG<br />
DL<br />
DG<br />
DL-CMB<br />
DL<br />
DCMB
CS<strong>82</strong> in a nutshell<br />
170 MegaCam (1 sq.degree) pointings with slight overlaps<br />
Same area as <strong>CFHT</strong>LS wide field !!<br />
Mostly between -40
1<br />
0<br />
1<br />
DEC<br />
1<br />
0<br />
1<br />
Imaging :<br />
Where is <strong>Stripe</strong> <strong>82</strong> ?<br />
40 20 0 20 40 60<br />
RA Spectroscopy :<br />
<strong>Stripe</strong> <strong>82</strong> SDSS imaging (ugriz, i
10<br />
8<br />
6<br />
4<br />
2<br />
CS<strong>82</strong> observing conditions<br />
0<br />
0.3 0.4 0.5 0.6 0.7 0.8 0.9<br />
CS<strong>82</strong> seeing<br />
CS<strong>82</strong> mean seeing = 0.6”<br />
Good for kappa maps with galaxy lensing
CS<strong>82</strong> Redshift Distribution<br />
1.0<br />
0.8<br />
0.6<br />
0.4<br />
0.2<br />
0.0<br />
0.0 0.5 1.0<br />
Redshift<br />
1.5<br />
Galaxy ‘regular’ lensing<br />
CS<strong>82</strong> galaxies for lensing<br />
CMB lensing<br />
Predicted:<br />
7 sigma detection
Observing strategy<br />
Observing<br />
strategy such<br />
that we have<br />
tried to avoid<br />
massive stars
CS<strong>82</strong> timeline: fast track<br />
Proposal accepted spring 2010<br />
Observations from August 2010 to January 2011,<br />
service mode observations insuring good seeing for the<br />
survey (seeing
Mask making: done!<br />
Stellar halos<br />
Asteroids/image<br />
defects<br />
Diffraction<br />
spikes
What I will show you next time .....<br />
z=0.4 cluster, Ngal~15
[ M O•<br />
pc -2 ]<br />
Yes, we have strong lensing signals ...<br />
10 3<br />
10 2<br />
10<br />
1<br />
0.1<br />
10 -2<br />
N lens: 5209<br />
z: 0.55 galaxy-galaxy lensing<br />
0.1 1<br />
R [ Mpc ]<br />
around a sample of<br />
spectroscopic lens<br />
galaxies at z=0.5 from<br />
BOSS
Summary<br />
CS<strong>82</strong>: “traditional”weak lensing survey, 170 deg 2<br />
Covers <strong>Stripe</strong> <strong>82</strong> - overlaps with ACT<br />
In the process of making kappa maps<br />
CMB-galaxy lensing cross-correlations<br />
Stay tuned!
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