Statistical lensing in COSMOS
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Statistical lensing in COSMOS. Ludovic Van Waerbeke Department of Physics and Astronomy University of British Columbia. With: F. Bernardeau (CEA) Y. Mellier (IAP) E. Semboloni (IAP) & the COSMOS team. Weak lensing two-points statistics: What is measured?.

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Ludovic Van Waerbeke Department of Physics and Astronomy University of British Columbia

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Ludovic van waerbeke department of physics and astronomy university of british columbia

Statistical lensing in COSMOS

Ludovic Van Waerbeke

Department of Physics and Astronomy

University of British Columbia

With:

F. Bernardeau (CEA)

Y. Mellier (IAP)

E. Semboloni (IAP)

& the COSMOS team


Ludovic van waerbeke department of physics and astronomy university of british columbia

Weak lensing two-points statistics: What is measured?

<g2>~0.01 s82 W1.6 zs1.4 q-(n+2)/2

  • Mass power spectrum normalisation

  • Slope of the power spectrum

  • Mean density parameter

  • Redshift of the sources

Contaldi et al. 2004


Ludovic van waerbeke department of physics and astronomy university of british columbia

VIRMOS

I~24

Z~0.9

LVW et al.

COSMOS should reach ~ same accuracy with two major differences:

-followups. In particular photoz enables lenses selection, 3D lensing, etc…

-morphology

-depth enables high order statistics despite small FOV.


Ludovic van waerbeke department of physics and astronomy university of british columbia

redshift distributions based on the Hubble deep fields

25.<i<27.

Zphot~1.4


Ludovic van waerbeke department of physics and astronomy university of british columbia

Cycle 12 area Polygon masks (ds9 format) are available


Ludovic van waerbeke department of physics and astronomy university of british columbia

PSF anisotropy pattern averaged over cycle 12 chips


Ludovic van waerbeke department of physics and astronomy university of british columbia

Preliminary E and B modes aperture mass


Ludovic van waerbeke department of physics and astronomy university of british columbia

LCDM model with s8=0.8 and zS~1.4


Ludovic van waerbeke department of physics and astronomy university of british columbia

~30 stars per chip


Ludovic van waerbeke department of physics and astronomy university of british columbia

Needs image reprocessing with smaller pixel size?


Ludovic van waerbeke department of physics and astronomy university of british columbia

Star-gal shear aperture correlation


Ludovic van waerbeke department of physics and astronomy university of british columbia

Star-gal shear correlation function


Ludovic van waerbeke department of physics and astronomy university of british columbia

Strong lensing with R. Gavazzi (OMP, Toulouse)


Ludovic van waerbeke department of physics and astronomy university of british columbia

Inverse pixel mapping into the source plane

Singular IS

Zlens~0.4

Zsource~3

Re=1.58”

M~4.4x1011 Mo h70-1


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