Image of Alice in Wonderland at the Mad Hatter's tea party You are cordially invited to afternoon tea and biscuits wine and chocolate

Astronomy Tea Talks at Caltech

Mondays, Hameetman auditorium (Cahill)
Tea:  4.00pm
Talk: 4.15pm

Organized by:

2009 - 2010 season:
28 September 2009 Elinor Medezinski (Tel Aviv)

'The Full Strength of Cluster Lensing'

I show how to isolate background galaxy populations for a proper
weak-lensing measurements. Published work has suffered significant
contamination by cluster members which dilute the central weak-lensing
signal, leading to underestimated mass profiles. Accurate and reliable
cluster mass and light profiles are then constructed for several well
known clusters with deep multi-color Subaru data and HST/ACS
strong-lensing, well fitted by surprisingly high-concentration NFW
profiles and where M/L peaks at ~0.2 R_vir.
For the first time we demonstrate that the distant dropout population
has a higher weak-lensing signal than the blue and red populations of
background galaxies, from which we derive the lensing
distance-redshift relation for A370, ZwCl0024+17 and RXJ1347-11. Here
the depth of the background populations are estimated with reference
to the COSMOS 30-band survey of Ilbert et al, for which we can clarify
photometric redshift ambiguity.

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Last modified on 20th Jul 2011 by Dominik A. Riechers.  

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