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Astronomy Tea Talks at Caltech

Mondays, Robinson 106
Tea:  4.00pm
Talk: 4.15pm

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2007 - 2008 season:
19 November 2007 Graham Smith (Birmingham)

"Early results from the local cluster substructure survey"


Gravitational lensing has long been recognized as a powerful tool for
mapping the distribution of dark matter in clusters, and yet until
recently, it has only been applied routinely to individual clusters. I
will show that recent results are changing this picture; both strong
and weak lensing are developing rapidly into tools that can routinely be
applied to samples rivaling, for example, those considered by X-ray-only
scaling relation studies. I will introduce a new survey, the Local
Cluster Substructure Survey (LoCuSS) that is assembling a sample of ~100
clusters with HST, Subaru, Chandra, XMM, SZE and Spitzer data. The
overall goal is to study how the recent assembly history of the clusters
(as revealed by lensing-based mass maps) influences the baryons trapped in
the clusters. After outlining the results that motivated the survey (e.g.
structural segregation in the mass-temperature plane), I will present new
LoCuSS results on the mass-observable scaling relations and the
relationship between cluster merger history and the propoerties
and thus evolution of brightest cluster galaxies.
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Last modified on 12th Nov 2007 by Johan Richard.  

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