1,748 research outputs found
Weak lensing study of Abell 2029
Abell 2029 is one of the most studied clusters due to its proximity (z=0.07),
its strong X-ray brightness and its giant cD galaxy which is one of the biggest
stellar aggregates we know. We present here the first weak lensing mass
reconstruction of this cluster made from a deep I-band image of 28.5'x28.5'
centered on the cluster cD galaxy. This preliminary result allows us already to
show the shape similarities between the cD galaxy and the cluster itself,
suggesting that they form actually a single structure. We find a lower estimate
of the total mass of 1.8 10^14 h^-1 solar masses within a radius of 0.3 h^-1
Mpc. We finally compute the mass-to-cD-light ratio and its evolution as a
function of scale.Comment: 5 pages, to appear in the proceedings of "Matter and Energy in
Clusters of Galaxies", ASP Conference Serie
The distance duality relation from X-ray and SZ observations of clusters
X-ray and Sunyaev-Zel'dovich data of clusters of galaxies enable to construct
a test of the distance duality relation between the angular and luminosity
distances. We argue that such a test on large cluster samples may be of
importance while trying to distinguish between various models of dark energy.
The analysis of a data set of 18 clusters shows no significant violation of
this relation. The origin and amplitude of systematic effects and the
possibility to increase the precision of this method are discussed.Comment: RevTex, 7 pages, 6 figure
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