23/02/2005– Auditório Principal Bloco G – IAG/USP
Dra. Vera E. Margoniner
Depto. de Física/Universidade da Califórnia, Davis – EUA
Título/Title: Shear-Selected Clusters from the Deep Lens Survey
Resumo/Abstract:
| We present preliminary
results from the Deep Lens Survey (DLS) shear-selected cluster search. The
DLS is a deep BVRz' weak lensing survey of 20 square degrees, which will
produce a sample of ~ 100 shear-selected clusters. We base the lensing analysis
on the R band images, which have strictly controlled image quality, and
we use the other filters to derive photometric redshifts for ~ 3 million
sources. We present mass maps of several 2 degree by 2 degree fields, yielding
a preliminary sample of 18 clusters spanning the redshift range 0.2–0.7.
For a few of these clusters, we present more detailed mass maps and tomographic
lensing analyses. Our followup focuses on the X-ray and optical properties of these clusters, which may reveal biases in existing X-ray and optically selected samples. Chandra and/or XMM X-ray observations are soon to be complete for the first fifteen clusters from the sample, and we present mass and X-ray maps of some individual clusters. |
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