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OATS-DAUT SEMINAR
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Speaker:
Vincenzo Antonuccio (INAF/Osservatorio Astronomico di Catania)
Title:
A Weak Lensing analysis of Abell 209
Date: Wednesday, May 31st, 2006
Time: 12:00 noon
Venue: Villa Bazzoni
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Abstract:
The cluster Abell 209 has been extensively studied in the recent
past. It appears to have a single peak in redshift distribution, and also the
optical galaxy distribution does not show any strong sign of substructure
(Mercurio, Girardi et al., 1997, 2001). We have applied a
Kaiser-Squires-Broadhurst Weak Lensing pipeline recently developed by one of
us (S. P.-H.) to extract the shear signal out of a deep stacked R-band
archival image of this cluster. More than 14,000 background galaxies have
been used to measure the WL signal, using both Mass Aperture (Schneider,
1996) and Mass Reconstruction (Seitz and Schneider, 2001) methods.
The WL reconstructions show also a single peak, almost coincident in
distribution with the galaxy and X-ray maps. From a NFW fit we estimate a
mass 9.26*1014 M_sol within 500 Kpc, larger than the one found in previous
work (Smith et al., 2005), but consistent with X-ray estimates.
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