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OATS-DAUT SEMINAR
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Speaker:
Sebastian Lopez (Universidad de Chile, Santiago)
Title:
Probing cluster galaxies with background QSOs
Date: Thursday, December 13th, 2007
Time: 12:00
Venue: Villa Bazzoni
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Abstract:
I will present results of the first survey of
intervening MgII absorption systems associated with high-z cluster
galaxies. We have investigated the incidence (dN/dz) of MgII absorbers
in 〈z〉= 0.6 cluster galaxies from the Red-Sequence Cluster
Survey. While strong (W_0>1.0 Å) absorbers show a significant
excess (up to 10x), weak (W_0<0.3 Å) absorbers conform to the
field statistics. We argue that this dichotomy could be explained if
cluster galaxies that give rise to weak MgII absorption have their
cold halos truncated as a consequence of environmental effects.
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contact: Paolo Molaro (OATS)