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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)