SEMINAR ANNOUNCEMENT: OATs-DAUT Seminar on Wednesday April 9th, at 12:00 noon, Villa Bazzoni

[Gabriella Schiulaz]

I announce you this week seminar:

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                       OATS-DAUT SEMINAR 
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Speaker: Dan Maoz (School of Physics and Astronomy, Tel-Aviv University) 

Title: Supernova Rates: Near and Far, Cluster and Field 

Date: Wednesday, April 9th, 2008 
Time: 12:00 
Venue: Villa Bazzoni (Via Bazzoni, 2)

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Abstract: 
The measurement of supernova (SN) rates holds great promise, both for tracing the history of cosmic metal enrichment and for understanding the explosions themselves and their progenitors systems. I will describe several ongoing observational programs to measure the rates of type-Ia and core-collapse SNe, as a function of redshift and environment. Based on measurements from the ground and with HST, the SN-Ia rate in galaxy clusters remains low out to redshift z~1, arguing for an early production of the large mass of intracluser metals by a population with a short SN delay time. In the field, I will describe a program with Subaru that aims to measure the SN rate out to z~2, using novel methodologies for SN classification. First results suggest a SN-Ia rate that may be tracking the star-formation history with a small delay, in contrast to the conclusions of the HST-GOODS survey, but in accord with expectations from recent local (z=0) results. Finally, I will discuss a puzzling corollary of all the recent rate measurements: the fraction of the supposed SN-Ia progenitor population that actually explodes as SNe-Ia is suprisingly high -- perhaps higher than possible in any of the currently popular models. 
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contact: Elena Pian (OATS) 




For additional information on OAT seminars see:
http://adlibitum.oats.inaf.it/seminari/

Gabriella Schiulaz
segreteria OAT
Phone: 040-3199241
schiulaz at oats.inaf.it
segreteria at oats.inaf.it