Seminar Announcement - OATS-DAUT SEMINAR - Wednesday, February 20th, at 12:00 noon (Villa Bazzoni)

[Gabriella Schiulaz]

I announce you next OAT-DAUT seminar:

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                  OATS-DAUT SEMINAR 
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Speaker: Chiara Mastropietro (USM, Munich) 

Title: Ram-pressure versus tides: when gravity is only part of the story 

Date: Wednesday, February 20th, 2008 
Time: 12:00 
Venue: Villa Bazzoni (via Bazzoni, 2)

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Abstract: 
How does the combined effect of gravitational and hydrodynamical forces affect the evolution of a substructure orbiting in a dense environment? The well known ''Bullet Cluster'' (1E0657-56) probably represents the most extreme case where the behavior of the collision dominated hot gas is clearly distinguishable from the collisionless stellar and dark matter components. On a completely different ram-pressure regime, the gaseous Magellanic Stream, which stretches for over 100 degrees in the Southern Sky, is the most prominent signature of an ongoing interaction between the hot halo of the Milky Way and the Large Magellanic Cloud. Could ram-pressure stripping from a tenuous Galactic halo be also advocated to explain the lack of gas observed in many dwarf spheroidal galaxies in the Local Group? 
I will present the results of high resolution N-body/SPH simulations where the morphological and kinematical evolution of the substructures is modeled in details. 
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contact: Andrea Biviano (OATS) 




Next week seminar: 

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OATS-DAUT SEMINAR 
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Speaker: Andreja Gomboc (University of Ljubljana, Slovenia) 
Title: Early Optical Afterglows of GRBs with 2-m Robotic Telescopes 

Date: Wednesday, February 27th, 2008 
Time: 12:00 
Venue: Villa Bazzoni 
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Abstract: 
In last three years many new insights into Gamma Ray Bursts (GRBs) physics have been brought by the Swift satellite. Rapid and accurate localization of GRBs by the Swift enables rapid response ground-based telescopes to routinely commence with observations of optical afterglows within minutes after the burst. The combination of gamma-ray, X-ray, optical and ultraviolet data from Swift instruments with deep, early-time optical imaging from ground-based telescopes is providing unprecedented multiwavelength datasets. 
I will present the observational strategy and some results of rapid, automatic, optical follow-up observations of a sample of GRBs using the 2-m robotic Liverpool and Faulkes Telescopes. The observations are carried out from minutes to a few hours after the prompt GRB and result in well-sampled light curves. I will review and discuss possible interpretation of the large variety in early afterglow behaviour. 
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contact: Stefano Cristiani (OATS) and/or Dunja Fabian (DAUT) 


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