SEMINAR ANNOUNCEMENT - OAT and DAUT SEMINAR - Wedn. December 6, at 12:00 noon (Villa Bazzoni)

[Gabriella Schiulaz]

I announce you next OAT-DAUT Seminar:

*********************************************************** 
                      OAT-DAUT SEMINAR 
*********************************************************** 

Speaker: Fabio La Franca (Univ. di Roma Tre) 

Title: The evolution of active galactic nuclei 

Date: Wednesday, December 6th, 2006 
Time: 12:00 noon 
Venue: Villa Bazzoni 

*********************************************************** 
Abstract: 
We will present the latest results on the cosmological evolution of the density of active galactic nuclei (AGNs) and of their NH distribution up to redshift 4. We used the HELLAS2XMM 2-10 keV X-ray sample combined with other published catalogs. Our best fit is obtained with a luminosity-dependent density evolution model where low-luminosity AGNs peak at z~0.7, while high-luminosity AGNs peak at z~2.0. There is evidence that the fraction of absorbed (NH>1022 cm-2) AGNs decreases with the intrinsic X-ray luminosity and increases with the redshift. Our results will be compared with the latest analyses on the density of AGN derived from mid-infrared surveys carried out with SPITZER. Using these data, we will present the estimate of the history of the density of supermassive black holes in the Universe. 
*********************************************************** 


Future Seminars 

*********************************************************** 
OATS-DAUT SEMINAR 
*********************************************************** 
Speaker: Tomaso Treu (Univ. of California, Santa Barbara) 
Title: To Be Announced

Date: Monday, December 11th, 2006 
Time: 12:00 noon 
Venue: Villa Bazzoni 


*********************************************************** 
OATS-DAUT SEMINAR 
*********************************************************** 
Speaker: Roberto Maiolino (INAF/Oss. Astr. Roma) 

Title: Metals and dust in the early universe 

Date: Wednesday, December 13th, 2006 
Time: 12:00 noon 
Venue: Villa Bazzoni 

Abstract: 
The metallicity of galaxies is a powerful tracer of their integrated star formation history. Thanks to recent, extensive spectroscopic surveys of high redshift galaxies and active galactic nuclei (AGNs), it is now possible to investigate the metallicity evolution of these objects through the cosmic ages. I will review some of the recent work in this field, and I will discuss the implications within the context of galaxy evolution. Star forming galaxies show a significant metallicity evolution in the redshift range 0 


*********************************************************** 
JOINT DAUT-ICTP-OATS-SISSA COLLOQUIUM 
*********************************************************** 
Speaker: Viatcheslav Muchanov (University of Munich) 

Title: Inflation 

Date: Thursday, January 18th, 2007 
Time: 16:00 
Venue: ICTP Main Building, Conference Room, Ground Floor 


*********************************************************** 
SEMINARIO ECCEZIONALE 
*********************************************************** 
Speaker: Pietro Greco (SISSA) 

Title: Prove tecniche di trasmissione. La comunicazione 
nell'era post-accademica della scienza 

Date: Wednesday, January 24th, 2007 
Time: 12:00 noon 
Venue: Villa Bazzoni 
*********************************************************** 

For additional information on scheduled 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