[Alumnos] Charlas del Dr. Laerte Sodre de la Universidad de San Pablo

[Favio Raul Faifer]

Lunes 18/10/2010, 14 hs. Salon Meridiano

Titulo: The Brazilian Experience in Gemini Observatory

I shall discuss how is, currently, the access of Brazilian community to large 
telescopes and, in particular, to the Gemini Observatory. I will also present a 
brief evaluation of how Brazilians have been using Gemini and some propspects 
for our (still uncertain) future in this observatory.

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Martes 19/10/2010, 14 hs. Salon Meridiano

Titulo: Morphological Properties of Superclusters of Galaxies

We studied superclusters of galaxies in a volume-limited sample extracted from 
the Sloan Digital Sky Survey Data Release 7 (SDSS/DR7) and from mock catalogues 
based on a semi-analytical model of galaxy evolution in the Millenium 
Simulation. A density field method was applied to a sample of galaxies brighter 
than M_r= -21+5log h to identify superclusters, taking into account selection 
and boundary effects. In order to evaluate the influence of threshold density, 
we have chosen two thresholds: the first maximizes the number of objects (D1), 
and the second constrains the maximum supercluster size to ~120 h^{-1} Mpc 
(D2). We have performed a morphological analysis, using Minkowski Functionals, 
based on a parameter which increases monotonically from filaments to pancakes. 
An anti-correlation was found between supercluster richness (and total 
luminosity or size) and the morphological parameter, indicating that 
filamentary structures tend to be richer, larger and more luminous than 
pancakes in both observed and mock catalogues. We have also used the mock 
samples to compare supercluster morphologies identified in position and 
velocity spaces, concluding that our morphological classification is not biased 
by the peculiar velocities. Monte Carlo simulations designed to investigate the 
reliability of our results with respect to random fluctuations show that these 
results are robust. Our analysis indicates that filaments and pancakes present 
different luminosity and size distributions.
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