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December 2016
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Giuliana Fiorentino (INAF-Osservatorio Astronomico di Bologna) — Accurate Stellar Photometry in Low and Dense Environments

Friday 2 December 2016 11:00-12:00 - Amphi

Abstract: We will discuss the fundamental role of photometric surveys of resolved stellar populations in our Galaxy and beyond. We have recently analysed the old stellar populations, as traced by RR Lyrae stars, observed in low density environments such as the Galactic halo and dwarf galaxies surrounding the Milky Way. This investigation has revealed that small satellites can not have had a major role in building up this old component of the Galaxy, whereas the contribution of more massive dwarf galaxies like the Large Magellanic Cloud (LMC) and/or the still merging Sagittarius dwarf spheroidal galaxy can be significant. In the near future thanks to Gaia and to the Large Synoptic Survey Telescope these kind of studies will gain much more detail and will be largely extended to the the outskirts of our Local Group (distances 1Mpc).

In the next future, resolved stellar population studies need to be extended even further to explore environments still very poorly known such as the very dense core of Elliptical galaxies in Virgo or Fornax clusters (distances 18Mpc). This is very challenging and only possible exploiting the high resolution power of extremely large telescopes (40-m class). Today we need to learn how to deal with the complex modelling of the Point Spread Function across the FoV that result from the use of adaptive optics (AO) modules to assure the diffraction limit from the ground. Stars are ideal test particles to trace the performances that 1) we can reach with today 8-m class telescopes equipped with AO; 2) we expect from the new generation of giant telescopes. We will describe a systematic study of galactic globular clusters in order to understand our current technical capabilities.

Bruno Ribeiro (LAM) — Soutenance de thèse

Monday 5 December 2016 14:00-15:00 - Amphi

Massimo Viola (Leiden Observatory) — The Kilo Degree Survey: cosmological results

Friday 9 December 2016 11:00-12:00 - Amphi

Abstract: The Kilo Degree Survey (KiDS) is an ongoing ESO survey aiming at studying the growth of structures and the expansion history of the Universe using weak gravitational lensing. I will present in this talk the first constraints on cosmological parameters from a tomographic cosmic shear analysis of 450 square degree. I will discuss the level of agreement of our measurements with other cosmological probes and in particular with the Planck results as well as the implications of the measurements for cosmology.

Javier Álvarez-Márquez (LAM) — Soutenance de thèse

Friday 9 December 2016 14:00-15:00 - Amphi

Mark Dickinson (NOAO, USA) — New views of star formation at high redshift

Friday 16 December 2016 11:00-12:00 - Amphi

Abstract: The history of galaxy evolution has a dirty side: much of the energy that galaxies emit over their lifetimes is absorbed and reradiated by dust. Space infrared satellites and ground-based millimeter telescopes have surveyed infrared emission from galaxies over much of cosmic history, and have demonstrated that at the peak epoch of cosmic star formation (redshift z ≈ 2), most energy from galaxies emerges in the far-infrared. But the limited angular resolution and sensitivity of most previous facilities has left us with an incomplete census: at z > 3, most of our knowledge about ordinary galaxies comes from rest-frame ultraviolet data, and we have little direct information about how much star formation at those high redshifts is obscured. Thanks to its large collecting area and high angular resolution, ALMA is now changing this story with new (sub-)millimeter data. I will discuss some new views of the dusty side of high redshift star formation from Herschel deep fields, Keck near-infrared spectroscopy, and ALMA observations.

NO Seminar — Christmas Holidays

Friday 23 December 2016 11:00-12:00 - Amphi

NO Seminar — Christmas Holidays

NO Seminar — Christmas Holidays

Friday 30 December 2016 11:00-12:00 - Amphi

NO Seminar — Christmas Holidays

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