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novembre 2016
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Nicolas Peschken (LAM) — Soutenance de thèse

Jeudi 3 novembre 2016 15:00-16:00 - Bibliothèque

Abstract : TBD

LAM Seminar

Vendredi 4 novembre 2016 11:00-12:00

Tom Broadhurst (University of Basque Country) — Three New Lensing Phenomena

Vendredi 4 novembre 2016 11:00-12:00 - Amphi

Abstract : I will describe the first detection of a Super Massive Black Hole revealed by its Einstein Ring, in Hubble Frontier Field data, and also in the same data I will show three individual stars detected at high redshift that are magnified 100,000 times as they cross the lensing caustic of a moving cluster (predicted by Jordi Miralda Escude, 1991). These events we see are modulated by microlensing, consistent with the level predicted by the intra cluster light, and thoroughly exclude cluster dark matter comprised of 30M_sun black holes suggested by Bird etal on the basis of the first LIGO event. An alternative lower mass, higher redshift lensed solution for the first LIGO detection is also presented, incidentally.

Debora Pelliccia (LAM) — Soutenance de thèse

Vendredi 4 novembre 2016 14:00-15:00 - Amphi

Claude Carignan — Exceptional Seminar : HI science with the SKA pathfinders KAT-7 & MeerKAT

Jeudi 10 novembre 2016 11:00-12:00 - Amphi

Abstract : I will first summarize what we learned from HI observations using KAT-7, the precursor array of MeerKAT, the South African pathfinder for the SKA. I will then examine what we expect to be able to achieve, in the near future, with MeerKAT, MeerKAT+ FAST, SKA1 and SKA2.

NO Seminar — National Holiday

Vendredi 11 novembre 2016 11:00-12:00 - Amphi

NO Seminar — National Holiday

Guy Libourel (Observatoire de la Cote d’Azur) — Formation of the first solids of our solar system

Vendredi 18 novembre 2016 11:00-12:00 - Amphi

Abstract : Au cours de cet exposé, je montrerai comment l’étude des inclusions réfractaires et notamment des chondres, constituants principaux des météorites primitives, nous renseigne sur les conditions ayant régné au sein du disque protoplanétaire lors des 10 premiers millions d’années de notre système solaire.

Samuel Quiret (LAM) — Soutenance de thèse

Vendredi 18 novembre 2016 13:30-14:30 - Amphi

Abstract : TBD

Roberto Maiolino (Univ. of Cambridge) — Stellar feedback, AGN-driven outflows and starvation : the multiple routes to quench star formation in galaxies

Vendredi 25 novembre 2016 11:00-12:00 - Amphi

Abstract : Understanding the process responsible for transforming star forming galaxies into passive and quiescent systems is currently one of the hottest topics in astronomy. I will discuss recent observational results probing different mechanisms at work in different galaxies and at different epochs. I will present multi-wavelength observations providing evidence that powerful starburst-driven and AGN-driven outflows have a profound impact on the evolution of galaxies, both locally and at high redshift, by removing huge amount of gas. However such massive outflows may not be able to completely quench star formation in galaxies and actually, in some cases, such outflows can even boost star formation. I will show that the analysis of the stellar metallicities in large samples of local galaxies reveals that “starvation” ( i.e. the lack of gas inflows) is actually responsible for quenching star formation in most galaxies (at least in intermediate/low-mass galaxies). I will discuss the possible mechanisms responsible for galaxy starvation. I will also present some recent results from the ongoing Manga-SDSSIV survey, which is delivering integral field spectroscopy for thousands of galaxies and providing precious spatially resolved information of the quenching processes on different galactic scale.

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