Archives Séminaires 2011-2012

Séminaire

Séminaire IPAG de Pierre Hily-Blant (IPAG), jeudi 24 mars 2011 à 11h00, IPAG seminar room

The Interstellar Medium is the medium between the stars, yet, it is the place of birth of the stars. At the Galactic scale, the ISM is best understood as a turbulent place. On smaller scales, the cold ISM, where stars form, is likely also turbulent. Words of caution arise from the lack of a definitive proof for the turbulent nature of the ISM. Not only is the ISM turbulent : magnetic fields are now estimated strong enough to imprint their configuration on the cold matter distribution. If a (…)

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Séminaire IPAG de Frédéric Gueth (IRAM), jeudi 19 mai 2011 à 11h00, IPAG seminar room

The first ALMA Call for Proposals (Cycle 0) has been issued a few weeks ago (deadline June 30th, 15h UT). During this seminar, the latest news from the ALMA construction as well as the details of the instrument offered during Cycle 0 will be presented. Practical aspects on how to submit proposals will also be described.

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Séminaire IPAG de Robert Maiolino (OAR, Roma) jeudi 26 mai 2011 à 11h00, IPAG seminar room

I will initially review the metallicity properties of local galaxies and present clear evidence that they follow a relatively tight relation between metal content, stellar mass and star formation rate. This tight relation suggests a long standing equilibrium between star formation and galaxy "breathing", i.e. inflow of pristine gas and outflow of enriched gas. However, the most interesting result is that even galaxies at high redshift out to z 2.5 follow the same relation. This result (…)

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Séminaire IPAG de Alain Omont (IAP, Paris), jeudi 9 juin 2011 à 11h00, IPAG seminar room

The very few early known, strongly lensed high-z sub-mm sources (FIRAS10214, Cloverleaf, APM08279), played a very important role in the development of high-z submm/mm astronomy through pioneer detections of 0.85-1.2mm continuum and CO lines, and various high sensitivity studies allowed by their strong magnification. Herschel wide surveys, which will hopefully observe 1000 deg², are discovering hundreds of similarly strongly lensed submm galaxies (e.g. Negrello et al. 2010). I will first (…)

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Séminaire IPAG de François Viallefond (LERMA, Paris), jeudi 7 juillet 2011 à 11h00, IPAG seminar room

In 2008 the ALMA project decided to put in two phases the development of its data model, the versions 1 and 2. The version 1 is currently used by ALMA and the EVLA. The definition of version 2 is elaborated in a broader context to allow to support a multiplicity of concepts of (radio-)telescopes. Covering two use-cases of very different concepts ALMA and EMBRACE (a prototype of a multi-beam aperture phased array in the design study for SKA), the development of the version 2 leads to a (…)

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Séminaire IPAG de Fabien Malbet (IPAG), jeudi 1er septembre 2011 à 11h00, IPAG seminar room

The scientific goal of the NEAT (Nearby Earth Astrometric telescope) mission is to detect and characterize planetary systems in an exhaustive manner down to 1 Earth Mass in the habitable zone and further away, around nearby solar-type stars. This survey would provide the actual planetary masses, the full characterization of the orbits for all the components of the planetary system down to that the Earth mass limit. Astrometry in space using small-angle differential astrometry between sources (…)

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Séminaire IPAG de Sébastien Fromang (CEA), jeudi 22 septembre 2011 à 11h00, IPAG seminar room

In accretion disks, outward angular momentum is believed to result from the action of MHD turbulence powered by the magnetorotational instability. Because of the complex nature of the flow that results, the effects of the turbulence are often modeled by enhanced transport coefficients. This approach has led for example to the famous alpha disk model, which has been used in a large number of applications. In some cases, the validity of such a modeling is questionable. In this talk, I will (…)

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Indépendamment des activités qualité développées depuis quelques années, dans différents laboratoires, telle la cellule qualité mise en place au LAOG, l’INSU et le CNES ont voulu mettre en place des Référents Qualité dans les laboratoires spatiaux, s’appuyant sur une base de travail commune (à partir de 2009). Aujourd’hui 7 personnes occupent cette fonction qui a été étendue à des laboratoires/observatoires instrumentaux non spatiaux.
L’objectif de ce séminaire sera de vous présenter dans (…)

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Séminaire IPAG de Pierre Gratier (IRAM), jeudi 6 octobre 2011 à 11h00, IPAG seminar room

La variété de galaxies dans le Groupe Local rend possible l’étude du milieu interstellaire et de la formation d’étoiles dans des conditions différentes de celles trouvées dans la Voie Lactée, tout en conservant une grande résolution spatiale grâce à leur proximité. Je présenterai des résultats issus de la combinaison d’observations du milieu moléculaire, du milieu atomique et de l’émission des poussières dans l’infrarouge lointain de deux galaxies sous métalliques du Groupe Local, M33 et (…)

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Séminaire IPAG de Yves Marrocchi (CRPG, Nancy), jeudi 13 octobre 2011 à 14h00, IRAM seminar room