Conferencias y seminarios
Jueves 11 de Octubre de 2018
Sala de Conferencias Federico Ristenpart (Camino El Observatorio 1515, Departamento de Astronomía, Edificio Central, piso 3, Las Condes, Santiago, Chile)
Seminario de Astronomía "High-mass star and cluster formation in the Milky Way: the Herschel/HOBYS, IRAM/W43-HERO and ALMA-IMF view"
Dr. Frédérique Motte
Institute of Planetology an Astrophysics of Grenoble (IPAG)
High-mass star and cluster formation in the Milky Way: the Herschel/HOBYS, IRAM/W43-HERO and ALMA-IMF view
The physical process by which stars inherit their properties, especially their mass, from those of their parental cloud is the fundamental issue that guides all star formation studies. Our knowledge of this legacy has profound implications for many areas of astrophysics, including the cosmic history of star formation in galaxies. The star-formation recipes commonly used, among which the origin of the initial mass function (IMF) and star formation rates (SFR), are considered to be universal and thus independent of galactic environments. Our recent studies challenge these recipes, which are related to our understanding of star formation.
I will present the Herschel discovery of high-density cloud filaments, which are forming clusters of OB-type stars. Given their high star formation activity, these so-called mini-starburst clouds/ridges could be seen as “miniature and instant models” of starburst galaxies. The characteristics of mini-starburst ridges investigated with the NOEMA and ALMA interferometer challenge star formation models and shed light on the origin of massive clusters. In one of these ridges, the measured star formation rates (SFR) contradicts statistical models of star formation rates. Moreover, its measured core mass distribution suggests that the stellar initial mass function (IMF) may not be determined, in these extreme environments, at the prestellar stage. These results motivated the setting up the ALMA-IMF Large Program, project, which was accepted for Cycle 5 and whose source sample and main objectives will be presented.
Rene A. Mendez
DAS/UChile - firstname.lastname@example.org
Comunicaciones DAS - FCFM