General information
Organisation
The French Alternative Energies and Atomic Energy Commission (CEA) is a key player in research, development and innovation in four main areas :
• defence and security,
• nuclear energy (fission and fusion),
• technological research for industry,
• fundamental research in the physical sciences and life sciences.
Drawing on its widely acknowledged expertise, and thanks to its 16000 technicians, engineers, researchers and staff, the CEA actively participates in collaborative projects with a large number of academic and industrial partners.
The CEA is established in ten centers spread throughout France
Reference
SL-DRF-24-0444
Direction
DRF
Thesis topic details
Category
Miscellaneous
Thesis topics
Early disk formation and the onset of universal star-formation, a probe of the influence of dark baryons
Contract
Thèse
Job description
The James Webb Space Telescope has revealed the presence of spiral galaxies very early in the history of the universe (up to redshifts greater than z=5). The appearance of disks so early on is surprising, as they are fragile structures, and seems to reinforce the idea that angular momentum is contributed by the accretion of intergalactic matter. This phenomenon of accretion through cooled filaments could explain several unexpected results from the James Webb. It could also be at the origin of the universal star formation, known as secular star formation, observed in galaxies in the form of a correlation between star formation rate and stellar mass (main sequence of star formation, MS). They would provide the reservoirs for star formation and help regulate it. This represents a major paradigm shift in our understanding of the origin of galaxy shapes and their star formation history. During this thesis, we will address this question through the access to data from the James Webb, Euclid and numerical models to test this hypothesis. It should be noted that without this type of explanation for the high efficiency of galaxy formation observed by the James Webb, we would have to invoke much more drastic changes that could open up a new field. This thesis will help to determine this.
University / doctoral school
Astronomie et Astrophysique d’Île de France (ED A&A)
Thesis topic location
Site
Saclay
Requester
Position start date
01/10/2024
Person to be contacted by the applicant
ELBAZ David david.elbaz@cea.fr
CEA
DRF/IRFU/DAP/LCEG
bâtiment 709 pièce 269
CEA Saclay
91191 Gif-sur-Yvette Cedex
0169085439
Tutor / Responsible thesis director
ELBAZ David david.elbaz@cea.fr
CEA
DRF/IRFU/DAP/LCEG
bâtiment 709 pièce 269
CEA Saclay
91191 Gif-sur-Yvette Cedex
0169085439
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