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Star formation efficiency in extended UV disks and at high redshifts

Abstract : Perhaps one of the most enigmatic domains of astrophysics is that of galaxy formation and evolution.A galaxy is defined by its stellar and gas contents. Hence, any theory of galaxy formation has to address the question of the formation of stars.Observations show that star formation takes place in dense molecular clouds.Therefore, the efficiency of star formation of a galaxy is determined by its ability to form molecular clouds.The determination of these processes and their efficiency is among the most important issues in our understanding of star formation.The present work studies the star formation laws in a wide range of physical and dynamical conditions, even in low density environmentsand down to molecular cloud scales, as well as high redshift galaxies, to explore the cosmic star formation history.Low density environments, like the outermost disk of galaxies mimic the physical conditions of dwarf galaxies and also that of galaxiesin the early Universe. Across the Hubble time, there was a peak in the star formation rate, at z ~1-2, about ten billions years ago. Then the average star formation rate dropped by a factor 20 down to the present rate. This Ph.D focuses on the star formation efficiency in two contexts: in low environments, like outer galaxy disks and at the epoch the near the peak of star formation.
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  • HAL Id : tel-02122710, version 1


Isadora Chaves Bicalho. Star formation efficiency in extended UV disks and at high redshifts. Astrophysics [astro-ph]. Université Paris sciences et lettres, 2018. English. ⟨NNT : 2018PSLEO018⟩. ⟨tel-02122710⟩



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