title: On the physics of the low metallicity IMF
creator: Dopcke, Gustavo
subject: 520
subject: 520 Astronomy and allied sciences
description: A fundamental question in the context of structure formation concerns the transition from massive primordial stars to Population I/II stars with typical masses of less than 1 M_Sol, and in particular the physical mechanisms inducing this transition.    The purpose of this work is to study the physical mechanisms that shape the stellar IMF at the early stages of the Universe. With this aim, we perform a set of eight hydrodynamic simulations that include sink particles representing contracting protostars. Evidence for fragmentation was found in all cases, and hence we conclude that there is no critical metallicity below which fragmentation is impossible. Nevertheless, there is a clear change in the characteristic mass of the clouds at Z = 10^-4 Z_Sol.    Moreover, we develop a model for the stellar IMF, which accounts for the evolution of simulated clusters. With that, we can recover results from hydrodynamic simulations, and also observations of the Orion Nebulae Cluster. Finally, we find that the resultant stellar mass distribution is highly dependent on the characteristic mass of the cluster, and the mode of mass accretion.
date: 2013
type: Dissertation
type: info:eu-repo/semantics/doctoralThesis
type: NonPeerReviewed
format: application/pdf
identifier: https://archiv.ub.uni-heidelberg.de/volltextserverhttps://archiv.ub.uni-heidelberg.de/volltextserver/14653/1/thesis.pdf
identifier: DOI:10.11588/heidok.00014653
identifier: urn:nbn:de:bsz:16-heidok-146531
identifier:   Dopcke, Gustavo  (2013) On the physics of the low metallicity IMF.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/14653/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: eng