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000004773 0248_ $$aoai:doc.rero.ch:20050601173503-DC$$pthesis$$zcdu34$$zthesis_urn$$zunige$$zreport$$zcdu52$$zbook$$zjournal$$zcdu16$$zpostprint$$zpreprint$$zcdu1$$zdissertation
000004773 035__ $$aR003263556
000004773 041__ $$aeng
000004773 080__ $$a52
000004773 100__ $$aHuber, Daniel
000004773 245__ $$9eng$$aNonequilibrium, self-gravity and the fragmented interstellar medium
000004773 256__ $$apdf
000004773 300__ $$a216 p.
000004773 502__ $$92002-05-17$$aThèse de doctorat : Université de Genève, 2002 ; Sc. 3348
000004773 506__ $$ffree
000004773 520__ $$9fre$$aIn this thesis we study the formation of nonequilibrium structures in open self-gravitating systems, such as the fragmented interstellar medium (ISM). Our interest is particulary focused on the role of gravity. Thus, in a first project numerical simulations of self-gravitating galactic disks are carried out. We find that the competing gravitational and dissipative processes produce persistent patterns formed by transient, filamentary structures. In a second project, we numerically simulate spherical N-body systems and compare them with theoretical models. We find inconsistencies in the interval of negative heat capacity, substantiating the importance of microscopic physics and the lack of consistent theoretical tools for the discription of self-gravitating gas. Finally, we carry out observations of the ISM and analyze its structure. These studies together with the numerical simulations lead to a picture of the ISM that is much more dynamical and less uniform than previously thought.
000004773 700__ $$aPfenniger, Daniel$$eDir.
000004773 8564_ $$f1_these-HuberD.pdf$$qapplication/pdf$$s43641148$$uhttp://doc.rero.ch/record/4773/files/1_these-HuberD.pdf$$yorder:1$$zTexte intégral
000004773 918__ $$aFaculté des sciences$$bUniversité de Genève, Rue Général Dufour 24, 1211 Genève 4$$cDépartement d'astronomie
000004773 919__ $$aUniversité de Genève$$bGenève$$ddoc.support@rero.ch
000004773 980__ $$aTHESIS$$bUNIGE
000004773 990__ $$a20050601173503-DC