Nonequilibrium, self-gravity and the fragmented interstellar medium

Diplôme Thèse Nonequilibrium, self-gravity and the fragmented interstellar medium eng 2002-05-31 author Huber Daniel 118874 director Pfenniger Daniel 26497 10.13097/archive-ouverte/unige:156 urn:nbn:ch:unige-1568 Sc. 3348 In 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. Dewey 520 26 Département d'astronomie 12 false 48aa04e3-be2a-424d-bfee-7048e8b7a33d Thesis Public file2.pdf 43761376 application/pdf 6923b510-96bd-4dd5-8031-5309676f0f5a Thesis Public file1 4046830 application/postscript Postscript version openAccess Faculté des sciences / Département d'astronomie

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Huber, Daniel