<> "The repository administrator has not yet configured an RDF license."^^ . <> . . "Constraining the nature of dark matter in galaxies with multi-tracer dynamical models"^^ . "The detailed mass distribution in galaxies provides important constraints on the\r\nnature of dark matter (DM), especially in relation to the baryonic content and\r\nfeedback efficiency of a galaxy. In this thesis I use multiple kinematic tracers and a\r\ndiverse set of dynamical models to simultaneously constrain DM density profiles, halo\r\nshapes and the evolutionary history of galaxies. I first show that the most common\r\nand advanced stellar dynamical models can reproduce the circular velocities (as\r\ntraced independently by molecular gas rotation curves), to within ⇠10% accuracy.\r\nI further use high resolution observations to understand the sources (gravitational,\r\nfeedback driven) of high velocity dispersion ionised gas. By incorporating realistic\r\nbirth conditions for globular clusters (GCs) and flexible, self-consistent velocity\r\ndistribution functions for the Fornax dSph, I am able to understand the survival\r\nof its five GCs. The comprehensive evolutionary model suggests that Fornax has\r\na large DM core (&1.5 kpc) and has undergone a past merger of mass ratio ⇠1:2\r\nto 1:5. Finally, by combining stellar and gas kinematic tracers together in a single\r\ndynamical model, I provide evidence that the isolated dwarf irregular galaxy WLM\r\nhas a DM halo that has both an inner density core (! ⇠ 0.3±0.1), and a prolate axis\r\nratio of 2:1. The recovered orbit structure (tangential anisotropic) is very similar\r\nto nearby dSph galaxies - suggesting that internal processes rather than tidal origin\r\nmay lead to this dynamical configuration. The DM halo profile is consistent with\r\nthe ⇤CDM cosmological picture when baryonic feedback is included. The prolate\r\ngeometry is difficult for MOND and at the same time challenges self-interacting\r\nDM (SIDM) theories to create a thermalised DM core of the observed size, without\r\nsphericalising the halo. From both the dynamical models on WLM and Fornax, I\r\nam able to provide constraints on the particle mass of Bose-Einstein condensate\r\nDM models to 1.1 − 1.3 ⇥ 10−22 eV/c2, and interaction cross section for (velocity\r\nindependent) SIDM particles of 0.8 . \"/mSIDM . 3.1 cm2/g - though it remains to\r\nbe seen that these can produce the proper core size and shape in the DM halos we\r\nfind. Application of these new techniques and models to more galaxies will provide\r\neven tighter constraints on dark matter particle models."^^ . "2019" . . . . . . . "Ying Chi"^^ . "Leung"^^ . "Ying Chi Leung"^^ . . . . . . "Constraining the nature of dark matter in galaxies with multi-tracer dynamical models (PDF)"^^ . . . "Thesis_gigileung.pdf"^^ . . . "Constraining the nature of dark matter in galaxies with multi-tracer dynamical models (Other)"^^ . . . . . . "indexcodes.txt"^^ . . "HTML Summary of #27265 \n\nConstraining the nature of dark matter in galaxies with multi-tracer dynamical models\n\n" . "text/html" . . . "520 Astronomie"@de . "520 Astronomy and allied sciences"@en . .