Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...200.9709w&link_type=abstract
American Astronomical Society, 200th AAS Meeting, #97.09; Bulletin of the American Astronomical Society, Vol. 34, p.958
Astronomy and Astrophysics
Astronomy
Scientific paper
Understanding formation and evolution of galaxies is one of the most important goals of modern cosmology. However, the properties of dark matter halos emerging from high-resolution N-body simulations (the "universal" density profiles) do not seem to agree with observed properties of galaxies in certain key aspects. For example, the density profiles of the central parts of real spiral and dwarf galaxies appear flatter compared to their N-body counterparts, and the real disks appear to contain more specific angular momentum than N-body generated galaxies. Our aim is to understand the evolution and present day properties of galaxies, and in particular identify the main aspects of initial conditions and/or subsequent physical processes that were key in determining properties of today's galaxies. We build upon and extend the analytical approach pioneered by Ryden & Gunn (1987), and use it to investigate formation and properties of dark matter halos. Specifically, we consider the origin of angular momentum distribution, and the density profiles interior to the virial radius. We compare results of our approach to those of N-body simulations.
Babul Arif
Dalcanton Julianne J.
Williams Liliya L. R.
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