Mathematics – Logic
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21344303d&link_type=abstract
American Astronomical Society, AAS Meeting #213, #443.03; Bulletin of the American Astronomical Society, Vol. 41, p.324
Mathematics
Logic
Scientific paper
One of the most important unresolved issues for galaxy formation theory is to understand the origin of exponential galactic disks. We use a disk galaxy evolution model to investigate whether galaxies with exponential surface brightness profiles can be produced in a cosmologically motivated framework for disk galaxy formation. Our model follows the detailed accretion, cooling, and ejection of baryonic mass inside growing dark matter haloes, with cosmologically motivated specific angular momentum distributions. Exponential and quasi-exponential disks can be produced by our model through a combination of SN driven galactic outflows (which preferentially remove low angular momentum material) and intrinsic variation in the angular momentum distribution of the halo gas. We use observations from the SDSS NYU-VAGC to show that the median Sersic index of late-type galaxies is a strong function of stellar mass. Our model with energy driven outflows correctly reproduces this trend, whereas our models with momentum driven outflows and no outflows overpredict the Sersic indices in low mass galaxies. Our results suggest that galactic outflows play a fundamental role in shaping the density profiles of galactic disks.
Dutton Aaron A.
van den Bosch Franciscus Cornelus
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