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STScI Webcast

2011 Spring Symposium

Dark Matter Properties and Galaxy Properties

Presented by: Risa Wechsler (Stanford University)
Category: Science Symposium   Duration: 30 minutes   Broadcast date: May 05, 2011
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Dark matter provides the seeds of structure upon which galaxies form. I will review the basics of the formation of dark matter halos, informed by new results based on high-resolution cosmological simulations and gravitationally-consistent merger trees. Recent studies indicate that galaxy properties, including their stellar masses and star formation rates, are strongly correlated with the properties of their dark matter halo hosts. A model based on LCDM halos and this tight connection is in excellent agreement with a wide range of data, including the statistics of Magellanic Cloud mass satellites around Milky Way mass hosts. In the context of a given cosmological model, I will show how the galaxy-halo relation can be tightly constrained at low redshift, and how the galaxy-halo connection can be used to infer the full star formation histories of galaxies. For the faintest dwarfs, there is still considerable degeneracy between the galaxy-halo connection and the properties of dark matter.

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Risa Wechsler's presentation PDF document (.pdf)