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2016 Fall Science Colloquia

Triumphs and Tribulations of Near-field Cosmology with Wide-field Surveys

Presented by: Beth Willman (Large Synoptic Survey Telescope)
Category: Science Colloquia   Duration: 1 hour   Broadcast date: December 14, 2016
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Over the last 15 years, large sky surveys have revolutionized our view of the stellar halos and dwarf satellite populations orbiting galaxies, such as the Milky Way. Much of this observational progress has been motivated by a series of apparent “crises” for the cold dark matter cosmological model. However, these challenges have effectively functioned as flashlights pointing us to interesting galaxy formation physics. I will present recent observational progress in our understanding of galaxy formation using observations of stellar halos and dwarf satellite populations in the Local Volume, along with the limiting impacts of observational and sample bias. This talk will include first results from the MADCASH (Magellanic Analog Dwarf Companions And Stellar Halos) survey, a Subaru/HSC observational program to map LMC stellar mass galaxies at distances of ~2-4 Mpc, and a look ahead to LSST.