Colloquia Schedule Fall 2011
Colloquia are on Tuesdays (unless otherwise indicated) at 3:30 pm in RLM 15.216B
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Not your Parents' M Dwarfs: Probing the Milky Way with its Smallest Constituents (Cancelled due to Hurricane Irene: to be rescheduled) Boston University host: Colette Salyk |
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Maxwell, Einstein, and Their Impossibilities Center for Nonlinear Dynamics & Dept. of Physics, University of Texas at Austin hosts: Paul Shapiro & Tanja Rindler-Daller |
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Dark Matter, Dwarf Galaxies, and Massive Failures in the Halo of the Milky Way The favored dark energy plus cold dark matter (LCDM) model of cosmology predicts that the Milky Way should be surrounded by thousands of dark matter satellite clumps, in great excess of the observed count of Galactic dwarf satellite galaxies. This mismatch is known as the "missing satellite problem". Recent discoveries in the Sloan Digital Sky Survey have revealed a new population of ultra-faint dwarf satellites, motivating excitement within the community that some "missing" LCDM satellites are finally being found. Unfortunately for the theory, the situation is not quite so rosy once the dynamical masses of the known satellites are considered. Specifically, the majority of the most massive dark matter satellites predicted to exist are too dense to host any of the bright satellite galaxies of the Milky Way. This poses a serious puzzle theoretically: either galaxy formation becomes effectively stochastic on scales smaller than ~ 0.1 L* or the central densities of dark matter subhalos are significantly lower than predicted in dissipationless simulations. I discuss some possible solutions to this puzzle from the standpoint of baryonic physics and non-standard dark matter physics. University of California, Irvine host: TBD |
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Black Hole Scaling Relations University of Michigan host: Karl Gebhardt |
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The Quest for the Dynamical Signature of Close Supermassive Binary Black Holes Pennsylvania State University host: Julie Comerford |
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What is a Galaxy? Haverford College host: TBD |
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No talk scheduled, to avoid conflict with Frank N. Bash Symposium |
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Status update on the James Webb Space Telescope project NASA Goddard Space Flight Center host: TBD |
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GAMA: from Little Blue Fuzzies to Massive Red Monsters and Beyond Swinburne University host: Karl Gebhardt |
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Casting Shadows on the Standard Interstellar Medium Paradigm with GALFA-HI Columbia University host: Sarah Tuttle |
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Beatrice M. Tinsley Visiting Scholar The Origins of Planetary Systems - Constraints from Protoplanetary Disks University of Arizona host: John Lacy |
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No talk scheduled. |
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No talk scheduled. |
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Stellar Forensics with Explosions: Supernovae, Gamma-Ray Bursts, and their Environments New York University, Center for Cosmology and Particle Physics host: Sarah Tuttle |
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HETDEX Special Colloquium Astrophotonics and Space Photonics: A New Era of Instrumentation University of Sydney, School of Physics host: Sarah Tuttle |
Visitors to the Department of Astronomy can find detailed information and maps on our Visiting Austin Page.
Please report omissions/corrections to: G. Orris at argus@astro.as.utexas.edu.
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