Colloquia Schedule Fall 2011

Colloquia are on Tuesdays (unless otherwise indicated) at 3:30 pm in RLM 15.216B

Aug. 30

Not your Parents' M Dwarfs: Probing the Milky Way with its Smallest Constituents (Cancelled due to Hurricane Irene: to be rescheduled)

abstract

Andrew A. West

Boston University

host: Colette Salyk

Sept. 6

Maxwell, Einstein, and Their Impossibilities

abstract

Mark G. Raizen

Center for Nonlinear Dynamics & Dept. of Physics, University of Texas at Austin

hosts: Paul Shapiro & Tanja Rindler-Daller

Sept. 13

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.

close

James S. Bullock

University of California, Irvine

host: TBD

Sept. 20

Black Hole Scaling Relations

abstract

Kayhan Gultekin

University of Michigan

host: Karl Gebhardt

Sept. 27

The Quest for the Dynamical Signature of Close Supermassive Binary Black Holes

abstract

Michael Eracleous

Pennsylvania State University

host: Julie Comerford

Oct. 4

What is a Galaxy?

abstract

Beth Willman

Haverford College

host: TBD

Oct. 11

No talk scheduled, to avoid conflict with Frank N. Bash Symposium
(held: October 9-11, 2011).

Oct. 18

Status update on the James Webb Space Telescope project

abstract

Jane Rigby

NASA Goddard Space Flight Center

host: TBD

Oct. 25

GAMA: from Little Blue Fuzzies to Massive Red Monsters and Beyond

abstract

Sarah Brough

Swinburne University

host: Karl Gebhardt

Nov. 1

Casting Shadows on the Standard Interstellar Medium Paradigm with GALFA-HI

abstract

Joshua E. G. Peek

Columbia University

host: Sarah Tuttle

Nov. 8

Beatrice M. Tinsley Visiting Scholar

The Origins of Planetary Systems - Constraints from Protoplanetary Disks

abstract

Ilaria Pascucci

University of Arizona

host: John Lacy

Nov. 15

No talk scheduled.

Nov. 22

No talk scheduled.

Nov. 29

Stellar Forensics with Explosions: Supernovae, Gamma-Ray Bursts, and their Environments

abstract

Maryam Modjaz

New York University, Center for Cosmology and Particle Physics

host: Sarah Tuttle

Dec. 13

HETDEX Special Colloquium

Astrophotonics and Space Photonics: A New Era of Instrumentation

abstract

Lisa Fogarty

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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