Colloquia Schedule Fall 2012

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

Sep. 4

"Finding and Characterizing the Sources of the Ionizing Background with Keck and HST"


Brian Siana

University of California, Riverside

host: Steve Finkelstein

Sep. 11

1. "Investigating the Early Universe with Lyman-alpha Emission: Galactic Winds and Stellar Populations at z ~ 3.1"
2. "Two Can't Play That Game: The Perils of Planet Formation in Binary Environments"
3. "Magnetic Fields in the Milky Way"


1. Emily McLinden, 2. Stefano Meschiari, and 3. Michael Pavel

University of Texas at Austin

host: Sarah Tuttle

Sep. 18

"Star Formation, Near and Far (y un anyo en Ame'rica del Sur)"


Neal Evans

University of Texas at Austin

host: Steve Finkelstein

Sep. 25

"Measuring Galaxy Evolution from Modern Near-IR Surveys"

One of the great triumphs of cosmology is that we now have a theoretical understanding of the growth of dark matter structures in our Universe with sufficient accuracy that the uncertainties no longer impact significantly on the physics of galaxy formation. This is not the case for the complex physics that govern the baryons, and so much of our knowledge of galaxy evolution has and continues to advance because of observational discoveries. In this talk, I will describe results from two modern surveys, both using deep, large-area imaging at near-infrared (1-2 micron) wavelengths, including the Hubble Space Telescope (CANDELS) and the medium-band imaging survey from the Magellan Telescope (zFourGE). A critical epoch for galaxies is 1.5 < z < 3.5, where star-formation activity peaks and many of the family scaling relations are established. The size and depth (K=25 AB mag) of these modern surveys now allows us to measure with high accuracies the distances (from greatly improved photometric redshifts), structure properties, stellar masses, and star-formation rates for galaxies at this critical epoch. I will use the data from these modern surveys to constrain the formation of disk galaxies like the Milky Way both at z > 1 and from z=1 to the present day. I will discuss correlations between star-formation activity and morphology in distant galaxies, including constraints on environmental influences at z~1.5-2. I will also describe searches with these data for rare objects, including z~7 candidates and very late-type Galactic brown dwarfs. Lastly, I will discuss ongoing and future research to understand the "formation epoch" of galaxies, where the ultimate goal is to form a coherent physical theory for galaxy formation.


Casey Papovich

Texas A&M University

host: Steve Finkelstein

Oct. 2

"Carbon Stars and Dust Production in the Local Group"


Gregory C. Sloan

Cornell University

host: Harriet Dinerstein

Oct. 9

"Peering Through the EoR Window with the Murchison Widefield Array"


Miguel F. Morales

University of Washington

host: Neal Evans

Oct. 16

"HETDEX Status"


Karl Gebhardt & Gary Hill

University of Texas at Austin

host: Steve Finkelstein

Oct. 23

"Stellar Feedback and the Ecology of the Galactic ISM"


John Bally

University of Colorado, Boulder

host: Keely Finkelstein

Oct. 30

"Obesity in the Universe: Why Did Early-Type Galaxies Grow in Size?"


Richard Ellis

California Institute of Technology

host: Paul Shapiro

Nov. 6

"The Gaseos Environment of Distant Galaxies"


Michele Fumagalli

University of California, Santa Cruz

host: Chris Sneden

Nov. 13

"Cassini-Huygens explores the Saturn System: Recent Discoveries and Science Highlights"


Linda Spilker

Jet Propulsion Laboratory

host: Bill Cochran

Nov. 20

"Exploring Galactic Chemical and Dynamical Evolution: Pre and Post SDSS-III/APOGEE"


Peter Frinchaboy

Texas Christian University

host: Chris Sneden

Nov. 27

"Understanding Galaxy Clusters, the Most Massive Objects in the Universe"


Lindsay King

University of Texas, Dallas

host: Karl Gebhardt

Dec. 4

"Galaxy Formation: Physics and Numerics"


Dusan Keres

University of California, San Diego

host: Karl Gebhardt

Dec. 10

"Ultrahigh Energy Cosmic Rays, Pulsars, and Supernovae"


Kumiko Kotera

Institut d'Astrophysique de Paris

host: Milos Milosavljevic

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


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