Colloquia Schedule Spring 2013

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

Jan 18
2 PM

"Probing the Physics of the Dark Universe with Galaxies"


Risa H. Wechsler

Stanford University

hosts: Shardha Jogee (Astronomy) & Linda Reichl (Physics)

Jan 22

"From Building Blocks to Large Galaxies: Towards Understanding the Formation of the Milky Way"


Anna Frebel

Massachusetts Institute of Technology

host: Volker Bromm

Jan 29

"High-redshift, Gravitationally Lensed Starburst Galaxies Revealed by the South Pole Telescope and ALMA"


Joaquin D. Vieira

California Institute of Technology (Caltech)

host: Neal Evans

Feb 5

"The Death of Massive Stars"


Christian D. Ott

California Institute of Technology (Caltech)

host: Milos Milosavljevic

Feb 12

Tinsley Scholar

"Asteroseismology with the Kepler Mission"


Gerald Handler

Nicolaus Copernicus Astronomical Center, Warsaw

hosts: Fritz Benedict, and Stars Research Group

Feb 19

"Three-Dimensional Simulations of Core-Collapse Supernovae"


Sean Couch

University of Chicago

host: Milos Milosavljevic & Craig Wheeler

Feb 26

"The Dark Ages Radio Explorer (DARE)"

In the New Worlds, New Horizons in Astronomy & Astrophysics Decadal Survey, Cosmic Dawn was singled out as one of the top astrophysics priorities for this decade. Specifically, the Decadal report asked "when and how did the first galaxies form out of cold clumps of hydrogen gas and start to shine - when was our cosmic dawn?" It proposed "astronomers must now search the sky for these infant galaxies and find out how they behaved and interacted with their surroundings." This is the science objective of DARE - to search for the first stars, galaxies, and black holes via their impact on the intergalactic medium (IGM) as measured by the highly redshifted 21-cm hyperfine transition of neutral hydrogen (HI). DARE will probe redshifts of 11-35 (Dark Ages to Cosmic Dawn) with observed HI frequencies of 40-120 MHz. DARE will observe expected spectral features in the global signal of HI that correspond to stellar ignition (Lyman-alpha from the first stars coupling with the HI hyperfine transition), X-ray heating/ionization of the IGM from the first accreting black holes, and the beginning of reionization (signal dominated by IGM ionization fraction). We propose to observe these spectral features with a broad-beam bi-conical dipole antenna along with a receiver and digital spectrometer that has high heritage from the ground-based EDGES experiment. We will place DARE in lunar orbit and take data only above the farside, a location known to be free of human-generated RFI and with a negligible ionosphere. In this talk, I will present the mission concept including initial results from an engineering prototype in Green Bank, WV and western Australia which is designed to perform end-to-end validation of the instrument and our calibration techniques. I will also describe our signal extraction tool, using a Markov Chain Monte Carlo technique, which measures the parameterized spectral features in the presence of substantial Galactic and solar system foregrounds.


Jack O. Burns

University of Colorado, Boulder

host: Craig Wheeler

Mar 5

"Feedback in Faint Galaxies During the Peak Epoch of Star Formation"


Dawn Erb

University of Wisconsin, Milwaukee

host: Steve Finkelstein

Mar 12

Spring Break: no talks or classes scheduled this week (March 11-15).

Mar 19

Tinsley Scholar

"Reionization History and Physical Processes Indicated from the Census of Galaxies at z~>7"


Masami Ouchi

University of Tokyo, ICRR

hosts: Roderik Overzier & UT Astronomy Galaxies Research Group

Mar 26

"Dark Matter in Dwarf Spheroidal Galaxies"


Anatoly Klypin

New Mexico State University

host: John Kormendy

Apr 1
3:00 pm

PhD Defense Presentation

"Theoretical Studies of Superluminous Supernovae"


Emmanouil "Manos" Chatzopoulos

University of Texas at Austin

Apr 2

"Galaxy Star Formation Efficiency from z = 0 to z = 8"


Peter Behroozi

Stanford University

host: Shardha Jogee

Apr 9

"Bayesian Success Stories in Astronomy"


James Scott

University of Texas at Austin, Dept. of Information, Risk, and Operations Management, Red McCombs School of Business

host: Daniel Jaffe

Apr 16

"New Clues on the Origin of the Astrophysical r-Process"


Richard Boyd

Lawrence Livermore National Laboratory/National Ignition Facility

host: Chris Sneden

Apr 19

PhD Defense Presentation

"Metallicities of Anomalous-Velocity Gas in the Vicinity of the Milky Way"


John Barentine

University of Texas at Austin

Apr 23

"The WISP Survey: Overview of Recent Results for Galaxies in the 1 < z < 2 Redshift Range"


Claudia Scarlata

University of Minnesota

host: Steve Finkelstein

Apr 30

Tinsley Scholar

"YSOVAR: Mid-Infrared Variations in Young Stars"


Luisa M. Rebull

California Institute of Technology

host: Joel Green & UT Astronomy Interstellar Research Group

May 7

"Repeating Novae and the Origin of SN Ia Events"


George Wallerstein

University of Washington

host: Harriet Dinerstein

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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