Colloquia Schedule Spring 2013
Colloquia are on Tuesdays (unless otherwise indicated) at 3:30 pm in RLM 15.216B
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"Probing the Physics of the Dark Universe with Galaxies" Stanford University hosts: Shardha Jogee (Astronomy) & Linda Reichl (Physics) |
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"From Building Blocks to Large Galaxies: Towards Understanding the Formation of the Milky Way" Massachusetts Institute of Technology host: Volker Bromm |
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"High-redshift, Gravitationally Lensed Starburst Galaxies Revealed by the South Pole Telescope and ALMA" California Institute of Technology (Caltech) host: Neal Evans |
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"The Death of Massive Stars" California Institute of Technology (Caltech) host: Milos Milosavljevic |
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Tinsley Scholar "Asteroseismology with the Kepler Mission" Nicolaus Copernicus Astronomical Center, Warsaw hosts: Fritz Benedict, and Stars Research Group |
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"Three-Dimensional Simulations of Core-Collapse Supernovae" University of Chicago host: Milos Milosavljevic & Craig Wheeler |
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"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. University of Colorado, Boulder host: Craig Wheeler |
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"Feedback in Faint Galaxies During the Peak Epoch of Star Formation" University of Wisconsin, Milwaukee host: Steve Finkelstein |
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Spring Break: no talks or classes scheduled this week (March 11-15). |
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Tinsley Scholar "Reionization History and Physical Processes Indicated from the Census of Galaxies at z~>7" University of Tokyo, ICRR hosts: Roderik Overzier & UT Astronomy Galaxies Research Group |
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"Dark Matter in Dwarf Spheroidal Galaxies" New Mexico State University host: John Kormendy |
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PhD Defense Presentation "Theoretical Studies of Superluminous Supernovae" Emmanouil "Manos" Chatzopoulos University of Texas at Austin |
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"Galaxy Star Formation Efficiency from z = 0 to z = 8" Stanford University host: Shardha Jogee |
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"Bayesian Success Stories in Astronomy" University of Texas at Austin, Dept. of Information, Risk, and Operations Management, Red McCombs School of Business host: Daniel Jaffe |
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"New Clues on the Origin of the Astrophysical r-Process" Lawrence Livermore National Laboratory/National Ignition Facility host: Chris Sneden |
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PhD Defense Presentation "Metallicities of Anomalous-Velocity Gas in the Vicinity of the Milky Way" University of Texas at Austin |
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"The WISP Survey: Overview of Recent Results for Galaxies in the 1 < z < 2 Redshift Range" University of Minnesota host: Steve Finkelstein |
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Tinsley Scholar "YSOVAR: Mid-Infrared Variations in Young Stars" California Institute of Technology host: Joel Green & UT Astronomy Interstellar Research Group |
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"Repeating Novae and the Origin of SN Ia Events" 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 argus@astro.as.utexas.edu.
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