Colloquia Schedule Spring 2013
Colloquia are on Tuesdays (unless otherwise indicated) at 3:30 pm in RLM 15.216B
"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" The South Pole Telescope (SPT) has systematically identified a large number of high-redshift strongly gravitationally lensed starburst galaxies in a 2500 square degree cosmological survey of the millimeter (mm) sky. These sources are selected by their extreme mm flux, which is largely independent of redshift and lensing configuration. The flux magnification provided by the gravitational lensing enabled us to perform a spectroscopic redshift survey with the recently commissioned Atacama Large Millimeter Array (ALMA). We targeted 26 SPT sources and obtained redshifts via molecular carbon monoxide (CO) lines. We determine that roughly 40% of these sources lie at z > 4, indicating the fraction of dusty starburst galaxies at high-redshift is far higher than previously thought. Two sources are at z = 5.7, placing them among the highest redshift starbursts known, and demonstrating that large reservoirs of molecular gas and dust can be present in massive galaxies near the end of the epoch of cosmic reionization. These sources were additionally targeted with high resolution imaging with ALMA, unambiguously demonstrating them to be strongly gravitationally lensed by foreground structure. We are undertaking a comprehensive and systematic followup campaign to use these "cosmic magnifying glasses" to study the infrared background in unprecedented detail, inform the condition of the interstellar medium in starburst galaxies at high redshift, and place limits on dark matter substructure. I will discuss the scientific context and potential for these strongly lensed starburst galaxies, give an overview of our team's extensive followup efforts, and describe our latest science results. 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)" 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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