Colloquia and PhD Talks Schedule Summer 2014
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Qualifying Exam/2nd Year Defense "Outflows and Chemical Enrichment from Clustered Supernovae in the First Galaxies" The prospect that the first stars formed in small clusters, a consequence of
protostellar disk fragmentation, requires that we take a closer look at the
hydrodynamics of clustered supernovae exploding in the host halos of Pop III
stars. How do nested, interacting supernova remnants produce an outflow that
transports metals into the primordial intergalactic medium? How homogeneous
is the chemical enrichment of the gas that ultimately returns to form
second-generation, metal-enriched stars? We present new results from
high-resolution adaptive mesh refinement cosmological hydrodynamic
simulations of a cluster of Pop III core-collapse supernovae. Inserting
core-collapse-type remnants in the early, free expansion phase and
integrating the cooling and hydrodynamics of the superbubble at sub-parsec
resolution for millions of years, we follow the dispersal of metal-enriched
ejecta until a fraction has burst into the intergalactic medium, and another
fraction has recollapsed into dense, metal-enriched clouds, poised to form
the first low-mass stars. We present estimates for metallicity distributions
in dwarf galaxy progenitors that could evolve to become ultra-faint dwarf
spheroidal satellite galaxies (UFDs) lacking supernova Type Ia signatures
such as Segue 1. We discuss the prospect for discerning the discrete
contributions of multiple supernovae in the spectroscopy of stars in UFDs. University of Texas at Austin Qualifying Exam Committee Meeting follows at 4 PM in RLM 15.216A |
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Qualifying Exam/2nd Year Defense "The Lyman-alpha Signature of the First Galaxies" University of Texas at Austin Qualifying Exam Committee Meeting follows at 3 PM in RLM 15.216A |
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Qualifying Exam/2nd Year Defense "Formation of Massive Star Clusters - an Application of Monte Carlo Radiation Hydrodynamics" University of Texas at Austin Qualifying Exam Committee Meeting follows at 3 PM in RLM 15.202A |
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Special Seminar "Fragmentation in Primordial Gas: Improving H2 Cooling and Self-Shielding" University of Heidelberg, Germany (host: Volker Bromm) |
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Special Visiting Speaker Presentation (visiting: 7-14 June 2014) "Pre-supernova Convection in Massive Stars" University of Chicago host: Crag Wheeler |
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PhD Defense Presentation "Creating and Measuring White Dwarf Photospheres in a Terrestrial Laboratory" University of Texas at Austin PhD Committee Meeting follows at 12 Noon in RLM 15.216A |
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PhD Defense Presentation "Study of Galactic Clumps with Millimeter/Submillimeter Continuum and Molecular Emission: Early Stages of Massive Star Formation" University of Texas at Austin PhD Committee Meeting follows at 4 PM in RLM 15.216A |
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PhD Defense Presentation "Simulating the Formation, Properties, and Impact of Stellar Systems in the First Galaxies" University of Texas at Austin PhD Committee Meeting follows at 12 Noon in RLM 15.216A |
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Special Presentation "The Violent Early Lives of Stars and Planets" University of Texas at Austin |
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PhD Defense Presentation "The Chemical Abundances of Stars in the Halo" University of Texas at Austin PhD Committee Meeting follows at 12 Noon in RLM 15.202A |
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PhD Defense Presentation "Radiation Hydrodynamics and Simulations of Astrophysical Phenomena" University of Texas at Austin PhD Committee Meeting follows at 4 PM in RLM 15.202A |
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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