Colloquia and PhD Talks Schedule Summer 2014

 

May 12
3 PM

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.

close

Jeremy Ritter

University of Texas at Austin

Qualifying Exam Committee Meeting follows at 4 PM in RLM 15.216A

May 13
2 PM

Qualifying Exam/2nd Year Defense

"The Lyman-alpha Signature of the First Galaxies"

abstract

Aaron Smith

University of Texas at Austin

Qualifying Exam Committee Meeting follows at 3 PM in RLM 15.216A

May 14
2 PM

Qualifying Exam/2nd Year Defense

"Formation of Massive Star Clusters - an Application of Monte Carlo Radiation Hydrodynamics"

abstract

Tsz Ho (Benny) Tsang

University of Texas at Austin

Qualifying Exam Committee Meeting follows at 3 PM in RLM 15.202A

May 22
3:30 PM

Special Seminar

"Fragmentation in Primordial Gas: Improving H2 Cooling and Self-Shielding"

abstract

Tilman Hartwig

University of Heidelberg, Germany

(host: Volker Bromm)

June 10
3 PM

Special Visiting Speaker Presentation (visiting: 7-14 June 2014)

"Pre-supernova Convection in Massive Stars"

abstract

Manos Chatzopoulos

University of Chicago

host: Crag Wheeler

July 10
11 AM

PhD Defense Presentation

"Creating and Measuring White Dwarf Photospheres in a Terrestrial Laboratory"

abstract

Ross Falcon

University of Texas at Austin

PhD Committee Meeting follows at 12 Noon in RLM 15.216A

July 10
3 PM

PhD Defense Presentation

"Study of Galactic Clumps with Millimeter/Submillimeter Continuum and Molecular Emission: Early Stages of Massive Star Formation"

abstract

Manuel Merello

University of Texas at Austin

PhD Committee Meeting follows at 4 PM in RLM 15.216A

July 11
11 AM

PhD Defense Presentation

"Simulating the Formation, Properties, and Impact of Stellar Systems in the First Galaxies"

abstract

Chalence Safranek-Shrader

University of Texas at Austin

PhD Committee Meeting follows at 12 Noon in RLM 15.216A

Aug 8
2 PM

Special Presentation

"The Violent Early Lives of Stars and Planets"

abstract

Joel Green

University of Texas at Austin

Aug 11
11 AM

PhD Defense Presentation

"The Chemical Abundances of Stars in the Halo"

Julie Hollek

University of Texas at Austin

PhD Committee Meeting follows at 12 Noon in RLM 15.202A

Aug 14
2 PM

PhD Defense Presentation

"Radiation Hydrodynamics and Simulations of Astrophysical Phenomena"

Chris Lindner

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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