Colloquia Schedule Fall 2012
Colloquia are on Tuesdays (unless otherwise indicated) at 3:30 pm in RLM 15.216B
"Finding and Characterizing the Sources of the Ionizing Background with Keck and HST" University of California, Riverside host: Steve Finkelstein |
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1. "Investigating the Early Universe with Lyman-alpha Emission: Galactic Winds and Stellar Populations at z ~ 3.1" 1. Emily McLinden, 2. Stefano Meschiari, and 3. Michael Pavel University of Texas at Austin host: Sarah Tuttle |
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"Star Formation, Near and Far (y un anyo en Ame'rica del Sur)" University of Texas at Austin host: Steve Finkelstein |
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"Measuring Galaxy Evolution from Modern Near-IR Surveys" Texas A&M University host: Steve Finkelstein |
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"Carbon Stars and Dust Production in the Local Group" Cornell University host: Harriet Dinerstein |
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"Peering Through the EoR Window with the Murchison Widefield Array" University of Washington host: Neal Evans |
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"HETDEX Status" University of Texas at Austin host: Steve Finkelstein |
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"Stellar Feedback and the Ecology of the Galactic ISM" University of Colorado, Boulder host: Keely Finkelstein |
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"Obesity in the Universe: Why Did Early-Type Galaxies Grow in Size?" California Institute of Technology host: Paul Shapiro |
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"The Gaseos Environment of Distant Galaxies" University of California, Santa Cruz host: Chris Sneden |
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"Cassini-Huygens explores the Saturn System: Recent Discoveries and Science Highlights" Jet Propulsion Laboratory host: Bill Cochran |
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"Exploring Galactic Chemical and Dynamical Evolution: Pre and Post SDSS-III/APOGEE" Texas Christian University host: Chris Sneden |
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"Understanding Galaxy Clusters, the Most Massive Objects in the Universe" University of Texas, Dallas host: Karl Gebhardt |
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"Galaxy Formation: Physics and Numerics" University of California, San Diego host: Karl Gebhardt |
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"Ultrahigh Energy Cosmic Rays, Pulsars, and Supernovae" The origin of ultrahigh energy cosmic rays (UHECRs, particles arriving on the Earth with energy 10^17- 10^21 eV) is still a mystery. Candidate sources range from the birth of pulsars to explosions related to long-duration gamma-ray bursts or to events in active galactic nuclei. Young isolated millisecond pulsars have been scarcely discussed as sources of ultrahigh energy cosmic rays (UHECR) in the literature. However, the production of UHECRs in these objects could give a picture that is surprisingly consistent with the latest data measured with the Auger Observatory. I will discuss this original source scenario, and its observable signatures. In particular, these pulsars would be born in supernovae that could present interesting specific radiative features, due to the interaction of the pulsar wind with the surrounding ejecta. The resulting supernova lightcurves could present a high luminosity plateau over a few years, and a bright X-ray and gamma-ray peak around one or two years after the onset of the explosion. If such signatures were observed, they could have important implications both for UHECR astrophysics and for the understanding of core-collapse supernovae. Institut d'Astrophysique de Paris host: Milos Milosavljevic |
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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