Colloquia Schedule Spring 2015
Colloquia are on Tuesdays (unless otherwise indicated) at 3:30 pm in RLM 15.216B
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Tinsley Visiting Scholar: Planetary Group "Habitability of Planets Orbiting M Dwarfs" University of Washington host: Mike Endl |
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"The Elusive and Ionized Gas Surrounding the Magellanic System" Texas Christian University host: Cyndi Froning |
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"Probing the Nature of Accretion and Planet Formation in Protoplanetary Disks: Connecting Theory with ALMA Observations" Southwest Research Institute (SwRI) host: Neal Evans |
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"The Large Reservoirs of Gas Around Galaxies" The Circumgalactic Medium (CGM) is where infalling gas that feeds star formation meets outflowing, feedback-enriched materials. It is where satellites are stripped and disrupted, and where gas ejected from galaxies may eventually be recycled. From absorption-line experiments, we know this medium takes the form of diffuse, ionized gas bound to the dark matter halo of its host galaxy and extending to at least 300 kpc. In this talk I will present two observationally-motivated puzzles that concern the physical and dynamical state of circumgalactic gas. First, I will review the evidence that the CGM of quenched galaxies contains as much cold gas as their star-forming counterparts. This observation implies that galaxies are transformed from star-forming disks to quiescent spheroids while retaining a significant store of cold gas in their halos. Then, I will show that under simple assumptions such as ionization equilibrium, the cool and warm phases of the CGM (T < 10^6 K) can account for most of the baryons purported to be missing from dark matter halos of both star-forming and passive galaxies with M_halo ~ 10^12. Yet, under these same assumptions, the cool (10^4 K) gas in the CGM is far from pressure equilibrium with a hot medium that could provide hydrostatic support. I will discuss recent progress and future survey data that not only address these problems but will ultimately enable a more complete picture of both the CGM and the cosmic web surrounding it. UCO/Lick Observatory host: Volker Bromm |
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Special Colloquium: "Insights into Galaxy Formation from z=15 to the Present Day" Space Telescope Science Institute (STScI) host: John Kormendy |
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"Towards a Complete Theory of Lyman-Alpha Transfer in and around Galaxies" University of Oslo: Institute of Theoretical Astrophysics host: Steve Finkelstein |
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Special Colloquium: "Three Problems in Trying to Form Galaxies (and how ISM Physics can Save Us)" Haverford College host: Chris Sneden |
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"The Local Universe as a Cosmology Laboratory" University of Maryland host: Volker Bromm |
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Special Colloquium: "New Tools for Galactic Archaeology from the Milky Way" Johns Hopkins University host: Adam Kraus |
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"Massive Galaxy Growth since Cosmic Noon" Max Planck Institut fur Extraterrestrische Physik host: Chris Sneden |
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Tinsley Visiting Professor "David vs. Goliath: Exploiting the Black Hole Mass Scale to Better Constrain Accretion Physics" University of Amsterdam host: Pawan Kumar |
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Spring Break: March 16 - 20: no Colloquium being held this week. |
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"MOSFIRE: the Multi-Object Spectrometer for Infrared Exploration at Keck Observatory" University of California, Los Angeles host: Gregory Mace |
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Tinsley Visiting Scholar: Stars Group "SPHERE: the New High-contrast Imager for the ESO-VLT" INAF - Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Padova, Italy host: Chris Sneden |
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No talk scheduled. |
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"Star-Formation Driven Molecular Superwinds as Understood from the Two Nearest Starburst Galaxies (and a Small Survey)" Ohio State University host: Neal Evans |
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Qualifying Exam/2nd-Year Defense "Chemical Analyses of Metal-Poor Stars: A New Approach" University of Texas at Austin | |
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"Tracking Planet Footprints in Dusty Disks" Boston University host: Adam Kraus |
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Qualifying Exam/2nd-Year Defense "Connecting the Dots: Tracking Galaxy Evolution at 3 <= z <= 7 using Fixed Cumulative Number Density in SPH Simulations" University of Texas at Austin | |
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Tinsley Visiting Scholar: Extragalactic Group "Early Galaxies: Alive, Dead, Transitioning and/or Active" Max Planck Institut fur Extraterrestrische Physik host: Shardha Jogee |
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PhD Defense "Innovative Technologies for - and Observational Studies of - Star and Planet Formation" University of Texas at Austin |
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Qualifying Exam/2nd-Year Defense "External Inverse-Compton Emission from Jetted Tidal Disruption Events" University of Texas at Austin |
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PhD Defense "On the Nature of Emission from Relativistic Jets" University of Texas at Austin |
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Qualifying Exam/2nd-Year Defense "The Structure of Class 0 Protostars: BHR71 in Herschel View" University of Texas at Austin |
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Qualifying Exam/2nd-Year Defense "Do Metal-Polluted Stars of the ZZ Ceti Instability Strip Have a Distinct Asteroseismic Signature?" University of Texas at Austin |
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Qualifying Exam/2nd-Year Defense "Peering Inside Galaxies in the First Two Billion Years" University of Texas at Austin |
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"Signatures of Neutron Star Mergers" Columbia University host: Pawan Kumar |
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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