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Past Colloquia

Las Cumbres Observatory: Building a global telescope network from the ground up

Cody Hall

Edward Gomez (LCOGT)

January 11, 2013
14:00 - 15:00

We are building a global network of telescopes which will be available to both professional scientists and the science curious public. Our telescope network will be a homogeneous group, evenly spaced in northern and southern hemispheres for maximum night sky coverage. As well as undertaking…

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The Ecology of Galaxy Formation Within the “Cosmic Web”

Cody Hall

Chuck Steidel (Caltech)

December 07, 2012
14:00 - 15:00

I will discuss recent results from the “Keck Baryonic Structure Survey”, a unique survey of the high redshift universe optimized for sensitivity to both forming galaxies and the surrounding gas-phase circumgalactic and intergalactic baryons (and the exchange between the two) at 2 < z <…

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The Formation of Massive Galaxies

Cody Hall

Pieter van Dokkum (Yale)

November 30, 2012
14:00 - 15:00

Owing to large surveys with the Hubble Space Telescope and ground-based telescopes we now have high resolution snapshots of the Universe dating back to only a few hundred million years after the Big Bang. The challenge now is to use this wealth of data to…

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Hydrodynamics of nuclear combustion for stars from the early Universe

Cody Hall

Falk Herwig (U of Victoria)

November 23, 2012
14:00 - 15:00

Stellar evolution at very low and zero metallicity features convective mixing of proton-rich material into convective 12C-rich He-burning regions. During such events nuclear and convective mixing time scales are similar and substantial nuclear energy release into the hydrodynamic flow implies a combustion regime that can…

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From voids to clusters: HI imaging surveys of galaxies in different environments

Cody Hall

Jacqueline van Gorkom (Columbia)

November 16, 2012
14:00 - 15:00

Our understanding of the formation and evolution of galaxies and the large scale structure has advanced enormously over the last decade, thanks to an impressive synergy between theoretical and observational efforts. While the growth of the dark matter component seems well understood, the physics of…

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Nature vs Nurture: Investigating the role of the environment in the assembly of galaxy stellar mass

Cody Hall

Tracy Webb (McGill)

November 09, 2012
14:00 - 15:00

Astrophysics is making important advancements in our understanding of the origin of structure in the universe – over all scales. Nevertheless, a comprehensive description of galaxy evolution remains elusive due to the complex baryonic physics involved and the inherent challenges of studying high-redshift galaxy populations….

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Fueling Cosmic Star Formation: The Molecular Interstellar Medium in High-Redshift Starburst Galaxies

Cody Hall

Dominik A. Riechers (Cornell)

November 02, 2012
14:00 - 15:00

Submillimeter galaxies (SMGs) are thought to represent the link between high-redshift star-forming galaxies and passive early type galaxies, with the huge merger driven bursts consuming up most of the available gas and driving the morphological transition to a spheroid. These hyper-luminous high-z galaxies commonly trace…

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Connecting Primordial Physics and Cosmological Observations

Cody Hall

Daniel Green (Stanford)

October 26, 2012
14:00 - 15:00

Inflation provides a compelling explanation of the observed features of the universe on cosmological scales. Yet, given the vast number of models, it may not be clear what precisely these observations tell us about the epoch of inflation. In this colloquium, I will explain how…

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Star Formation in Extreme Environments near Supermassive Black Holes and in Massive Star Clusters

Cody Hall

Jessica Lu (U of Hawaii)

October 19, 2012
14:00 - 15:00

The formation of stars is a fundamental astrophysical process; and yet we still debate whether it varies with environment. Milky Way young star clusters range in mass over four orders of magnitude; but, the best-studied star forming regions, such as Taurus and Orion, represent only…

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The Early Growth of Galaxies

Cody Hall

David Law (Toronto)

October 12, 2012
14:00 - 15:00

In the young universe, galaxies were blobby conglomerations of stars whose irregular structures were products of their dynamically violent environments.  Over time, star formation in these systems declined as the gas fraction dropped, and galaxies evolved into the spiral and elliptical structures with which we…

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