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Past Colloquia

Probing Gravity: Galaxies, CMB Lensing, and Intensity Mapping

Cody Hall

Anthony Pullen (Carnegie Mellon)

January 15, 2016
14:00 - 15:00

We discuss recent work exploring the use of large-scale structure to probe gravity.  We first consider using CMB lensing and galaxy surveys to probe E_G, the ratio between curvature and velocity perturbations. This quantity is independent of galaxy clustering bias and is distinct for various…

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Sean McGee (Birmingham)

Cody Hall

Sean McGee (University of Birmingham)

December 18, 2015
14:00 - 15:00

details to follow

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Probing the Dark Halo of the Milky Way

Cody Hall

Nitya Kallivayalil (University of Virginia): Kamper Lecture

December 11, 2015
14:00 - 15:00

The Local Group, the regime in which detailed star-by-star studies can be done, is becoming a major testbed for the concordance Lambda (Dark Energy) + Cold Dark Matter model of our Universe. The dwarf galaxies of the Local Group, in particular, pose a variety of…

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The Large Synoptic Survey Telescope

Cody Hall

Steven M. Kahn (Stanford University and SLAC National Accelerator Laboratory)

December 04, 2015
14:00 - 15:00

The Large Synoptic Survey Telescope (LSST) is a large aperture, wide-field, ground-based telescope designed to provide a deep multicolor imaging survey of the entire southern hemisphere of sky every few nights.  As such, it will enable a wide variety of scientific investigations, all using a…

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Imaging the Invisible with the Little Canadian Radio Telescope that Could

Cody Hall

Jo-Anne Brown (University of Calgary)

November 27, 2015
14:00 - 15:00

Magnetic fields are an important constituent in the interstellar medium, but unlike gas, dust, and cosmic rays, they do not radiate, and consequently cannot be observed directly.  Instead, observers identify signatures of the field in an effort to piece together its topology.  Determining the structure of…

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Constraining the Physics of Satellite Quenching

Cody Hall

Mike Cooper (University of Californina Irvine)

November 20, 2015
14:00 - 15:00

Despite remarkable success at modeling the evolution of massive galaxies over cosmic time, modern hydrodynamic and semi-analytic models of galaxy formation fail to reproduce the properties of low-mass galaxies. This shortcoming in our theoretical picture is  largely driven by an inability to understand the physics…

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Tides and the interior structure of the Moon and icy satellites

Cody Hall

Isamu Matsuyama (LPL/Arizona)

November 13, 2015
14:00 - 15:00

The interior structure of a satellite determines its response to rotational and tidal forcing, which in turn affects its equilibrium shape and tidal heating. The unusual shape of the Moon given its present rotational and orbital state has been explained as due to a fossil…

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Globular Cluster Systems, Galaxy Halos, and Dark Matter

Cody Hall

Bill Harris (McMaster University)

November 06, 2015
14:00 - 15:00

We’ve known for 30+ years that galaxies are embedded in dark-matter halos that dominate their total mass.  But it has been difficult to find any visible stellar population that correlates in a simple way with DM halo mass. Systems of globular clusters have now been…

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Coevolution (Or Not) Of Supermassive Black Holes And Host Galaxies

Cody Hall

John Kormendy (University of Texas)

October 23, 2015
14:00 - 15:00

I review the observed demographics and inferred evolution of supermassive black holes (BHs) found by dynamical modeling of spatially resolved kinematics. Tight correlations between BH mass and the mass and velocity dispersion of the host-galaxy bulge have led to the belief that BHs and bulges…

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The Social Network Outburst: A Multiwavelength perspective on the 2015 V404 Cyg Outburst

Cody Hall

Greg Sivakoff (University of Alberta)

October 16, 2015
14:00 - 15:00

Accretion disks and jets are ubiquitous astrophysical phenomena. Given the potential feedback between supermassive black holes and galaxy evolution, understanding the physics of accretion discs and relativistic radio jets around Active Galactic Nuclei (AGN) has gained increased motivation; however, the outbursts of AGN likely last…

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