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Past Colloquia

New Insights into the Interstellar Medium in our Neighbor M31

Cody Hall

Karin Sandstrom (University of Arizona)

March 06, 2015
14:00 - 15:00

As the nearest metal-rich, star-forming galaxy to the Milky Way, M31 plays a key role in understanding the interstellar medium (ISM) and star formation at z~0. Because of its proximity, we can study the properties of the ISM on the scale of individual star-forming molecular…

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Double Feature: “SZ with AGN” and “The Cosmology Large Angular Scale Surveyor”

Cody Hall

Tobias Marriage (Princeton)

February 13, 2015
14:00 - 15:00

Part 1: Evidence is mounting that Active Galactic Nuclei (AGN) are responsible for the lack of star-formation in the most massive galaxies. Attention has been drawn to the role of energetic radio-mode feedback from the AGN in heating the gas around massive halos and preventing…

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Exotic Supernovae and Tidal Disruption Events from the Pan-STARRS1 Survey

Cody Hall

Ryan Chornock (Ohio University)

February 06, 2015
14:00 - 15:00

The Pan-STARRS1 (PS1) project was a five-band optical survey of the northern sky that recently finished operations after taking data for more than four years. One of the primary scientific drivers was to perform a deep time-domain survey of ten 7 sq. deg. fields. Our…

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Extrasolar Weather and Dust: on the Occurrence of Great Red Spots and Asteroid Belts

Cody Hall

Stanimir Metchev (The University of Western Ontario)

January 30, 2015
14:00 - 15:00

The detection of global weather phenomena in irradiated extrasolar hot Jupiters has provided tremendous insights into their atmospheric structure. Non-irradiated substellar atmospheres probe weather in an entirely different regime, where global atmospheric flows result primarily from a combination of rapid rotation and internal convection –…

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Variable Stars as Precision Distance Indicators: From the Local Group to the Hubble Constant

Cody Hall

Vicky Scowcroft (Carnegie Observatories)

January 23, 2015
14:00 - 15:00

Variable stars have been used as distance indicators for the past 100 years, but it is only in the last few years that we have truly reached the era of “precision” distance indicators. In this talk, I will discuss my work using mid infrared observations…

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The Dynamical Mass in Spiral Disks

Cody Hall

Matthew Bershady (University of Wisconsin-Madison)

January 16, 2015
14:00 - 15:00

A small fraction of the universe’s energy-density is comprised of normal matter. A still smaller fraction is bound into stars and gas that we can see and are responsible for life. This talk examines what we know about the baryon content in galaxies thought to…

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Reconstructing the Formation Histories of Massive Galaxies

Cody Hall

Mariska Kriek (UC Berkeley)

January 09, 2015
14:00 - 15:00

In past years, large and deep photometric and spectroscopic surveys have significantly advanced our understanding of galaxy growth, from the most active time in the universe (z~2) to the present day. In particular, the evolution in stellar mass, star formation rate, and structure of complete…

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Gas Clouds Where They Should Not Be, and Other Recent Discoveries of the Green Bank Telescope

Cody Hall

Felix J. (Jay) Lockman (National Radio Astronomy Observatory, Green Bank)

December 09, 2014
14:00 - 15:00

In this talk I’ll review some recent discoveries made with the Green Bank Radio Telescope in areas ranging from the structure of the Lunar surface, to astrochemistry, pulsar physics, rocks in Orion, and cosmology.   The special focus will be on current work on the…

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Eighth Karl W. Kamper Memorial Lecture: The radio sky at 1000 frames per second: Discovery of the Fast Radio Bursts and Millisecond Pulsars

Cody Hall

Matthew Bailes (Swinburne University of Technology)

December 05, 2014
14:00 - 15:00

Seven years ago Lorimer et al. (2007) reported the discovery of what appeared to be the first bona fide case of an extragalactic dispersed radio burst, with an estimated peak flux of 30 Jy. Known as the Lorimer burst, it failed to repeat but had…

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X-ray observations of active galactic nuclei

Cody Hall

Luigi Gallo (Saint Mary's University)

November 28, 2014
14:00 - 15:00

X-ray observations of active galactic nuclei (AGNs) reveal the physics at work in the region closest to the black hole event horizon. I will discuss some of the most sensitive X-ray observations of AGNs and describe the processes responsible for the complex spectral appearance and…

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