title

Past Colloquia

Dwarf Galaxies: The Nexus of Dark Matter and Chemical Evolution

Cody Hall

Evan Kirby (UC Irvine)

February 18, 2014
14:00 - 15:00

The Local Group’s dwarf galaxies are near enough for exquisitely detailed, resolved stellar spectroscopy and diverse enough to conduct experiments on dark matter and chemical evolution.  I have collected medium-resolution spectra for thousands of stars in many dwarf galaxies in the Local Group.  Innovative techniques…

Read More »

How to Build a Big Galaxy

Cody Hall

Adam Muzzin (Leiden)

February 12, 2014
14:00 - 15:00

The most massive galaxies in the universe are rare, but because of this, their formation history imposes some of the strongest constraints on our models of galaxy formation.  In the local universe, massive galaxies like M87 appear relatively dull, with elliptical morphologies, old stars, and…

Read More »

The E-Nova Project: A Multi-Wavelength Initiative to Probe Mass Ejection in Novae

Cody Hall

Laura Chomiuk (Michigan State U)

February 07, 2014
14:00 - 15:00

When imagining a nuclear explosion, we often picture strong, spherical shock waves, like a bomb or supernova; however, nature’s most common thermonuclear explosions look nothing like this, showing delayed and multiple phases of mass ejection that can last for months after the nuclear fuel is ignited. These…

Read More »

The chemo-dynamical structure of the Milky Way

Cody Hall

Jo Bovy (IAS)

February 03, 2014
14:00 - 15:00

Observations of the structure and dynamics of different stellar populations in the Milky Way’s disk provide a unique perspective on disk formation, evolution, and dynamics. I will review our current knowledge of the chemo-orbital structure of the disk and its implications for our understanding of…

Read More »

Baryonic physics in galaxy evolution as seen by the CALIFA survey

Cody Hall

Jakob Walcher (Potsdam)

January 31, 2014
14:00 - 15:00

Ironically, while the predictions on the dark side of the cosmological “concordance” model LambdaCDM are well understood theoretically, many open questions in cosmology and galaxy evolution revolve around the difficult physics of the luminous, baryonic matter. The Calar Alto Legacy Integral Field Area Survey (CALIFA)…

Read More »

Terrestrial Aftermath of Moon-forming Impact to Plate tectonics and habitability

Reichman Family Lecture Hall (ES1050)

Norman Sleep (Stanford)

January 24, 2014
14:00 - 15:00

Earth’s mantle was mostly molten after the Moon-forming impact. We assume that Earth had total CO2 and water inventories comparable to the modern ones. These volatiles entered the atmosphere, which soon became opaque and radiated at the runaway greenhouse threshold. The Moon caused strong Earth…

Read More »

Assessing the Role of Stellar Feedback from Small to Large Scales

Cody Hall

Laura Lopez (MIT)

January 22, 2014
14:00 - 15:00

Stellar feedback has a profound influence in many astrophysical phenomena, yet it is often cited as one of the biggest uncertainties in galaxy formation models today. This uncertainty stems from a dearth of observational constraints as well as the great dynamic range between the small…

Read More »

Galaxy Kinematics through Integral Field Spectroscopy

Cody Hall

David Law (Dunlap Institute)

January 15, 2014
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…

Read More »

Radio Polarimetry and the Magnetic Universe

Cody Hall

Bryan Gaensler (CAASTRO / The University of Sydney)

January 10, 2014
14:00 - 15:00

A remarkable discovery made by 20th century astronomers was that the Universe is threaded with magnetic fields. Furthermore, these magnetic fields typically do not have a random, tangled, morphology, but are surprisingly organised and coherent. However, the processes that create and then sustain this large-scale…

Read More »

Resolving Black Holes with the Event Horizon Telescope

Cody Hall

Shep Doeleman (MIT Haystack & Harvard-Smithsonian CfA)

December 20, 2013
14:00 - 15:00

A convergence of high bandwidth radio instrumentation and newly accessible mm and submm wavelength facilities are enabling assembly of the Event Horizon Telescope (EHT): a short-wavelength Very Long Baseline interferometry (VLBI) array with the capability of observing the nearest supermassive black holes with Schwarzschild Radius…

Read More »