title

Past Colloquia

Photodynamics: revealing the secrets of the lowest-mass planets and stars

Cody Hall

Josh Carter (CfA)

March 01, 2013
14:00 - 15:00

Eclipsing systems are famous for providing abundant opportunities to study the basic properties of stars and planets — but eclipsing systems with more than two bodies present truly extraordinary opportunities. This is because non-Keplerian effects can be observed and used to  determine precise masses, radii,…

Read More »

Galaxy Clusters During the Era of Cluster Formation

Cody Hall

Anthony Gonzalez (UFL)

February 15, 2013
14:00 - 15:00

The redshift regime 1<z<2 corresponds to the epoch during which the first massive galaxy clusters assemble. It is also during this era that the present day star-formation density relation is established, with star formation rates in cluster galaxies decreasing to well below the field level….

Read More »

Astrometry and Adaptive Optics Enables Tests of Star Formation in Extreme Environments

Cody Hall

Jessica Lu (U of Hawaii)

February 13, 2013
14:00 - 15:00

Ground-based telescopes equipped with adaptive optics systems have overcome the blurring effects of the Earth’s atmosphere and now routinely provide diffraction-limited images at infrared wavelengths. This has led to a revolution in astrometry, and we can now measure stars’ relative positions with 150 micro-arcsecond precision,…

Read More »

Detecting and Characterizing Exoplanets with a New Generation of Sky Surveys

Cody Hall

Nicholas Law (Dunlap)

February 06, 2013
14:00 - 15:00

Modern optical sky surveys like the Palomar Transient Factory and Pan-STARRs open new windows into a vast and dynamic sky, and their enormous datasets demand dramatic improvements in both data-mining algorithms and follow-up instrumentation. I will describe Robo-AO, a recently-commissioned robotic laser adaptive optics system,…

Read More »

Galactic Dynamics and the Nature of Dark Matter

MP 102

Matthew Walker (Harvard)

February 04, 2013
15:00 - 16:00

I will explain how to use the motions of stars to learn about the nature of particles.  More specifically, I will translate the stellar kinematics that I observe in the nearest, smallest and `darkest’ galaxies into a test of the standard hypothesis that dark matter…

Read More »

The New Era of Exoplanet Direct Imaging

Cody Hall

Sasha Hinkley (Caltech)

January 31, 2013
15:00 - 16:00

Most of the hundreds of extrasolar planets identified in the past 15 years have been detected indirectly—through careful monitoring of the planets’ effect on their host star’s light. By overcoming the extremely large brightness contrast between the stars and their faint exoplanetary companions, we are…

Read More »

What Shuts Down Star Formation in Galaxies?

Cody Hall

Alison Coil (UC San Diego)

January 25, 2013
14:00 - 15:00

The main question I will address in my talk is what shuts down star formation in galaxies.  I will highlight recent observational work on outflowing galactic-scale winds and the potential impact of these winds on star formation in galaxies.  I will present new work on which galaxies…

Read More »

The highest redshift starburst galaxies revealed by the South Pole Telescope, ALMA, and gravitational lensing

Cody Hall

Scott Chapman (Dalhousie)

January 18, 2013
14:00 - 15:00

The South Pole Telescope has systematically identified large numbers of high-redshift strongly gravitationally lensed systems. These sources are selected by their extreme mm flux, which is largely independent of redshift and lensing configuration. I will report results from the first blind redshift survey undertaken with…

Read More »

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…

Read More »

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 <…

Read More »