This is a talk held during the regular colloquium series (usually Tuesdays at 4pm).
On New Year’s Day in 1925, a young Edwin Hubble released his finding that our universe was far bigger than previously believed. Six years later, in a series of meetings at Mt.
I will discuss recent studies of both strongly lensed sources, and the foreground lens population (primarily groups and cluster of galaxies), framed by an overview of str
Although weakly interacting massive particles (WIMPs) have long been the leading class of candidates for the dark matter of our universe, the lack of a confirmed detectio
The circumgalactic medium (CGM) not only holds the majority of a galactic halo’s baryons, but it is an essential piece of the puzzle for the understanding of how galaxies form and evolve. I will divide my talk into three portions, and use hydrodynamic simulations to help address central question
Our understanding of the dynamics of our Local Group of galaxies has changed dramatically over the past few years owing to significant advancements in astrometry and our theoretical understanding of galaxy structure.
Deriving accurate ages of stars is one of the most important, if elusive, goals of modern-day astrophysics. In this talk, I will review some of the techniques that have been used to infer such ages, with emphasis on the oldest stars.
Debris disks may be the signposts of recent planet formation. The dust, which is generated in collisional cascades of asteroids and comets, is enhanced by the gravitational stirring of gas giant planets.