Welcome! I am Cassi Lochhaas, a computational astrophysicist.

NHFP Hubble Fellow at Smithsonian Astrophysical Observatory

A hundred years of observations of the galaxies in our Universe has revealed drastic differences in masses, sizes, shapes, and star formation activity across galaxy populations, and yet there are general trends and relations between these properties suggesting that galaxies evolve subject to a set of physical laws.

In the past couple decades, we have begun to expand our knowledge of galaxies to the invisible gas surrounding them, the circumgalactic medium (CGM). The CGM acts as a conduit between galaxies and the rest of the Universe, both regulating and fueling their growth.

My research focuses on understanding the physics governing the galaxy-CGM connection. I use high-resolution cosmological simulations of galaxy evolution combined with analytic modeling to build new physical intuition for the structure of the CGM and how it fits into the galaxy evolution story.

Check out the links below to see the various topics of my research!

Galactic Accretion through the CGM

Galactic Accretion through the CGM

I am currently working on understanding the properties of accretion filaments as they stream through (and are dispersed by) the CGM.

Stellar Feedback in Galaxy Simulations

Stellar Feedback in Galaxy Simulations

I am leading a new simulation initiative to develop a suite of galaxy simulations with differing prescriptions for stellar feedback to investigate the impact on the CGM.

Non-Equilibrium CGM

Non-Equilibrium CGM

My recent work has focused on exploring the many ways in which the CGM is not in virial or hydrostatic equilibrium.

Galactic Winds

Galactic Winds

I developed a galactic wind bubble model for my PhD thesis that is now being used to describe various peculiar observations!