How do galaxies evolve over cosmic time?
How do they build and use their gaseous reservoirs?
We probe the circumgalactic medium (CGM), which surrounds every galaxy out to 100 times the size of their stellar disks.
We measure how much gas is there, what it is made of, and how it is moving.
By comparing the gas properties to host galaxy properties, we determine whether and how the gas is accreting onto or outflowing from the galaxies.
June 2025: Welcome to the new OU CGM Group website! The group has recently grown to include 3 graduate students, 3 undergraduate students, and will be welcoming 2 new postdocs in the second half of 2025. See who we are!
We published an exciting paper in Nature Astronomy in September 2024, which mapped the CGM in emission around a nearly face-on starbursting galaxy (free access to the paper on arXiv.org). It collected quite a bit of media attention, including several tv/radio/podcast interviews with Dr Nielsen!
If you're looking for MAGIICAT data, you're in luck. It has migrated with us! Click on Trixie the MAGIICAT on the left for a shortcut.