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Masters Presentation: The RESOLVE G3 Group Finding Algorithm and the HI Masses of Galaxy Groups at z~0

September 30 @ 1:00 pm - 2:00 pm

The RESOLVE G3 Group Finding Algorithm and the HI Masses of Galaxy Groups at z~0

Galaxy groups, systems of galaxies occupying a common dark matter halo, are dynamic environments where processes such as large-scale gas accretion, merging, and feedback can have a tremendous impact on the cold atomic hydrogen (HI) reservoirs of galaxies. We present the RESOLVE Gas in Galaxy Groups (G3) group finding algorithm, a new technique for identifying galaxy groups. The G3 algorithm has been prototyped for translation to higher redshift surveys (z~0.5) such as LADUMA (Looking At the Distant Universe with the MeerKAT Array), which will soon provide the first opportunity to directly observe cosmic evolution in the relationship between HI and group environment. We use mock galaxy catalogs to optimize and analyze the performance of the G3 algorithm and show that it improves upon traditional group finding algorithms such as “friends-of-friends”. Finally, we apply the G3 group finder to the RESOLVE and ECO surveys to probe the relationship between group HI mass and group halo mass at z~0. This work serves as the foundation for evolutionary comparisons to higher redshift, as well as for further studies of group multiphase gas scaling relations at z~0.

Zoom Connection

https://unc.zoom.us/j/98943283015?pwd=eDRBSWZ2NXV4RW9Za09yK0ZmdS9xZz09

Meeting ID: 989 4328 3015

Passcode: 606436

Details

Date:
September 30
Time:
1:00 pm - 2:00 pm

Venue

Zoom