Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session S01: Poster Session III (14:00-17:00)
Monday, April 15, 2019
Sheraton Room: Plaza Foyer
Abstract: S01.00009 : Mapping the Stellar Mass Content of Central Galaxies in Dark Matter Halos*
Megan R. Poremba
Coley M. Stillman
Daniel E. Finnegan
Kevin J. Napier
(University of Michigan)
The central galaxies in galaxy groups and clusters rank among the most massive galaxies in the universe, but a significant fraction of their stellar mass lies in the low surface-brightness and hard-to-detect outer envelope. We use new deep optical and mid-infrared imaging of a sample of more than 20,000 central galaxies obtained as part of the DESI Legacy Imaging Surveys (http://legacysurvey.org) to measure their azimuthally averaged stellar mass profiles and integrated stellar masses using state-of-the-art photometric and stellar population synthesis modeling techniques. We present new measurements of the stellar mass function and stellar mass-halo mass relation for central galaxies, and discuss the implications of our results for numerical simulations of star formation and feedback in massive galaxies.
*We gratefully acknowledge support from NSF grant AST-1616414.
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