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AR 15046 (Archival Research)

Sun Jul 14 21:08:50 GMT 2024

Principal Investigator: Thomas Quinn
PI Institution: University of Washington
Investigators (xml)

Title: Cosmic Ray driven outflows and the structure of the CGM
Cycle: 25

Abstract
The circumgalactic medium (CGM) is a dynamically complex, diffuse multiphase gas that extends to the virial radius of galaxies. The interplay in the CGM between outflows from the star-forming disk and inflows form the intergalactic medium (IGM) provides constraints to theories of galaxy formation and evolution. Due to its faint nautre, the CGM is difficult to observe and has only recently been considered to play a major role in galaxy evolution. The mass structure and kinematics of the CGM are strongly influenced by galactic outflows. Recent simulations have shown that including cosmic rays (CRs) in stellar feedback prescriptions results in more effective galactic winds that better match observations compared to thermal feedback alone. Here we propose a systematic study of the effect of CR driven galactic outflows on the CGM by simulating a suite of isolated disk galaxies for which anisotropic CRs are dynamically important with the goal of reproducing the observed temperature and pressure structure of the CGM, understanding the galactic recycling process of metals, and determining the role of CR-driven outflows on star formation history.