Speaker
Description
Feedback from cosmic rays (CRs) is expected to contribute to the regulation of star-formation in the ISM and the acceleration of a galactic outflow. The impact of CRs, however, depends on the microphysical transport processes. We run high-resolution "tallbox" simulations of the multiphase interstellar medium (ISM) and galactic wind using the moving mesh magnetohydrodynamics code AREPO, the CRISP feedback model, and varied configurations of our two-moment CR transport model. We find that CRs are able to supply energy to a global-scale wind, whereas a purely thermal wind de-energizes at 3 kpc above the disk midplane. Ion-neutral damping (IND) alters CRs' contribution to feedback by decoupling CRs from cold gas in the ISM and galactic wind. Despite this decoupling, CRs with IND are able to provide effective feedback with a moderate star formation rate, intermediate mass loading factor, and high CR energy loading factor. We also demonstrate the impact of CR feedback on star-forming gas and the formation of bound star clusters. We find that IND reduces the impact of CRs on the star formation rate. These high-resolution simulations are able to probe new observable constraints for CR transport and the role of CRs in determining the steady-state of the ISM.
