0 Assigned ID: 184 ----- Attempting Submission 1 (Wed Mar 04 21:19:33 GMT 2020) ----- HST Phase I Proposal 184 successfully submitted. Receipt: # 184-1 ----- Attempting Submission 2 (Fri Mar 06 21:41:55 GMT 2020) ----- The standard paradigm of galaxy evolution assumes the circumgalactic medium (CGM) is primarily composed of hot gas in hydrostatic equilibrium (HSE) within the gravitational potential of the galaxy's halo. However, COS observations challenge this paradigm by finding a larger quantity of cool gas in the CGM of L* galaxies than expected. Recent analytic models that reconcile the cool gas mass budgets with the assumption of HSE are in tension with CGM simulations, which show large deviations from HSE driven by inflows, outflows, and turbulence. A successful model of the CGM will thus need to account for the contribution of these motions, not just gas pressure, to its long-term dynamic equilibrium. We propose developing a new CGM support model based on quantified contributions of outflows, accretion, and turbulence to the overall support of gas, rather than imposing HSE. We will use the high-resolution Figuring Out Gas & Galaxies in Enzo (FOGGIE) zoom-in simulations to identify spatially distinct regions of the CGM (e.g. outflows vs. accretion) and characterize turbulent motions and rotation. We will determine how the dynamical equilibrium of CGM gas depends on physical properties of galaxies, including outflow rate, accretion rate, redshift, and halo mass. We will perform a controlled experiment by repeating the full analysis on a restarted FOGGIE run with elevated feedback. For all runs we will use synthetic absorption spectra to explore how the flows that hold up the CGM against gravity are reflected in the observations. The new model and synthetic data together will be directly applicable to the interpretation of past and future COS quasar absorption line spectra. PI Lochhaas has experience analyzing CGM simulations, as shown by Lochhaas et al. (2020), in which a similar analysis was carried out as is proposed. Co-Is Peeples, Tumlinson, and O'Shea are the co-PIs of the FOGGIE suite of simulations and thus have experience in both running and analyzing the FOGGIE simulations. Co-I Zheng has experience analyzing the FOGGIE simulations and in producing synthetic observations, as shown by Zheng et al. (2020) - FOGGIE III. The Mocky Way: Investigating Biases in Observing the Milky Way's Circumgalactic Medium (arXiv:2001.07736). Intergalactic Medium and the Circumgalactic Medium 0 Regular false false false true false SUPPORTED