The Circumgalactic Medium from the CAMELS Simulations: Forecasting Constraints on Feedback Processes from Future Sunyaev-Zeldovich Observations

Kavli Affiliate: Mark Vogelsberger

| First 5 Authors: Emily Moser, Nicholas Battaglia, Daisuke Nagai, Erwin Lau, Luis Fernando Machado Poletti Valle

| Summary:

The cycle of baryons through the circumgalactic medium (CGM) is important to
understand in the context of galaxy formation and evolution. In this study we
forecast constraints on the feedback processes heating the CGM with current and
future Sunyaev-Zeldovich (SZ) observations. To constrain these processes, we
use a suite of cosmological simulations, the Cosmology and Astrophysics with
MachinE Learning Simulations (CAMELS), that varies four different feedback
parameters of two previously existing hydrodynamical simulations, IllustrisTNG
and SIMBA. We capture the dependencies of SZ radial profiles on these feedback
parameters with an emulator, calculate their derivatives, and forecast future
constraints on these feedback parameters from upcoming experiments. We find
that for a DESI-like (Dark Energy Spectroscopic Instrument) galaxy sample
observed by the Simons Observatory all four feedback parameters are able to be
constrained (some within the $10%$ level), indicating that future observations
will be able to further restrict the parameter space for these sub-grid models.
Given the modeled galaxy sample and forecasted errors in this work, we find
that the inner SZ profiles contribute more to the constraining power than the
outer profiles. Finally, we find that, despite the wide range of AGN feedback
parameter variation in the CAMELS simulation suite, we cannot reproduce the tSZ
signal of galaxies selected by the Baryon Oscillation Spectroscopic Survey as
measured by the Atacama Cosmology Telescope.

| Search Query: ArXiv Query: search_query=au:”Mark Vogelsberger”&id_list=&start=0&max_results=10

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