Probing the Circum-Galactic Medium with Fast Radio Bursts: Insights from the CAMELS Simulations

Abstract

Most diffuse baryons, including the circumgalactic medium (CGM) surrounding galaxies and the intergalactic medium (IGM) in the cosmic web, remain unmeasured and unconstrained. Fast Radio Bursts (FRBs) offer an unparalleled method to measure the electron dispersion measures (DMs) of ionized baryons. Their distribution can resolve the missing baryon problem, and constrain the history of feedback theorized to impart significant energy to the CGM and IGM. We analyze the Cosmology and Astrophysics in Machine Learning (CAMEL) Simulations, using three suites: IllustrisTNG, SIMBA, and Astrid, each varying 6 parameters (2 cosmological & 4 astrophysical feedback), for a total of 183 distinct simulation models. We find significantly different predictions between the fiducial models of the suites, owing to their different implementations of feedback. SIMBA exhibits the strongest feedback, leading to the smoothest distribution of baryons, reducing the sightline-to-sightline variance in DMs between z=0-1. Astrid has the weakest feedback and the largest variance. We calculate FRB CGM measurements as a function of galaxy impact parameter, with SIMBA showing the weakest DMs due to aggressive AGN feedback and Astrid the strongest. Within each suite, the largest differences are due to varying AGN feedback. IllustrisTNG shows the most sensitivity to supernova feedback, but this is due to the change in the AGN feedback strengths, demonstrating that black holes, not stars, are most capable of redistributing baryons in the IGM and CGM. We compare our statistics directly to recent observations, paving the way for the use of FRBs to constrain the physics of galaxy formation and evolution.

15 pages, 7 figures, Accepted to ApJ

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• Quantifying Baryonic Feedback on Warm-Hot Circumgalactic Medium in CAMELS Simulations
• X-raying CAMELS: Constraining Baryonic Feedback in the Circum-Galactic Medium with the CAMELS simulations and eRASS X-ray Observations
• FRB Line-of-sight Ionization Measurement From Lightcone AAOmega Mapping Survey: the First Data Release
• Modeling the Cosmic Dispersion Measure in the D < 120 Mpc Local Universe
• Introducing the Descriptive Parametric Model: Gaseous Profiles for Galaxies, Groups, and Clusters
• Exploring selection biases in FRB dispersion-galaxy cross-correlations with magnetohydrodynamical simulations
• Magnetic fields in galactic environments probed by Fast Radio Bursts
• Probing baryonic feedback with fast radio bursts: joint analyses with cosmic shear and galaxy clustering