Resubmission. 1906278959 Assigned ID: 4766 ----- Attempting Submission 1 (Wed May 24 22:47:48 GMT 2023) ----- HST Phase I Proposal 4766 successfully submitted. Receipt: # 4766-1 ----- Attempting Submission 2 (Wed May 24 23:55:37 GMT 2023) ----- We propose the creation of a descriptive parametric model for the circumgalactic medium (CGM) based on multi-waveband observations, centralized on Hubble's UV capabilities and extending to new probes observing the warm-hot gas phase around galaxies for the first time. Large databases of UV data measuring cool 10^4 K phase embedded in an ''atmosphere'' observed via high ionization UV lines now exist. These CGM measurements from Hubble are now being complemented by probes of the hotter CGM, including Fast Radio Bursts, Sunyaev-Zel'dovich detections, and X-ray emission. The novelty of our proposed model will be its flexible integration of multi-wavelength, multi-platform observations into a Bayesian framework for error propagation and parameter estimation. Conservative error propagation is essential for this model to return realistic profiles and their uncertainties. The accelerated timeframe upon which the model will be built and disseminated to the community is driven by its capability to generate easily usable models and even predictions for new observing endeavors. The base model is built upon observations of L* halos in the low-redshift Universe. However, the ultimate use will be a unified model that extends up to massive groups and back in time to redshift of one. The descriptive parametric model is built explicitly to 1) avoid rely on any single theoretical assumption and 2) to provide flexibility beyond cosmological simulations that are shown to fail to reproduce well-observed halo profiles. Benjamin Oppenheimer is an expert in cosmological hydrodynamic simulations, forward modelling UV absorption and X-ray emission from these simulations, and developing theoretical models for gaseous halos. He is a co-author on the Chadayammuri (2022) on the eROSITA detection of X-ray emission around L* galaxies, and ran the theoretical simulation models using pyXSIM used in that paper. He is a member of the X-GAP team (XMM Program 090389, approved late 2021, PI Eckert), and has early access to this data. Mark Voit is a leading developer of the parametric model we propose to apply to Hubble UV observations here. He has developed the precipitation model based on X-ray observations of clusters, and has more recently applied his preciptation model to the CGM surrounding normal galaxies. Yannick Bah\'e is an expert in hydrodynamical simulations of massive haloes. Amongst others, he has led the Hydrangea/C-EAGLE cluster simulations that constitute a comparison benchmark for our proposed parametric model Nicholas Battaglia is a theoretical cosmologist who is a leading expert in Sunyaev-Zel'dovich models and observations. Joseph Burchett is an observer of UV absorption and a frequent user of the Cosmic Origins Spectrograph. He is a leading expert in observations of absorption in galaxy groups. Justus Gibson is a PhD candidate CU Boulder who worked with Oppenheimer in developing a Bayesian fitting model of the extreme UV slope of the ionization background of Lyman-limit absorbers. His expertise is essential for the parametric model in terms of Bayesian regression and low-ion column densities for different UVB fields. He successfully passed his Comps II (with honors) and his paper Gibson et al. (2022) forms the basis for our maximum likelihood analysis of UV absorbers. Cameron Hummels is an expert in cosmological hydrodynaimc simulations and mock quasar absorption sightlines with his Trident code. He has also developed analytical models for the CGM. Mary Putman is an observer of gaseous environments spanning from the Galactic HVCs and Local Group dwarfs to UV absorption in clusters. She led a 2012 ARAA review of titled "Gaseous Galaxy Halos." Ming Sun is an X-ray observer who has published Chandra observations of X-ray groups. Jessica Werk is an observer of UV absorption via Hubble spectrographs. She derived UV absorption-based measure of CGM density and therefore pressure assuming 10^4 K in her 2014 paper. She is the PI of many successful Hubble COS programs. Joel N. Bregman is a Professor at the University of Michigan and he has spent his career working on various issues of the diffuse medium in galaxies and clusters, both from theoretical and observational studies. He has experience with a range of orbiting observatories in the X-rays, UV, IR, and recently in the radio (Planck) for Sunyaev-Zeldovich studies. He recently published the detection of nearby L^* halos via the thermal Sunyaev-Zel'dovich (tS-Z) Effect, where he and his group re-analyzed Planck maps. His group has further analysis of tS-Z maps out to 50 Mpc in process. Intergalactic Medium and the Circumgalactic Medium 0 Regular false false true true false false SUPPORTED