AR 17570 (Archival Research)

Sat Jul 20 10:51:46 GMT 2024

Principal Investigator: Benjamin Oppenheimer
PI Institution: University of Colorado at Boulder
Investigators (xml)

Title: A Novel Descriptive Parametric Model of Gaseous Atmospheres
Cycle: 31

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.