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- W3036770410 abstract "The circumgalactic medium (CGM) of nearby star-forming galaxies shows clear indications of O vi absorption accompanied by little to no detectable N v absorption. This unusual spectral signature, accompanied by highly nonuniform absorption from lower-ionization-state species, indicates that the CGM must be viewed as a dynamic, multiphase medium, such as occurs in the presence of turbulence. Motivated by previous isotropic turbulent simulations, we carry out chemodynamical simulations of stratified media in a Navarro–Frenk–White (NFW) gravitational potential with a total mass of 1012 M⊙ and turbulence that decreases radially. The simulations assume a metallicity of 0.3 Z⊙ and a redshift-zero metagalatic UV background, and they track ionizations, recombinations, and species-by-species radiative cooling using the MAIHEM package. We compare a suite of ionic column densities with the COS-Halos sample of low-redshift star-forming galaxies. Turbulence with an average one-dimensional velocity dispersion of ≈40 km s−1, corresponding to an energy injection rate of ≈4 × 1049 erg yr−1, produces a CGM that matches many of the observed ionic column densities and ratios. In this simulation, the NN V/NO VI ratio is suppressed from its equilibrium value due to a combination of radiative cooling and cooling from turbulent mixing. This level of turbulence is consistent with expectations from observations of better constrained, higher-mass systems and could be sustained by energy input from supernovae, gas inflows, and dynamical friction from dark matter subhalos. We also conduct a higher resolution ≈40 km s−1 run, which yields smaller-scale structures but remains in agreement with observations." @default.
- W3036770410 created "2020-06-25" @default.
- W3036770410 creator A5025414438 @default.
- W3036770410 creator A5028683533 @default.
- W3036770410 creator A5067724277 @default.
- W3036770410 creator A5073236929 @default.
- W3036770410 date "2020-06-22" @default.
- W3036770410 modified "2023-10-16" @default.
- W3036770410 title "Modeling Photoionized Turbulent Material in the Circumgalactic Medium. II. Effect of Turbulence within a Stratified Medium" @default.
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