Modeling Photoionized Turbulent Material in the Circumgalactic Medium III: Effects of Co-rotation and Magnetic Fields
arXiv:2201.09325 · doi:10.3847/1538-4357/ac4bc2
Abstract
Absorption-line measurements of the circumgalactic medium (CGM) display a highly non-uniform distribution of lower ionization state species accompanied by more widespread higher ionization state material. This suggests that the CGM is a dynamic, multiphase medium, such as arises in the presence of turbulence. To better understand this evolution, we perform hydrodynamic and magneto-hydrodynamic (MHD) simulations of the CGM surrounding Milky Way-like galaxies. In both cases, the CGM is initially in hydrostatic balance in a solar masses dark matter gravitational potential, and the simulations include rotation in the inner halo and turbulence that decreases radially. They also track ionizations, recombinations, and species-by-species radiative cooling in the presence of the redshift-zero UV background, employing the MAIHEM non-equilibrium chemistry package. We find that after 9 Gyrs of evolution, the presence of a magnetic field leads to an overall hotter CGM, with cool gas in the center where magnetic pressure dominates. While the non-MHD run produces more cold clouds overall, we find similar Si IV/O VI and N V/O VI ratios between the MHD and non-MHD runs, which are both very different from their equilibrium values. The non-MHD halo develops cool, low angular momentum filaments above the central disk, in comparison to the MHD run that has more efficient angular momentum transport, especially for the cold gas which forms a more ordered and extended disk late into its evolution.
24 pages, 16 figures
References in corpus (24)
- The Circumgalactic Medium
- Concentration, Spin and Shape of Dark Matter Haloes as a Function of the Cosmological Model: WMAP1, WMAP3 and WMAP5 results
- Strong magnetic fields in normal galaxies at high redshifts
- Draping of Cluster Magnetic Fields over Bullets and Bubbles -- Morphology and Dynamic Effects
- Raining on black holes and massive galaxies: the top-down multiphase condensation model
- The COS-Halos Survey: Origins of the Highly Ionized Circumgalactic Medium of Star-Forming Galaxies
- Resolving small-scale cold circumgalactic gas in TNG50
- Current status of turbulent dynamo theory: From large-scale to small-scale dynamos
- A Global Probe of Cosmic Magnetic Fields to High Redshifts
- On the amplification of magnetic fields in cosmic filaments and galaxy clusters
- Metal-enriched, sub-kiloparsec gas clumps in the circumgalactic medium of a faint z = 2.5 galaxy
- Quasars Probing Galaxies: I. Signatures of Gas Accretion at Redshift Approximately 0.2
- Cooling flow solutions for the circumgalactic medium
- COS-Burst: Observations of the Impact of Starburst-Driven Winds on the Properties of the Circum-Galactic Medium
- Highly efficient star formation in NGC 5253 possibly from stream-fed accretion
- Faraday Rotation from Magnesium II Absorbers towards Polarized Background Radio Sources
- Multiphase gas in the circumgalactic medium: relative role of and density fluctuations
- Direct Insights into Observational Absorption Line Analysis Methods of the Circumgalactic Medium Using Cosmological Simulations
- A small-scale dynamo in feedback-dominated galaxies - III. Cosmological simulations
- Constraining Magnetic Fields in the Circumgalactic Medium
- Atomic Chemistry In Turbulent Astrophysical Media I: Effect of Atomic Cooling
- The Effect of Turbulence on Nebular Emission Line Ratios
- Modeling Photoionized Turbulent Material in the Circumgalactic Medium II: Effect of Turbulence within a Stratified Medium
- Interpreting Observations of Absorption Lines in the Circumgalactic Medium with a Turbulent Medium