Matches in SemOpenAlex for { <https://semopenalex.org/work/W3037291232> ?p ?o ?g. }
- W3037291232 endingPage "4238" @default.
- W3037291232 startingPage "4221" @default.
- W3037291232 abstract "ABSTRACT We investigate the impact of cosmic rays (CRs) on the circumgalactic medium (CGM) in FIRE-2 simulations, for ultra-faint dwarf through Milky Way (MW)-mass haloes hosting star-forming (SF) galaxies. Our CR treatment includes injection by supernovae, anisotropic streaming and diffusion along magnetic field lines, and collisional and streaming losses, with constant parallel diffusivity $kappa sim 3times 10^{29}, mathrm{cm^2 s^{-1}}$ chosen to match γ-ray observations. With this, CRs become more important at larger halo masses and lower redshifts, and dominate the pressure in the CGM in MW-mass haloes at z ≲ 1–2. The gas in these ‘CR-dominated’ haloes differs significantly from runs without CRs: the gas is primarily cool (a few ${sim}10^{4},$ K), and the cool phase is volume-filling and has a thermal pressure below that needed for virial or local thermal pressure balance. Ionization of the ‘low’ and ‘mid’ ions in this diffuse cool gas is dominated by photoionization, with O vi columns ${gtrsim}10^{14.5}, mathrm{cm^{-2}}$ at distances ${gtrsim}150, mathrm{kpc}$. CR and thermal gas pressure are locally anticorrelated, maintaining total pressure balance, and the CGM gas density profile is determined by the balance of CR pressure gradients and gravity. Neglecting CRs, the same haloes are primarily warm/hot ($Tgtrsim 10^{5},$K) with thermal pressure balancing gravity, collisional ionization dominates, O vi columns are lower and Ne viii higher, and the cool phase is confined to dense filaments in local thermal pressure equilibrium with the hot phase." @default.
- W3037291232 created "2020-07-02" @default.
- W3037291232 creator A5000130235 @default.
- W3037291232 creator A5013583777 @default.
- W3037291232 creator A5026079145 @default.
- W3037291232 creator A5038938655 @default.
- W3037291232 creator A5053323835 @default.
- W3037291232 creator A5075959544 @default.
- W3037291232 creator A5079016405 @default.
- W3037291232 creator A5079098548 @default.
- W3037291232 creator A5083397483 @default.
- W3037291232 date "2020-06-26" @default.
- W3037291232 modified "2023-10-18" @default.
- W3037291232 title "Properties of the circumgalactic medium in cosmic ray-dominated galaxy haloes" @default.
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