The angular momentum structure of cosmic ray driven galactic outflows triggered by stream accretion
arXiv:2109.12360 · doi:10.1093/mnras/stab2784
Abstract
We investigate the impact of gas accretion in streams on the evolution of disc galaxies, using magneto-hydrodynamic simulations including advection and anisotropic diffusion of cosmic rays generated by supernovae as the only source of feedback. Stream accretion has been suggested as an important galaxy growth mechanism in cosmological simulations and we vary their orientation and angular momentum in idealised setups. We find that accretion streams trigger the formation of galactic rings and enhanced star formation. The star formation rates and consequently the cosmic ray driven outflow rates are higher for low angular momentum accretion streams, which also result in more compact, lower angular momentum discs. The cosmic ray generated outflows show a characteristic structure. At low outflow velocities (< 50 km/s) the angular momentum distribution is similar to the disk and the gas is in a fountain flow. Gas at high outflow velocities (> 200 km/s), penetrating deep into the halo, has close to zero angular momentum, and originates from the centre of the galaxies. As the mass loading factors of the cosmic ray driven outflows are of order unity and higher, we conclude that this process is important for the removal of low angular momentum gas from evolving disk galaxies and the transport of, potentially metal enriched, material from galactic centres far into the galactic haloes.
arXiv comment14 pages, 18 figures, accepted for publication in MNRAS
References in corpus (45)
- Cold streams in early massive hot haloes as the main mode of galaxy formation
- Cosmic-ray propagation and interactions in the Galaxy
- Theoretical Challenges in Galaxy Formation
- From rings to bulges: evidence for rapid secular galaxy evolution at z~2 from integral field spectroscopy in the SINS survey
- The Formation of Disk Galaxies
- Four phases of angular-momentum buildup in high-z galaxies: from cosmic-web streams through an extended ring to disc and bulge
- The Milky Way's Kiloparsec Scale Wind: A Hybrid Cosmic-Ray and Thermally Driven Outflow
- Hierarchical formation of bulgeless galaxies: Why outflows have low angular momentum
- Galactic winds driven by cosmic-ray streaming
- Cosmic-ray Driven Outflows in Global Galaxy Disk Models
- Galactic Angular Momentum in the Illustris Simulation: Feedback and the Hubble Sequence
- Launching cosmic-ray-driven outflows from the magnetized interstellar medium
- Simulations of disk galaxies with cosmic ray driven galactic winds
- In-N-Out: the gas cycle from dwarfs to spiral galaxies
- But What About... Cosmic Rays, Magnetic Fields, Conduction, & Viscosity in Galaxy Formation
- Short-lived star-forming giant clumps in cosmological simulations of z~2 disks
- Global simulations of galactic winds including cosmic ray streaming
- Cosmic ray feedback in the FIRE simulations: constraining cosmic ray propagation with GeV gamma ray emission
- Cooler and smoother -- the impact of cosmic rays on the phase structure of galactic outflows
- Why stellar feedback promotes disc formation in simulated galaxies
- The role of cosmic ray pressure in accelerating galactic outflows
- Impact of Cosmic Ray Transport on Galactic Winds
- Cosmic rays can drive strong outflows from gas-rich high-redshift disk galaxies
- Cosmic ray-driven galactic winds: streaming or diffusion?
- The effects of cosmic rays on the formation of Milky Way-mass galaxies in a cosmological context
- Role of Cosmic Rays in the Circumgalactic Medium
- The dependence of cosmic ray driven galactic winds on halo mass
- Time-dependent galactic winds I. Structure and evolution of galactic outflows accompanied by cosmic ray acceleration
- A Primer on Eulerian Computational Fluid Dynamics for Astrophysics
- Galactic disk winds driven by cosmic ray pressure
- The Impact of Galactic Winds on the Angular Momentum of Disk Galaxies in the Illustris Simulation
- A Free, Fast, Simple and Efficient TVD MHD Code
- Cosmological simulations of galaxy formation with cosmic rays
- Origin of Star-Forming Rings around Massive Centres in Massive Galaxies at
- CHANG-ES XVI: An in-depth view of the cosmic-ray transport in the edge-on spiral galaxies NGC 891 and NGC 4565
- Simulations of cosmic ray propagation
- Implementation of CR Energy SPectrum (CRESP) algorithm in PIERNIK MHD code. I. Spectrally resolved propagation of CR electrons on Eulerian grids
- Conditions for fast magnetic reconnection in astrophysical plasmas
- PIERNIK mhd code - a multi-fluid, non-ideal extension of the relaxing-TVD scheme (I)
- PIERNIK mhd code - a multi-fluid, non-ideal extension of the relaxing-TVD scheme (II)
- Cosmic Ray Driven Outflows in an Ultraluminous Galaxy
- Time-dependent galactic winds
- PIERNIK mhd code - a multi-fluid, non-ideal extension of the relaxing-TVD scheme (III)
- PIERNIK mhd code - a multi-fluid, non-ideal extension of the relaxing-TVD scheme (IV)
- Galactic Outflows and the pollution of the Galactic Environment by Supernovae
Cited by in corpus (4)
- Why are thermally- and cosmic ray-driven galactic winds fundamentally different?
- The phase structure of cosmic ray driven outflows in stream fed disc galaxies
- The dynamical impact of cosmic rays in the Rhea magnetohydrodynamics simulations
- Spectrally resolved cosmic rays: II -- Momentum-dependent cosmic ray diffusion drives powerful galactic winds