The impact of stellar feedback on the density and velocity structure of the interstellar medium
arXiv:1608.08639 · doi:10.1093/mnras/stw3133
Abstract
We study the impact of stellar feedback in shaping the density and velocity structure of neutral hydrogen (HI) in disc galaxies. For our analysis, we carry out pc resolution -body+adaptive mesh refinement (AMR) hydrodynamic simulations of isolated galaxies, set up to mimic a Milky Way (MW), and a Large and Small Magellanic Cloud (LMC, SMC). We quantify the density and velocity structure of the interstellar medium using power spectra and compare the simulated galaxies to observed HI in local spiral galaxies from THINGS (The HI Nearby Galaxy Survey). Our models with stellar feedback give an excellent match to the observed THINGS HI density power spectra. We find that kinetic energy power spectra in feedback regulated galaxies, regardless of galaxy mass and size, show scalings in excellent agreement with super-sonic turbulence () on scales below the thickness of the HI layer. We show that feedback influences the gas density field, and drives gas turbulence, up to large (kpc) scales. This is in stark contrast to density fields generated by large scale gravity-only driven turbulence. We conclude that the neutral gas content of galaxies carries signatures of stellar feedback on all scales.
19 pages, 13 figures, 2 tables, accepted for publication in Monthly Notices of the Royal Astronomical Society
References in corpus (29)
- Theory of Star Formation
- Star Formation and Feedback in Smoothed Particle Hydrodynamic Simulations--I. Isolated Galaxies
- Slow Star Formation in Dense Gas: Evidence and Implications
- The Statistics of Supersonic Isothermal Turbulence
- Momentum Injection by Supernovae in the Interstellar Medium
- On the Star Formation Efficiency of Turbulent Magnetized Clouds
- What is Driving the HI Velocity Dispersion?
- Molecular Hydrogen and Global Star Formation Relations in Galaxies
- Turbulent Structure of a Stratified Supernova-Driven Interstellar Medium
- On the onset of galactic winds in quiescent star forming galaxies
- The Atomic to Molecular Transition in Galaxies. I: An Analytic Approximation for Photodissociation Fronts in Finite Clouds
- On the interplay between star formation and feedback in galaxy formation simulations
- Starbursts triggered by inter-galactic tides and interstellar compressive turbulence
- Modelling the supernova-driven ISM in different environments
- A simple multigrid scheme for solving the Poisson equation with arbitrary domain boundaries
- Large scale galactic turbulence: can self-gravity drive the observed HI velocity dispersions?
- The Power Spectrum of Supersonic Turbulence in Perseus
- Extended, regular HI structures around early-type galaxies
- Discreteness Effects in Lambda Cold Dark Matter Simulations: A Wavelet-Statistical View
- Larson's scaling laws, and the gravitational instability of clumpy discs at high redshift
- Characterizing gravitational instability in turbulent multi-component galactic discs
- Testing gravity with motion of satellites around galaxies: Newtonian gravity against Modified Newtonian Dynamics
- HI power spectrum of the spiral galaxy NGC628
- The effect of ISM turbulence on the gravitational instability of galactic discs
- Evolution of dust and molecular hydrogen in the Magellanic System
- Probing interstellar turbulence in spiral galaxies using HI power spectrum analysis
- Scaling Laws and Intermittency in Highly Compressible Turbulence
- The Role of Feedback in Shaping the Structure of the Interstellar Medium
- A ~ 12 kpc HI extension and other HI asymmetries in the isolated galaxy CIG 340 (IC 2487)
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- How primordial magnetic fields shrink galaxies
- A fundamental test for stellar feedback recipes in galaxy simulations
- The merger-starburst connection across cosmic times
- How runaway stars boost galactic outflows
- A diversity of starburst-triggering mechanisms in interacting galaxies and their signatures in CO emission
- Morphology and enhanced star formation in a Cartwheel-like ring galaxy
- On the Observed Diversity of Star Formation Efficiencies in Giant Molecular Clouds
- GASKAP-HI Pilot Survey Science I: ASKAP Zoom Observations of HI Emission in the Small Magellanic Cloud
- From giant clumps to clouds I: the impact of gas fraction evolution on the stability of galactic discs
- Magnetic field fluctuations in anisotropic, supersonic turbulence
- Supernovae feedback propagation: the role of turbulence
- Mapping Spatial Variations of HI Turbulent Properties in the Small and Large Magellanic Cloud
- Spatial Power Spectra of Dust across the Local Group: No Constraint on Disc Scale Height
- Spatial variations of turbulent properties of neutral hydrogen gas in the Small Magellanic Cloud using structure function analysis
- Universal gravity-driven isothermal turbulence cascade in disk galaxies
- A Search for correlations between turbulence and star formation in THINGS galaxies
- Dust Buried Compact Sources in the Dwarf Galaxy NGC 4449
- Physical Properties and Scaling Relations of Molecular Clouds: the Impact of Star Formation
- On the Viability of Determining Galaxy Properties from Observations I: Star Formation Rates and Kinematics
- HI column density statistics of the cold neutral medium from absorption studies
- Linking the Internal Properties of Infant Globular Clusters to their Formation Environments