The structure of HI in galactic disks: Simulations vs observations

Abstract

We generate synthetic HI Galactic plane surveys from spiral galaxy simulations which include stellar feedback processes. Compared to a model without feedback we find an increased scale height of HI emission (in better agreement with observations) and more realistic spatial structure (including supernova blown bubbles). The synthetic data show HI self-absorption with a morphology similar to that seen in observations. The density and temperature of the material responsible for HI self-absorption is consistent with observationally determined values, and is found to be only weakly dependent on absorption strength and star formation efficiency.

12 pages, 7 figures. Accepted for publication in MNRAS

References in corpus (11)

• The present-day star formation rate of the Milky-Way determined from Spitzer detected young stellar objects
• Modeling CO Emission: I. CO as a Column Density Tracer and the X-Factor in Molecular Clouds
• The properties of the ISM in disc galaxies with stellar feedback
• Why are most molecular clouds not gravitationally bound?
• GMC formation by agglomeration and self gravity
• The ISM in spiral galaxies: can cooling in spiral shocks produce molecular clouds?
• Cloud and Star Formation in Disk Galaxy Models with Feedback
• Instabilities of Spiral Shocks -- II. A quasi-steady State in the multi-phase inhomogeneous ISM
• Galactic Spiral Shocks with Thermal Instability
• A Synthetic 21-cm Galactic Plane Survey of an SPH Galaxy Simulation
• Adaptive image ray-tracing for astrophysical simulations

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• Synthetic observations of star formation and the interstellar medium
• Synthetic CO, H2 and HI surveys of the Galactic 2nd Quadrant, and the properties of molecular gas
• Recovering interstellar gas properties with HI spectral lines: A comparison between synthetic spectra and 21-SPONGE
• On the accuracy of HI observations in molecular clouds -- More cold HI than thought?
• Giant molecular clouds: star factories of the galaxy
• Cloud and Star Formation in Spiral Arms
• Using synthetic emission maps to constrain the structure of the Milky Way