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Title: The thermal pressure distribution of a simulated cold neutral medium

We numerically study the thermal pressure distribution in a gas with thermal properties similar to those of the cold neutral interstellar gas by analyzing three-dimensional hydrodynamic models in boxes with sides of 100 pc with turbulent compressible forcing at 50 pc and different Mach numbers. We find that at high pressures and for large Mach numbers, both the volume-weighted and the density-weighted distributions can be appropriately described by a log-normal distribution, whereas for small Mach numbers they are better described by a power law. Thermal pressure distributions resulting from similar simulations but with self-gravity differ only for low Mach numbers; in this case, they develop a high pressure tail.
Authors:
 [1]
  1. Centro de Radioastronomía y Astrofísica, UNAM, A. P. 3-72, c.p. 58089 Morelia, Michoacán (Mexico)
Publication Date:
OSTI Identifier:
22356496
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 789; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COMPUTERIZED SIMULATION; DENSITY; DISTRIBUTION; GRAVITATION; HYDRODYNAMIC MODEL; HYDRODYNAMICS; INSTABILITY; MACH NUMBER; NUMERICAL ANALYSIS; THERMODYNAMIC PROPERTIES; THREE-DIMENSIONAL CALCULATIONS; TURBULENCE