On the Density Distribution in Star-forming Interstellar Clouds

Abstract

We use deep adaptive mesh refinement simulations of isothermal self-gravitating supersonic turbulence to study the imprints of gravity on the mass density distribution in molecular clouds. The simulations show that the density distribution in self-gravitating clouds develops an extended power-law tail at high densities on top of the usual lognormal. We associate the origin of the tail with self-similar collapse solutions and predict the power index values in the range from -7/4 to -3/2 that agree with both simulations and observations of star-forming molecular clouds.

5 pages, 3 color figures; published version

References in corpus (21)

• A General Theory of Turbulence-Regulated Star Formation, From Spirals to ULIRGs
• The Stellar IMF from Turbulent Fragmentation
• The Statistics of Supersonic Isothermal Turbulence
• Analytical theory for the initial mass function: CO clumps and prestellar cores
• Structural Analysis of Molecular Clouds: Dendrograms
• Probing the evolution of molecular cloud structure: From quiescence to birth
• A Super-Alfvenic Model of Dark Clouds
• Density probability distribution in one-dimensional polytropic gas dynamics
• One-Point Probability Distribution Functions of Supersonic Turbulent Flows in Self-Gravitating Media
• On the Density Probability Function of Galactic Gas. I. Numerical Simulations and the Significance of the Polytropic Index
• Towards simulating star formation in the interstellar medium
• Driven and Decaying Turbulence Simulations of Low-Mass Star Formation: From Clumps to Cores to Protostars
• On the origin of the HI holes in the interstellar medium of dwarf irregular galaxies
• A Solution to the Protostellar Accretion Problem
• The Nature of the Velocity Field in Molecular Clouds. I. The Non-Magnetic Case
• Adaptive Mesh Refinement for Supersonic Molecular Cloud Turbulence
• Turbulent Mixing in the Interstellar Medium -- an application for Lagrangian Tracer Particles
• Mass and Magnetic distributions in Self Gravitating Super Alfvenic Turbulence with AMR
• Numerical and semi-analytic core mass distributions in supersonic isothermal turbulence
• Enhanced Core Formation Rate in a Turbulent Cloud by Self-gravity
• Interstellar Turbulence and Star Formation

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