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On the Density Distribution in Star-forming Interstellar Clouds

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arxiv 1007.2950 v3 pith:AGJBAQLY submitted 2010-07-17 astro-ph.GA

classification astro-ph.GA
keywords cloudsdensitydistributionsimulationsmolecularself-gravitatingstar-formingtail
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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.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. The $\sigma_s^2-\mathcal{M}$ relation in the multi-phase ISM: Exploring the density PDF with the Cloud Factory simulations

    astro-ph.GA 2026-07 conditional novelty 6.5 of 10

    The isothermal σ_s²–M relation fails for WNM/CNM and systematically overpredicts CO PDF widths, but tentatively holds for the log-normal portion of H2 in Cloud Factory multi-phase simulations.

  2. Sub-kpc scale gas density histograms of the nearby barred spiral galaxy M83: Multi-component molecular gas structure reflecting the galactic environment

    astro-ph.GA 2026-05 unverdicted novelty 5.0 of 10

    Molecular gas in M83 consists of two log-normal density components, with the high-density component enhanced along spiral arms and more tightly linked to star formation than the low-density component.

  3. Star Formation at the Periphery of a Molecular Superbubble: The Case of G12.79+0.43

    astro-ph.GA 2026-06 unverdicted novelty 3.0 of 10

    Observational study of G12.79+0.43 identifies YSOs and HII regions powered by B-type stars and associates the complex with the rim of a molecular superbubble of diameter ~50 pc and expansion age ~0.3 Myr without estab...

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