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Oscar Agertz. Profile photo.

Oscar Agertz

Assistant Professor / Associate senior university lecturer / Wallenberg Academy Fellow

Oscar Agertz. Profile photo.

A Toomre-like stability criterion for the clumpy and turbulent interstellar medium

Author

  • Alessandro B. Romeo
  • Andreas Burkert
  • Oscar Agertz

Summary, in English

We explore the gravitational instability of clumpy and turbulent gas discs, taking into account the Larson-type scaling laws observed in giant molecular clouds (GMCs) and H i, as well as more general scaling relations. This degree of freedom is of special interest in view of the coming high-z interstellar medium surveys and is thus potentially important for understanding the dynamical effects of turbulence at all epochs of galaxy evolution. Our analysis shows that turbulence has a deep impact on the gravitational instability of the disc. It excites a rich variety of stability regimes, several of which have no classical counterpart. Among other diagnostics, we provide two useful tools for observers and simulators: (1) the stability map of turbulence, which illustrates our stability scenario and relates it to the phenomenology of interstellar turbulence: GMC/H i observations, simulations and models; (2) a Toomre-like stability criterion, , which applies to a large class of clumpy/turbulent discs. We make specific predictions about GMC and cold-H i turbulence and point out the implications of our analysis for high-z galaxy surveys.

Publishing year

2010-09-01

Language

English

Pages

1223-1230

Publication/Series

Monthly Notices of the Royal Astronomical Society

Volume

407

Issue

2

Document type

Journal article

Publisher

Oxford University Press

Keywords

  • Galaxies: ISM
  • Instabilities
  • ISM: general
  • ISM: kinematics and dynamics
  • ISM: structure
  • Turbulence

Status

Published

ISBN/ISSN/Other

  • ISSN: 0035-8711