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A Toomre-like stabi...
A Toomre-like stability criterion for the clumpy and turbulent interstellar medium
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- Romeo, Alessandro, 1961 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Burkert, A. (författare)
- Ludwig-Maximilians-Universität München,Ludwig Maximilian University of Munich
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- Agertz, O. (författare)
- Universität Zürich,University of Zürich
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(creator_code:org_t)
- 2010-06-14
- 2010
- Engelska.
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Ingår i: Monthly Notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 407:2, s. 1223-1230
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Abstract
Ämnesord
Stäng
- 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, Graphic, 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.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
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- ref (ämneskategori)
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