Scaling Relations for the Turbulent, Non--Self-gravitating, Neutral Component of the Interstellar Medium

Details Scaling Relations for the Turbulent, Non--Self-gravitating, Neutral Component of the Interstellar Medium Scaling Relations for the Turbulent, Non--Self-gravitating, Neutral Component of the Interstellar Medium

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...458..739f&link_type=abstract

Astrophysical Journal v.458, p.739

Astronomy and Astrophysics

Astronomy

62

Hydrodynamics, Ism: Clouds, Magnetohydrodynamics: Mhd, Turbulence

Scientific paper

Scaling relations for the turbulent, non-self-gravitating, neutral component of the interstellar medium (ISM) are derived on the basis of von Weizsäcker's phenomenological model of compressible turbulence. The turbulent velocity υ, column density N, gas density p, and mass M scale with region size l as υ ˜ N ˜ p-1 ˜ M1/5 ˜ l1/2. In addition, the spectral energy function E(k) ˜ k-2 for wavenumber k, and the diffuse cloud mass spectrum N(M) ˜ M-2. These derived relations are shown to be in good agreement with observations. The scaling of magnetic field strength in these regions is briefly discussed, but uncertainties involved with compressible MHD turbulence preclude any definite predictions. It appears that turbulent hydrodynamics is the common underlying physics which controls many of the properties of the neutral component of the ISM, independent of self-gravity.

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