On the Virial Theorem for Interstellar Medium

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An attempt has been made to derive a version of the virial integral that would describe average properties of the interstellar medium (ISM). It is suggested to eliminate the (large) contribution of stellar matter by introducing 'exclusion zones' surrounding stars. Such an approach leads to the appearance of several types of additional surface integrals in the general expression. Their contribution depends on the rate of energy and matter exchange between the stars and ISM. If this exchange is weak, one can obtain a desired virial integral for ISM. However, the presence of intermittent large-scale energetic events significantly constrains the applicability ... continued below

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Ryutov, D. September 24, 2007.

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An attempt has been made to derive a version of the virial integral that would describe average properties of the interstellar medium (ISM). It is suggested to eliminate the (large) contribution of stellar matter by introducing 'exclusion zones' surrounding stars. Such an approach leads to the appearance of several types of additional surface integrals in the general expression. Their contribution depends on the rate of energy and matter exchange between the stars and ISM. If this exchange is weak, one can obtain a desired virial integral for ISM. However, the presence of intermittent large-scale energetic events significantly constrains the applicability of the virial theorem. If valid, the derived virial integral is dominated by cold molecular/atomic clouds, with only minor contribution of the global magnetic field and low-density warm part.

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PDF-file: 16 pages; size: 1.2 Mbytes

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  • Journal Name: Astrophysical Journal, vol. 674, N/A, February 15, 2008, pp. 976; Journal Volume: 674

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  • Report No.: UCRL-JRNL-234933
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 941378
  • Archival Resource Key: ark:/67531/metadc900843

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  • September 24, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 9, 2016, 6:46 p.m.

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Ryutov, D. On the Virial Theorem for Interstellar Medium, article, September 24, 2007; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc900843/: accessed August 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.