Hydromagnetic waves and the linewidth-size relation in interstellar molecular clouds

Telemachos Ch Mouschovias, Dimitrios Psatis

Research output: Contribution to journalArticlepeer-review


Large-amplitude, long-wavelength Alfvén waves in self-gravitating, magnetically supported clouds imply a linewidth-size relation (Δv)wave ≃ 1.4(B/30 μG)1/2(R/1 pc)1/2 km s-1, where B is the mean magnetic field strength and R the radius of the cloud. This relation is in excellent quantitative agreement with observations of objects (clouds, cores, and OH masers) for which the nonthermal linewidth (Δv)NT, the FWHM size R, and the field strength B have been measured.

Original languageEnglish (US)
Pages (from-to)L105-L108
JournalAstrophysical Journal
Issue number2 PART 2
StatePublished - May 10 1995


  • ISM: clouds
  • ISM: magnetic fields
  • ISM: molecules
  • MHD
  • Stars: formation waves

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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