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

Telemachos Ch Mouschovias, Dimitrios Psatis

Research output: Contribution to journalArticle

Abstract

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)
JournalAstrophysical Journal
Volume444
Issue number2 PART 2
DOIs
StatePublished - May 10 1995

Fingerprint

magnetohydrodynamic waves
molecular clouds
field strength
masers
magnetic field
wavelength
radii
magnetic fields
wavelengths

Keywords

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

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Hydromagnetic waves and the linewidth-size relation in interstellar molecular clouds. / Mouschovias, Telemachos Ch; Psatis, Dimitrios.

In: Astrophysical Journal, Vol. 444, No. 2 PART 2, 10.05.1995.

Research output: Contribution to journalArticle

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abstract = "Large-amplitude, long-wavelength Alfv{\'e}n 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.",
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