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

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

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...444l.105m&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 444, no. 2, p. L105-L108

Astronomy and Astrophysics

Astrophysics

42

Density Distribution, Interstellar Magnetic Fields, Magnetohydrodynamic Waves, Mass To Light Ratios, Molecular Clouds, Spectral Line Width, Star Formation, Gravitation, Magnetohydrodynamics, Turbulence

Scientific paper

Large-amplitude, long-wavelength Alfven waves in self-gravitating, magnetically supported clouds imply a linewidth-size relation (Delta-nu)wave approximately = 1.4(B/30 micro-G)0.5(R/1 pc)0.5 km/s, 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 (Delta-nu)NT, the FWHM size R, and the field strength B have been measured.

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