Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990cajph..68..808p&link_type=abstract
Canadian Journal of Physics (ISSN 0008-4204), vol. 68, Sept. 1990, p. 808-822; Discussion, p. 822, 823. Research supported by NS
Astronomy and Astrophysics
Astrophysics
Interstellar Matter, Molecular Clouds, Star Formation, Astronomical Models, Interstellar Magnetic Fields, Magnetohydrodynamic Waves, Nuclear Astrophysics
Scientific paper
Star forming occurs in massive, dense, molecular clouds in the interstellar medium. These clouds have a rich substructure consisting of dense clumps and extended filaments. Since stars only form within these dense clumps, any fundamental theory of star formation must predict their physical properties. This review focusses on the physics of molecular clouds and discusses in this context a particular mechanism for the formation of structure that is well supported by the observations. Strong hydromagnetic waves are likely to be excited in molecular clouds since it is observed that cloud magnetic fields have energy densities close to gravity. These waves support the cloud against global gravitational collapse by providing an effective wave 'pressure'. This review also shows that waves may control the formation of structure in molecular clouds.
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