Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.248..730s&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 248, Feb. 15, 1991, p. 730-740.
Astronomy and Astrophysics
Astronomy
63
H Lines, Molecular Flow, Shock Absorbers, Shock Wave Propagation, Star Formation, Interstellar Magnetic Fields, Magnetohydrodynamic Waves, Spectral Line Width, Stellar Mass
Scientific paper
A type of shock which accelerates hyhdrogen molecules to a high velocity without dissociating is investigated. Such soft C-shocks are characterized by low Alfven Mach numbers and low streaming speeds of the ions through the neutrals. Therefore, a shock in a region of high Alfven speed, v(A) can produce wide H2 line profiles. It is shown that the shape and width of the H2 line profiles in the OMC-1 outflow are reproduced by a bow shock of velocity 200-250 km/s moving through a dense medium with v(A) about 46 km/s. Line ratio data are also successfully modeled from which an H2O abundance of less than 0.0002 per hydrogen atom within the shock is inferred. It is asserted that regions with high Alfven speeds are associated with the most energetic bipolar outflows and are essential to the formation of high-mass stars.
Brand Peter W. J. L.
Moorhouse Alan
Smith Masson D.
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