Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.252..378s&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 252, Oct. 1, 1991, p. 378-385. Research supported by SE
Astronomy and Astrophysics
Astronomy
49
Astronomical Maps, Bow Waves, Herbig-Haro Objects, Hydrogen Clouds, Molecular Clouds, Early Stars, Infrared Imagery, Shock Waves
Scientific paper
The H2 emission-line maps are simulated with a model in which the H2 emission is generated from a cool C-shock region in the oblique tail of a bow shock. It is shown that low-speed bows produce arcs and limb-brightened structures of conical appearance. High-speed bows yield more diffuse tailed regions with blunter leading edges. The v = 2-1 S(1) distribution is more compact than that from v = 1-0 S(1). The location, the compactness, and the identifying features also depend strongly on the orientation. For high-speed bows, the H2 peak appears ahead of the bow apex for motions close to the line-of-sight but is well behind the apex when the motion is in the plane of the sky. The magnetic field direction is especially important in low Alfven number flows, corresponding to the high-field 'shock-absorber' model. A wide range of structures including distinct asymmetries are predicted. An initial comparison with observed bow structures is presented.
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