Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.6205y&link_type=abstract
American Astronomical Society, AAS Meeting #211, #62.05; Bulletin of the American Astronomical Society, Vol. 39, p.848
Other
Scientific paper
We present 3D hydrodynamic simulations of Herbig-Haro jets which yield a unique explanation of observed morphologies. Owing to their complex and dynamic nature, HH jet morphologies have yet to be fully accounted for. In particular, insight is being sought as to whether the heterogeneity of an HH object jet beam can be explained best by interactions of the jet with its environment or by the jet's launching mechanism. Both explanations have received extensive analytic and numerical attention. The present work ocuses on nonuniformity in the initial launching which permits the mbedding of dense ``clumps'' in an otherwise smooth jet beam. The clumps have variable size, velocity, and position within the jet beam. They are seen to have significant effects on the jet morphology, including the inducement of asymmetry in the jet head and the formation of discontinuities in the jet beam which might otherwise be explained by, say, working surfaces in a pulsed jet. Recent epochal HST images are especially relevant to our investigation for a variety of reasons. For example, in a typical jet-pulsation model, there is little reason to suspect large variations in the velocity dispersions and chemical composition of successive working surfaces. The present model provides a natural explanation for such variations perpendicular to the jet beam at a ``knot'' and allows a unique momentum transport mechanism relevant to overall jet morphologies. This work is supported by the Laboratory for Laser Energetics at the University of Rochester.
Cunningham Andrew
Frank Alejandro
Yirak Kristopher
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