Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992natur.355..524i&link_type=abstract
Nature (ISSN 0028-0836), vol. 355, Feb. 6, 1992, p. 524-526. Research supported by NSF and Netherlands Organisation for Research
Astronomy and Astrophysics
Astronomy
56
Interstellar Gas, Jet Flow, Molecular Clouds, Planetary Nebulae, Active Galactic Nuclei, Herbig-Haro Objects, Hydrodynamic Equations, Stellar Winds, Two Dimensional Models
Scientific paper
Many astrophysical objects can be very simply modeled as isotropic sources of high-energy tenuous gas embedded in dense toroidal clouds. Numerical simulations are described here which show how such an arrangement can in general circumstances give rise to a well-collimated jet, as is observed in many of these systems. The model is a 2D generalization of the interacting-winds description of PNe. Where the two winds come into contact, a discontinuity is formed which is dragged out by the fast-outflowing gas into a chimney along the polar axis. High-energy gas rushes up this channel and flows out around the top, creating a hot backflow which keeps the chimney in place. The inner shock, enclosing the source of the fast wind, also aids in collimation, and ionization cones such as those observed in AGN may also form.
Balick Bruce
Eulderink Frits
Frank Adam
Icke Vincent
Mellema Garrelt
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