Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...420..237s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 420, no. 1, p. 237-246
Astronomy and Astrophysics
Astronomy
48
Interstellar Matter, Protostars, Radiant Cooling, Radio Jets (Astronomy), Computerized Simulation, Gas Dynamics, Three Dimensional Models, Time Dependence, Wave Propagation
Scientific paper
In the third of three papers, we present three-dimensional time-dependent numerical simulations of the propagation of protostellar jets into uniform and plane-stratified ambient media using a nonequilibrium treatment of optically thin radiative cooling. We find the evolution of the jet beam and cocoon is similar to the results of previous two-dimensional simulations, including the formation of a thin dense shell at the head of the jet. However, in three dimensions this shell undergoes significant nonaxisymmetric fragmentation to form discrete knots and filaments. Knots shed from the head of the jet propagate nearly ballistically into the ambient gas and can be characterized as 'interstellar bullets.' On the other hand, variations in the speed of advance of the Mach disk can cause knots formed in the cooling shell to become embedded in the jet beam, leading to 'shocked cloudlets.' When the jet propagates through an ambient medium with a lateral density gradient, the bow shock propagates more slowly in the direction of the highest densities as expected, leading to a distorted cocoon. However, we find the orientation of the bow shock at the tip of the jet is time variable as the dense shell fragments. Synthetic H alpha emission maps and position-velocity diagrams are presented for direct comparison to observations.
Norman Michael L.
Stone James M.
No associations
LandOfFree
Numerical simulations of protostellar jets with nonequilibrium cooling. 3: Three-dimensional results does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Numerical simulations of protostellar jets with nonequilibrium cooling. 3: Three-dimensional results, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Numerical simulations of protostellar jets with nonequilibrium cooling. 3: Three-dimensional results will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-865650