Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...437..517k&link_type=abstract
Astronomy and Astrophysics, Volume 437, Issue 2, July II 2005, pp.517-524
Astronomy and Astrophysics
Astrophysics
7
Hydrodynamics, Shock Waves, Ism: Jets And Outflows, Ism: Molecules
Scientific paper
We use numerical simulations to examine the mass-velocity, m(v), and intensity-velocity, I(v), relations in jet-driven molecular outflows up to an age of 2300 yr. We find that the m(v) relation is a power-law, m(v) ∝ v-γ, the exponent of which increases with time up to γ ≈ 1.6 at t ≈ 1500 yr. It then becomes roughly constant. This indicates that γ does not evolve throughout the lifetime of a molecular outflow, at least in the context of the jet-driven model. We also investigate the effect of long-period episodicity of the jet on the m(v) and I(v) relations. We find that, contrary to previous expectations, these relations are not significantly changed with the introduction of such variability into the jet. Finally, we present a novel, and relatively simple, parallelisation method for the code used in these simulations. This gives an increase of roughly a factor of 4 in speed over standard methods, and allows the simulations presented here to be run fairly easily, even with modest computational resources.
Downes Thomas Patrick
Keegan R.
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