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A&A 426, L25-L28 (2004)
DOI: 10.1051/0004-6361:200400073
Letter
3-D numerical simulations of rotating jets
The case of the DG Tau microjet
A. H. Cerqueira1 and E. M. de Gouveia Dal Pino21 LATO-DCET-UESC, Rodovia Ilhéus - Itabuna, km 16, Ilhéus, Bahia, CEP 45662-260, Brazil
e-mail: hoth@uesc.br
2 IAG-USP, Rua do Matão, 1226, Cidade Universitária, São Paulo, São Paulo, CEP 01060-970, Brazil
e-mail: dalpino@astro.iag.usp.br
(Received 29 April 2004 / Accepted 6 September 2004)
Abstract
We here present results of three-dimensional Smoothed Particle hydro and
magnetohydrodynamics simulations of rotating jets, also including the
effects of radiative cooling, precession and velocity variability. Using
initial conditions and parameters which are particularly suitable for the
DG Tau microjet, we have been able to approximately reproduce its complex
knotty morphology and kinematics. We have also obtained radial velocity
maps which are in good agreement with the data obtained by Bacciotti et al.,
thus indicating that their interpretation that the DG Tau
microjet is rotating is correct. Finally, we have found that a magnetic
field of the order of
0.5 mG is sufficient to collimate the jet
against the lateral expansion that is caused by the centrifugal forces.
Key words: ISM: jets and outflows: Herbig-Haro objects -- stars: formation
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