Astronomy & Astrophysics

Free access article

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 Pino²

¹ 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 $\approx$ 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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