Journal
ASTRONOMY & ASTROPHYSICS
Volume 449, Issue 3, Pages 1061-1066Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20053300
Keywords
magnetohydrodynamics (MHD); shock waves; methods : numerical; Herbig-Haro objects; ISM : jets and outflows; stars : winds, outflows
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We study the H alpha emission from jets using two-dimensional axisymmetrical simulations. We compare the emission obtained from hydrodynamic (HD) simulations with that obtained from magnetohydrodynamics (MHD) simulations. The magnetic field is supposed to be present in the jet only, and with a toroidal configuration. The simulations have time-dependent ejection velocities and different intensities for the initial magnetic field. The results show an increase in the H alpha emission along the jet for the magnetized cases with respect to the HD case. The increase in the emission is due to a better collimation of the jet in the MHD case, and to a small increase in the shock velocity. These results could have important implications for the interpretation of the observations of jets from young stellar objects.
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