Effects of the Magnetic Field on the H Emission from Jets: Special Issue: VIRTUAL astrophysical jets

Authors: de Colle, Fabio¹; Raga, Alejandro²

Source: Astrophysics and Space Science, Volume 293, Number 1, 2004 , pp. 173-180(8)

Publisher: Springer

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Abstract:

We present results of MHD axisymmetrical cylindrical simulations performed to study H alpha

emission maps from jets, with a toroidal field geometry for the magnetic field. Our code uses a linear Riemann solver, integrates equations in 2.5 dimensions and includes the calculation of the ionization fraction and the effects of the emission due to the collisional excitation of [O I] and [O II] lines, radiative recombination of H and the collisional ionization of H and excitation of Lyman- alpha

. The simulations with variable ejection velocities show that the magnetic field produces an increase in the emission from all of the knots except for the first bow shock.

Keywords: ISM:; jets and outflows; MHD; methods:; numerical; Herbig-Haro objects

Document Type: Research article

DOI: http://dx.doi.org/10.1023/B:ASTR.0000044665.56845.48

Affiliations: 1: Instituto de Astronomía, UNAM, Ap. 70-264, D.F., México., Email: fdecolle@astroscu.unam.mx 2: Instituto de Ciencias Nucleares, UNAM, Ap. 70-543, D.F., México

Publication date: 2004-01-01