SPH simulations of clumps formation by dissipative collisions of molecular clouds - II. Magnetic case


Autoria(s): Marinho, E. P.; Andreazza, C. M.; Lepine, JR
Contribuinte(s)

Universidade Estadual Paulista (UNESP)

Data(s)

26/02/2014

20/05/2014

26/02/2014

20/05/2014

01/12/2001

Resumo

We performed computer simulations of interstellar cloud-cloud collisions using the three-dimensional smoothed particle magnetohydrodynamics method. In order to study the role of the magnetic field on the process of collision-triggered fragmentation, we focused our attention on head-on supersonic collisions between two identical spherical molecular-clouds. Two extreme configurations of the magnetic field were adopted: parallel and perpendicular to the initial clouds motion. The initial magnetic field strength was approximately 12.0 muG. In the parallel case, much more of the collision debris were retained in the shocking region than in the non-magnetic case where gas escaped freely throughout the symmetry plane. Differently from the non-magnetic case, eddy-like vortices were formed. The regions of highest vorticity and the the regions of highest density are offset. We found clumps formation only in the parallel case, however, they were larger, hotter and less dense than in the analogous non-magnetic case. In the perpendicular case, the compressed field works as a magnetic wall, preventing a stronger compression of the colliding clouds. This last effect inhibits direct contact of the two clouds. In both cases, we found that the field lines show a chaotic aspect in large scales. Also, the field magnitude is considerably amplified in the shock layer. However, the field distribution is almost coherent in the higher density regions.

Formato

1123-1137

Identificador

http://dx.doi.org/10.1051/0004-6361:20011352

Astronomy & Astrophysics. Les Ulis Cedex A: Edp Sciences S A, v. 379, n. 3, p. 1123-1137, 2001.

0004-6361

http://hdl.handle.net/11449/24799

10.1051/0004-6361:20011352

WOS:000172505100035

WOS000172505100035.pdf

Idioma(s)

eng

Publicador

Edp Sciences S A

Relação

Astronomy & Astrophysics

Direitos

closedAccess

Palavras-Chave #methods : numerical #MHD #ISM : clouds #ISM : molecules #ISM : magnetic field
Tipo

info:eu-repo/semantics/article