Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008asthe.101...73t&link_type=abstract
The Astronomical Herald (ISSN 0374-2466), Vol. 101, No. 2, p. 73 - 82 (2008)
Astronomy and Astrophysics
Astronomy
1
Magnetic Fields, Star Formation
Scientific paper
The magnetic field plays an important role in various astronomical objects. In the star formation process, the magnetic fields are essential. In the force balance, the Lorentz force cannot be neglected, in which the magnetic flux to mass ratio controls the evolution of the cloud. In the star formation region, we find lots of outflows, which are regarded as the outcome of twisted magnetic field due to the rotation. The outflow is expected to appear just after a H2 (first) core is formed. Since the angular momentum of the gas is effectively transferred to the outflow, it solves the angular momentum problem in the star formation. The first core often fragments, if it has enough rotation rate. Since the magnetic field transfers the angular momentum from the core, it suppresses the fragmentation. The evolution of the first core is specified by the ratio of the angular rotation speed to the magnetic flux density. High-spatial resolution numerical simulations shown will bring us a new picture of star formation in the coming era of high-resolution observation driven by ALMA.
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