SIMBAD references

2008A&A...490L..39G - Astronomy and Astrophysics, volume 490, L39-42 (2008/11-2)

Modeling the magnetic field in the protostellar source NGC 1333 IRAS 4A.

GONCALVES J., GALLI D. and GIRART J.M.

Abstract (from CDS):

Magnetic fields are believed to play a crucial role in the process of star formation. We compare high-angular resolution observations of the submillimeter polarized emission of NGC 1333 IRAS 4A, tracing the magnetic field around a low-mass protostar, with models of the collapse of magnetized molecular cloud cores. Assuming a uniform dust alignment efficiency, we computed the Stokes parameters and synthetic polarization maps from the model density and magnetic field distribution by integrations along the line-of-sight and convolution with the interferometric response. The synthetic maps are in good agreement with the data. The best-fitting models were obtained for a protostellar mass of 0.8M, of age 9x104yr, formed in a cloud with an initial mass-to-flux ratio ∼2 times the critical value. The magnetic field morphology in NGC 1333 IRAS 4A is consistent with the standard theoretical scenario for the formation of solar-type stars, where well-ordered, large-scale, rather than turbulent, magnetic fields control the evolution and collapse of the molecular cloud cores from which stars form.

Abstract Copyright:

Journal keyword(s): ISM: magnetic fields - stars: formation - magnetohydrodynamics (MHD) - polarization

Simbad objects: 3

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