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Title:
Inefficient star formation: the combined effects of magnetic fields and radiative feedback
Authors:
Price, Daniel J.; Bate, Matthew R.
Affiliation:
AA(Centre for Stellar and Planetary Astrophysics, School of Mathematical Sciences, Monash University, Clayton, Vic 3168, Australia; School of Physics, University of Exeter, Stocker Rd, Exeter EX4 4QL), AB(School of Physics, University of Exeter, Stocker Rd, Exeter EX4 4QL)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 398, Issue 1, pp. 33-46. (MNRAS Homepage)
Publication Date:
09/2009
Origin:
MNRAS
MNRAS Keywords:
magnetic fields , MHD , stars: formation , stars: low-mass, brown dwarfs , ISM: clouds , galaxies: star clusters
DOI:
10.1111/j.1365-2966.2009.14969.x
Bibliographic Code:
2009MNRAS.398...33P

Abstract

We investigate the effects of magnetic fields and radiative protostellar feedback on the star formation process using self-gravitating radiation magnetohydrodynamical calculations. We present results from a series of calculations of the collapse of 50Msolar molecular clouds with various magnetic field strengths and with and without radiative transfer. We find that both magnetic fields and radiation have a dramatic impact on star formation, though the two effects are in many ways complementary. Magnetic fields primarily provide support on large scales to low-density gas, whereas radiation is found to strongly suppress small-scale fragmentation by increasing the temperature in the high-density material near the protostars. With strong magnetic fields and radiative feedback, the net result is an inefficient star formation process with a star formation rate of <~10 per cent per free-fall time that approaches the observed rate, although we have only been able to follow the calculations for 1/3 of a free-fall time beyond the onset of star formation.
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