Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 398, Issue 1, Pages 33-46Publisher
WILEY-BLACKWELL PUBLISHING, INC
DOI: 10.1111/j.1365-2966.2009.14969.x
Keywords
magnetic fields; MHD; stars: formation; stars: low-mass; brown dwarfs; ISM: clouds; galaxies: star clusters
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Funding
- European Heads of Research Councils
- European Science Foundation EURYI (European Young Investigator) Awards scheme
- EC Sixth Framework Programme
- Science and Technology Facilities Council [PP/D508220/1, PP/C50707X/1] Funding Source: researchfish
- STFC [PP/D508220/1, PP/C50707X/1] Funding Source: UKRI
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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 50 M(circle dot) 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 less than or similar to 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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