Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 371, Issue 1, Pages 444-450Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2006.10689.x
Keywords
stars : formation; stars : general; stars : magnetic fields; galaxies : formation; cosmology : theory
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We argue that the first stars may have spanned the conventional mass range rather than be identified with the very massive objects (similar to 100-10(3) M-circle dot) favoured by numerical simulations. Specifically, we find that magnetic field generation processes acting in the first protostellar systems suffice to produce fields that exceed the threshold for magneto-rotational instability (MRI) to operate, and thereby allow the MRI dynamo to generate equipartition-amplitude magnetic fields on protostellar mass scales below similar to 50 M-circle dot. Such fields allow primordial star formation to occur at essentially any metallicity by regulating angular momentum transfer, fragmentation, accretion and feedback in much the same way as occurs in conventional molecular clouds.
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