Other
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.247..662a&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 247, Dec. 15, 1990, p. 662-673.
Other
45
Dark Matter, Galactic Evolution, Globular Clusters, Molecular Clouds, Star Formation, Baryons, Brown Dwarf Stars, Cosmology, Gravitational Collapse, Halos, Thermal Instability
Scientific paper
The Fall-Rees (1985) theory of globular cluster formation assumes that thermal instability in the collapsing gas of a protogalaxy gives rise to cool clouds embedded in a hot medium. These clouds, which have temperatures close to 10,000 K and Jeans masses around 10 to the 6th solar masses are identified as the precursors of globular clusters. In the present work, it is suggested that molecular hydrogen cools the clouds to temperatures around 100 K corresponding to Jeans masses of about 100 solar masses. It is further argued that these clouds form clusters of brown dwarfs, so that dark galactic haloes may be baryonic. The most massive clouds fragment into visible stars including globular clusters. These two modes of star formation may be a consequence of a pressure-dependent stellar initial mass function, as has been suggested in the context of cluster cooling flows, although other interpretations are also discussed.
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