Mathematics – Logic
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.9113s&link_type=abstract
American Astronomical Society, AAS Meeting #211, #91.13; Bulletin of the American Astronomical Society, Vol. 39, p.885
Mathematics
Logic
Scientific paper
We explore the implications of a possible cosmic ray (CR) background generated during the first supernova explosions that end the brief lives of massive Population III stars. We show that such a CR background could have significantly influenced the cooling and collapse of primordial gas clouds in minihaloes around redshifts of z 15 - 20, provided the CR flux was sufficient to yield an ionization rate greater than about 10-19 s-1 near the center of the minihalo. The presence of CRs with energies less than approximately 107 eV would indirectly enhance the molecular cooling in these regions, and we estimate that the resulting lower temperatures in these minihaloes would yield a characteristic stellar mass as low as 10 Msun. CRs have a less pronounced effect on the cooling and collapse of primordial gas clouds inside more massive dark matter haloes with virial masses greater than approximately 108 Msun at the later stages of cosmological structure formation around z 10 - 15. In these clouds, even without CR flux the molecular abundance is already sufficient to allow cooling to the floor set by the temperature of the cosmic microwave background.
Bromm Volker
Stacy Athena
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