Mathematics – Logic
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21713302s&link_type=abstract
American Astronomical Society, AAS Meeting #217, #133.02; Bulletin of the American Astronomical Society, Vol. 43, 2011
Mathematics
Logic
Scientific paper
We investigate the formation of metal-free, Population III, stars within a minihalo at z 20 with a smoothed particle hydrodynamics simulation,
starting from cosmological initial conditions. Employing a hierarchical, zoom-in procedure, we achieve sufficient numerical resolution to follow the collapsing gas in the center of the minihalo up to number densities of 1012 cm-3. We then study the protostellar accretion onto the initial hydrostatic core, which we represent as a growing sink particle. We continue our simulation for 5000 yearrs after the first sink particle has formed. During this time period, a disk-like configuration is assembled around the first protostar. At the end of the simulation, a small multiple system has formed, dominated by a binary with masses 40 Msol and 10 Msol. If Pop III stars were to form typically in binaries or small multiples, the standard model of primordial star formation, where single, isolated stars are predicted to form in minihalos, would have to be modified. As these sinks grow we furthermore measure the velocities and angular momenta of all particles that fall onto these protostellar regions. This allows us to determine the angular momentum of the sinks and estimate the rotational velocity of the Pop III stars expected to form within them. We find that there is sufficient angular momentum to yield rapidly rotating stars, with velocites close to break-up speed, providing a large enough spin to potentially lead to a GRB.
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