Journal Article

Effect of Population III multiplicity on dark star formation

Athena Stacy, Andreas H. Pawlik, Volker Bromm and Abraham Loeb

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 421, issue 1, pages 894-907
Published in print March 2012 | ISSN: 0035-8711
Published online March 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.20373.x
Effect of Population III multiplicity on dark star formation

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We numerically study the mutual interaction between dark matter (DM) and Population III (Pop III) stellar systems in order to explore the possibility of Pop III dark stars within this physical scenario. We perform a cosmological simulation, initialized at z∼ 100, which follows the evolution of gas and DM. We analyse the formation of the first minihalo at z∼ 20 and the subsequent collapse of the gas to densities of 1012 cm−3. We then use this simulation to initialize a set of smaller scale ‘cut-out’ simulations in which we further refine the DM to have spatial resolution similar to that of the gas. We test multiple DM density profiles, and we employ the sink particle method to represent the accreting star-forming region. We find that, for a range of DM configurations, the motion of the Pop III star–disc system serves to separate the positions of the protostars with respect to the DM density peak, such that there is insufficient DM to influence the formation and evolution of the protostars for more than ∼5000 years. In addition, the star–disc system causes gravitational scattering of the central DM to lower densities, further decreasing the influence of DM over time. Any DM-powered phase of Pop III stars will thus be very short-lived for the typical multiple system, and DM will not serve to significantly prolong the life of Pop III stars.

Keywords: stars: formation; stars: Population III; galaxies: formation; cosmology: theory; dark ages, reionization, first stars; early Universe

Journal Article.  11957 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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