The Formation of Population III Binaries from Cosmological Initial Conditions

Details The Formation of Population III Binaries from Cosmological Initial Conditions The Formation of Population III Binaries from Cosmological Initial Conditions

2009-07-16

arxiv.org/abs/0907.2919v1

Science 9 July 2009: 1173540v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Accepted by Science, first published online on July 9, 2009 in Science Express. 16 pages, 4 figures, includes supporting onlin

Scientific paper

10.1126/science.1173540

Previous high resolution cosmological simulations predict the first stars to appear in the early universe to be very massive and to form in isolation. Here we discuss a cosmological simulation in which the central 50 solar mass clump breaks up into two cores, having a mass ratio of two to one, with one fragment collapsing to densities of 10^{-8} g/cc. The second fragment, at a distance of 800 astronomical units, is also optically thick to its own cooling radiation from molecular hydrogen lines, but is still able to cool via collision-induced emission. The two dense peaks will continue to accrete from the surrounding cold gas reservoir over a period of 10^5 years and will likely form a binary star system.

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