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Article overview
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Conditions for the Formation of First-Star Binarie | Masahiro N. Machida
; Kazuyuki Omukai
; Tomoaki Matsumoto
; Shu-ichiro Inutsuka
; | Date: |
1 Nov 2007 | Abstract: | The fragmentation process of primordial-gas cores during prestellar collapse
is studied using three-dimensional nested-grid hydrodynamics. Starting from the
initial central number density of n sim10^3 cm^-3, we follow the evolution of
rotating spherical cores up to the stellar density n simeq 10^{22} cm^-3. An
initial condition of the cores is specified by three parameters: the ratios of
the rotation and thermal energies to the gravitational energy (eta_0, and
alpha_0, respectively), and the amplitude of the bar-mode density perturbation
(A_phi). Cores with rotation eta_0 > 10^{-6} are found to fragment during
the collapse. The fragmentation condition hardly depends on either the initial
thermal energy alpha_0 or amplitude of bar-mode perturbation A_phi. Since the
critical rotation parameter for fragmentation is lower than that expected in
the first star formation, binaries or multiples are also common for the first
stars. | Source: | arXiv, 0711.0069 | Services: | Forum | Review | PDF | Favorites |
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