Formation Criteria and the Mass of Secondary Population III Stars
arXiv:0907.1969 · doi:10.1088/0004-637X/702/1/480
Abstract
We explore the formation of secondary Population III (Pop III) stars under radiation hydrodynamic (RHD) feedback by a preformed massive star. To properly treat RHD feedback, we perform three-dimensional RHD simulations incorporating the radiative transfer of ionizing photons as well as H_2 dissociating photons from a preformed star. A collapsing gas cloud is settled at a given distance from a 120Msun Pop III star, and the evolution of the cloud is pursued including RHD feedback. We derive the threshold density depending on the distance, above which the cloud can keep collapsing owing to the shielding of H_2 dissociating radiation. We find that an H_2 shell formed ahead of an ionizing front works effectively to shield the H_2 dissociating radiation, leading to the positive feedback for the secondary Pop III star formation. Also, near the threshold density, the envelope of gas cloud is stripped significantly by a shock associated with an ionizing front. By comparing the mass accretion timescale with the Kelvin-Helmholtz timescale, we estimate the mass of secondary Pop III stars. It turns out that the stripping by a shock can reduce the mass of secondary Pop III stars down to \approx 20Msum.
ApJ accepted, 11 pages, 11 figures
References in corpus (14)
- Uncertainties in H2 and HD Chemistry and Cooling and their Role in Early Structure Formation
- Population III stars: hidden or disappeared ?
- Population III star formation in a Lambda CDM universe, I: The effect of formation redshift and environment on protostellar accretion rate
- Cosmological Radiative Transfer Codes Comparison Project I: The Static Density Field Tests
- Two populations of metal-free stars in the early Universe
- Occurrence of Metal-free Galaxies in the Early Universe
- Formation of Massive Primordial Stars in a Reionized Gas
- Does Radiative Feedback by the First Stars Promote or Prevent Second Generation Star Formation?
- How the First Stars Regulated Local Star Formation I: Radiative Feedback
- Ionization Front Instabilities in Primordial H II Regions
- Secondary Star Formation in a Population III Object
- Radiative transfer in decomposed domains
- Photodissociation feedback of Population III stars \\on their neighbor prestellar cores
- Radiative Regulation of Population III Star Formation
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