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Radiation-driven implosion and triggered star formation

Bisbas, Thomas G., Wünsch, Richard, Whitworth, Anthony Peter, Hubber, David A. and Walch, Stefanie 2011. Radiation-driven implosion and triggered star formation. Astrophysical Journal 736 (2) , 142. 10.1088/0004-637X/736/2/142

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We present simulations of initially stable isothermal clouds exposed to ionizing radiation from a discrete external source, and identify the conditions that lead to radiatively driven implosion and star formation.We use the smoothed particle hydrodynamics code SEREN and a HEALPix-based photoionization algorithm to simulate the propagation of the ionizing radiation and the resulting dynamical evolution of the cloud. We find that the incident ionizing flux, ΦLyC, is the critical parameter determining the cloud evolution. At moderate fluxes, a large fraction of the cloud mass is converted into stars. As the flux is increased, the fraction of the cloud mass that is converted into stars and the mean masses of the individual stars both decrease. Very high fluxes simply disperse the cloud. Newly formed stars tend to be concentrated along the central axis of the cloud (i.e., the axis pointing in the direction of the incident flux). For given cloud parameters, the time, t�, at which star formation starts is proportional to Φ−1/3 LyC . The pattern of star formation found in the simulations is similar to that observed in bright-rimmed clouds

Item Type: Article
Date Type: Publication
Status: Published
Schools: Advanced Research Computing @ Cardiff (ARCCA)
Physics and Astronomy
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Uncontrolled Keywords: Hii regions ; hydrodynamics ; methods: numerical ; stars: formation Online-only material: color figures
Publisher: IOP Publishing
ISSN: 0004-637X
Last Modified: 04 Jun 2017 03:01

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