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• W3100284955 endingPage "187" @default.
• W3100284955 startingPage "187" @default.
• W3100284955 abstract "Radiation feedback from young star clusters embedded in giant molecular clouds (GMCs) is believed to be important to the control of star formation. For the most massive and dense clouds, including those in which super star clusters (SSCs) are born, pressure from reprocessed radiation exerted on dust grains may disperse a significant portion of the cloud mass back into the interstellar medium (ISM). Using our radiaton hydrodynamics (RHD) code, Hyperion, we conduct a series of numerical simulations to test this idea. Our models follow the evolution of self-gravitating, strongly turbulent clouds in which collapsing regions are replaced by radiating sink particles representing stellar clusters. We evaluate the dependence of the star formation efficiency (SFE) on the size and mass of the cloud and $kappa$, the opacity of the gas to infrared (IR) radiation. We find that the single most important parameter determining the evolutionary outcome is $kappa$, with $kappa gtrsim 15 text{ cm}^2 text{ g}^{-1}$ needed to disrupt clouds. For $kappa = 20-40 text{ cm}^2 text{ g}^{-1}$, the resulting SFE=50-70% is similar to empirical estimates for some SSC-forming clouds. The opacities required for GMC disruption likely apply only in dust-enriched environments. We find that the subgrid model approach of boosting the direct radiation force $L/c$ by a trapping factor equal to a cloud's mean IR optical depth can overestimate the true radiation force by factors of $sim 4-5$. We conclude that feedback from reprocessed IR radiation alone is unlikely to significantly reduce star formation within GMCs unless their dust abundances or cluster light-to-mass ratios are enhanced." @default.
• W3100284955 created "2020-11-23" @default.
• W3100284955 creator A5017189819 @default.
• W3100284955 creator A5060808906 @default.
• W3100284955 date "2015-08-21" @default.
• W3100284955 modified "2023-10-17" @default.
• W3100284955 title "NUMERICAL SIMULATIONS OF TURBULENT MOLECULAR CLOUDS REGULATED BY REPROCESSED RADIATION FEEDBACK FROM NASCENT SUPER STAR CLUSTERS" @default.
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• W3100284955 doi "https://doi.org/10.1088/0004-637x/809/2/187" @default.
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