The Radiative Transport of Dust in Primordial Galaxies and Second-Generation Star Formation

Abstract

We investigate the radiative transport of dust in primordial galaxies in the presence of the UV radiation field from the first metal-free stars. We find that dust created in the first supernova (SN) explosions can be driven through the interior of the SN remnant to accumulate in the SN shells, where second-generation stars may form from compressed cooling gas. This scenario requires metal-free stars to form continuously over timescales of up to 10 Myr, consistent with recent estimates. Silicate and graphite grains, as well as iron-bearing magnetites, are transported to the shells for reasonable parameter assumptions, but their relative yields from primordial SNe is an important factor in the resulting abundance ratios. We compare the results of segregated grain transport with the current nucleosynthetic data on extremely metal-poor Galactic halo stars. Fossil signatures of this process may already have been detected in those iron-poor stars with enhanced carbon and silicate elements such as magnesium, silicon and oxygen. We discuss the implications of our results for the transition from first- to second-generation star formation in primordial galaxies, and the role played by the radiative transport of dust in this process.

Accepted by ApJ; 10 ApJ-style pages, 5 figures. Minor revisions with added text, results and figures unchanged. Will appear in ApJ v. 640, 20 March 2006 issue

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• Thermal Emission from Warm Dust in the Most Distant Quasars
• Critical Metallicity and Fine-Structure Emission of Primordial Gas Enriched by the First Stars
• From First Stars to the Spite Plateau: a Possible Reconciliation of Halo Stars Observations with Predictions from Big Bang Nucleosynthesis
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• Spheroidal post-mergers in the local Universe
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• Evolution of the First Supernovae in Protogalaxies: Dynamics of Mixing of Heavy Elements
• Studying the first galaxies with ALMA
• Stellar population and dust extinction in an ultraluminous infrared galaxy at z=1.135
• A Cosmic Milestone: Constraints from Metal-Poor Halo Stars on the Cosmological Reionization Epoch
• Dust Distribution during Reionization
• Detecting the Transition From Pop III to Pop II Stars
• Radio studies of galaxy formation: Dense Gas History of the Universe