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http://hdl.handle.net/2289/1644| Title: | The radiative transport of dust in primordial galaxies and second-generation star formation |
| Authors: | Venkatesan, Aparna Nath, Biman B. Shull, J Michael |
| Keywords: | Cosmology: Theory ISM: Dust Extinction Galaxies: High-Redshift Stars: Abundances Stars: Population II ISM: Supernova Remnants |
| Issue Date: | 20-Mar-2006 |
| Publisher: | The University of Chicago Press for the American Astronomical Society |
| Citation: | Astrophysical Journal, 2006, Vol.640, p 31-40 |
| 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. |
| Description: | Restricted Access. Articles older than 2 years are open to all at the journal site (alternative location). Open access version available at arXiv.org |
| URI: | http://hdl.handle.net/2289/1644 |
| ISSN: | 0004-637X 1538-4357 (online) |
| Alternative Location: | http://adsabs.harvard.edu/cgi-bin/bib_query?2006ApJ...640...31V http://arxiv.org/abs/astro-ph/0508163 http://dx.doi.org/10.1086/500078 |
| Copyright: | (2006) by the American Astronomical Society. |
| Appears in Collections: | Research Papers (A&A) |
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| File | Description | Size | Format | |
|---|---|---|---|---|
| 2006 ApJ640p31.pdf Restricted Access | Restricted Access | 223.61 kB | Adobe PDF | View/Open Request a copy |
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