| Lighting the universe with filaments. | |
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MedLine Citation:
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PMID: 17872439 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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The first stars in the universe form when chemically pristine gas heats as it falls into dark-matter potential wells, cools radiatively because of the formation of molecular hydrogen, and becomes self-gravitating. Using supercomputer simulations, we demonstrated that the stars' properties depend critically on the currently unknown nature of the dark matter. If the dark-matter particles have intrinsic velocities that wipe out small-scale structure, then the first stars form in filaments with lengths on the order of the free-streaming scale, which can be approximately 10(20) meters (approximately 3 kiloparsecs, corresponding to a baryonic mass of approximately 10(7) solar masses) for realistic "warm dark matter" candidates. Fragmentation of the filaments forms stars with a range of masses, which may explain the observed peculiar element abundance pattern of extremely metal-poor stars, whereas coalescence of fragments and stars during the filament's ultimate collapse may seed the supermassive black holes that lurk in the centers of most massive galaxies. |
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Authors:
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Liang Gao; Tom Theuns |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Science (New York, N.Y.) Volume: 317 ISSN: 1095-9203 ISO Abbreviation: Science Publication Date: 2007 Sep |
Date Detail:
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Created Date: 2007-09-17 Completed Date: 2007-10-01 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0404511 Medline TA: Science Country: United States |
Other Details:
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Languages: eng Pagination: 1527-30 Citation Subset: - |
Affiliation:
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Institute for Computational Cosmology, Durham University, South Road, Durham DH1 3LE, UK. liang.gao@durham.ac.uk |
Export Citation:
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| Comments/Corrections | |
Comment In:
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Science. 2007 Sep 14;317(5844):1511-2
[PMID:
17872435
]
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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