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    Fragmentation In The First Galaxies

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    FragmentationFirstGalaxies.pdf (227.1Kb)
    Date
    2010-11
    Author
    Safranek-Shrader, C.
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    Abstract
    Using a one-zone model, we study the gravitational fragmentation of baryonic cold streams flowing into a typical first galaxy at high redshift to predict the expected fragmentation mass scale and thus a characteristic mass of the first population of stars to form by shock fragmentation. In this simplified model, we bypass the resolution barrier in simulations of progalaxy formation and directly probe the fragmentation mass scale of accreting gas streams. We find the fragmentation mass scale to be most strongly dependent on the metallicity of the gas and the background Lyman-Werner radiation field, and that either a large cluster of solar mass fragments or one large (10(5) M(circle dot)) fragment forms.
    Department
    Astronomy
    Subject
    astronomy & astrophysics
    physics, applied
    URI
    http://hdl.handle.net/2152/29463
    Citation
    Chalence Safranek‐Shrader. AIP Conference Proceedings 1294, 276 (Nov., 2010); doi: 10.1063/1.3518875
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