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    The role of non-ionizing radiation pressure in star formation: the stability of cores and filaments

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    MNRAS-2016-Seo-1088-99.pdf
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    Author
    Seo, Young Min
    Youdin, Andrew N.
    Affiliation
    Univ Arizona, Dept Astron
    Univ Arizona, Steward Observ
    Issue Date
    2016-09-01
    Keywords
    stars: formation
    ISM: clouds
    ISM: kinematics and dynamics
    
    Metadata
    Show full item record
    Publisher
    OXFORD UNIV PRESS
    Citation
    The role of non-ionizing radiation pressure in star formation: the stability of cores and filaments 2016, 461 (1):1088 Monthly Notices of the Royal Astronomical Society
    Journal
    Monthly Notices of the Royal Astronomical Society
    Rights
    © 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    Stars form when filaments and dense cores in molecular clouds fragment and collapse due to self-gravity. In the most basic analyses of gravitational stability, the competition between self-gravity and thermal pressure sets the critical (i.e. maximum stable) mass of spheres and the critical line density of cylinders. Previous work has considered additional support from magnetic fields and turbulence. Here, we consider the effects of non-ionizing radiation, specifically the inward radiation pressure force that acts on dense structures embedded in an isotropic radiation field. Using hydrostatic, isothermal models, we find that irradiation lowers the critical mass and line density for gravitational collapse, and can thus act as a trigger for star formation. For structures with moderate central densities, similar to 10(3) cm(-3), the interstellar radiation field in the Solar vicinity has an order unity effect on stability thresholds. For more evolved objects with higher central densities, a significant lowering of stability thresholds requires stronger irradiation, as can be found closer to the Galactic centre or near stellar associations. Even when strong sources of ionizing radiation are absent or extincted, our study shows that interstellar irradiation can significantly influence the star formation process.
    ISSN
    0035-8711
    1365-2966
    DOI
    10.1093/mnras/stw1385
    Version
    Final published version
    Additional Links
    http://mnras.oxfordjournals.org/lookup/doi/10.1093/mnras/stw1385
    ae974a485f413a2113503eed53cd6c53
    10.1093/mnras/stw1385
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