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    A Model for Clumpy Self-enrichment in Globular Clusters

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    Bailin_2018_ApJ_863_99.pdf
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    Author
    Bailin, Jeremy
    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2018-08-10
    Keywords
    globular clusters: general
    nuclear reactions, nucleosynthesis, abundances
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    Jeremy Bailin 2018 ApJ 863 99
    Journal
    ASTROPHYSICAL JOURNAL
    Rights
    © 2018. The American Astronomical Society. All rights reserved.
    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
    Detailed observations of globular clusters (GCs) have revealed evidence of self-enrichment: some of the heavy elements that we see in stars today were produced by cluster stars themselves. Moreover, GCs have internal subpopulations with different elemental abundances, including, in some cases, in elements such as iron that are produced by supernovae. This paper presents a theoretical model for GC formation motivated by observations of Milky Way star-forming regions and simulations of star formation, where giant molecular clouds fragment into multiple clumps that undergo star formation at slightly different times. Core collapse supernovae from earlier-forming clumps can enrich later-forming clumps to the degree that the ejecta can be retained within the gravitational potential well, resulting in subpopulations with different total metallicities once the clumps merge to form the final cluster. The model matches the mass-metallicity relation seen in GC populations around massive elliptical galaxies, and predicts metallicity spreads within clusters in excellent agreement with those seen in Milky Way GCs, even for those whose internal abundance spreads are so large that their entire identity as a GC is in question. The internal metallicity spread serves as an excellent measurement of how much self-enrichment has occurred in a cluster, a result that is very robust to variation in the model parameters.
    ISSN
    1538-4357
    DOI
    10.3847/1538-4357/aad178
    Version
    Final published version
    Sponsors
    NASA [HST-AR-13908.001-A, NAS 5-26555]
    Additional Links
    http://stacks.iop.org/0004-637X/863/i=1/a=99?key=crossref.4dd48aac04a56793c87fe67c393bcb93
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-4357/aad178
    Scopus Count
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    UA Faculty Publications

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