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    Clues to the nature of ultradiffuse galaxies from estimated galaxy velocity dispersions

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    Author
    Zaritsky, Dennis
    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2017-01-01
    Keywords
    galaxies: evolution
    galaxies: fundamental parameters
    galaxies: kinematics and dynamics
    
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    Show full item record
    Publisher
    OXFORD UNIV PRESS
    Citation
    Clues to the nature of ultradiffuse galaxies from estimated galaxy velocity dispersions 2017, 464 (1):L110 Monthly Notices of the Royal Astronomical Society: Letters
    Journal
    Monthly Notices of the Royal Astronomical Society: Letters
    Rights
    © 2016 The Author. 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
    We describe how to estimate the velocity dispersions of ultradiffuse galaxies (UDGs) using a previously defined galaxy scaling relationship. The method is accurate for the two UDGs with spectroscopically measured dispersions, as well as for ultracompact galaxies, ultrafaint galaxies, and stellar systems with little or no dark matter. This universality means that the relationship can be applied without further knowledge or prejudice regarding the structure of a galaxy. We then estimate the velocity dispersions of UDGs drawn from two published samples and examine the distribution of total masses. We find, in agreement with the previous studies of two individual UDGs, that these systems are dark matter dominated systems, and that they span a range of at least 10(10) < M-200/M-circle dot < 10(12). These galaxies are not, as an entire class, either all dwarfs or all failed L-* galaxies. Estimates of the velocity dispersions can also help identify interesting subsets of UDGs, such as those that are likely to have the largest mass-to-light ratios, for subsequent spectroscopic study.
    ISSN
    1745-3925
    1745-3933
    DOI
    10.1093/mnrasl/slw198
    Version
    Final published version
    Sponsors
    NSF [AST-1311326]; University of Arizona
    Additional Links
    https://academic.oup.com/mnrasl/article-lookup/doi/10.1093/mnrasl/slw198
    ae974a485f413a2113503eed53cd6c53
    10.1093/mnrasl/slw198
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