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    Ultra-diffuse Galaxies at Ultraviolet Wavelengths

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    Singh_2019_AJ_157_212.pdf
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    Author
    Singh, Pranjal Rajendra
    Zaritsky, Dennis
    Donnerstein, Richard
    Spekkens, Kristine
    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2019-05-06
    Keywords
    galaxies: photometry
    galaxies: star formation
    
    Metadata
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    Publisher
    IOP PUBLISHING LTD
    Citation
    Pranjal Rajendra Singh et al 2019 AJ 157 212
    Journal
    ASTRONOMICAL JOURNAL
    Rights
    Copyright © 2019. 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
    We measure near-ultraviolet (NUV) aperture magnitudes from Galaxy Evolution Explorer images for 258 ultra-diffuse galaxy (UDG) candidates drawn from the initial Systematically Measuring Ultra-Diffuse Galaxies (SMUDGes) survey of similar to 300 square degrees surrounding, and including, the Coma galaxy cluster. For the vast majority, 242 of them, we present flux upper limits due either to a lack of significant flux in the aperture or confusion with other objects projected within the aperture. These limits often place interesting constraints on the UDG candidates, indicating that they are non-star-forming or quiescent. In particular, we identify field, quiescent UDG candidates, which are a challenge for formation models and are, therefore, compelling prospects for spectroscopic follow-up and distance determinations. We present far-ultraviolet (FUV) and NUV magnitudes for 16 detected UDG candidates and compare those galaxies to the local population of galaxies on color-magnitude and specific star formation rate diagrams. The NUV-detected UDG candidates form mostly an extension toward lower stellar masses of the star-forming galaxy sequence, and none of these lie within regions of high local galaxy density. UDG candidates span a range of properties, although almost all are consistent with being quiescent, low surface brightness galaxies, regardless of environment.
    ISSN
    0004-6256
    DOI
    10.3847/1538-3881/ab16f2
    Version
    Final published version
    Sponsors
    NASA [NAS5-26555]; National Science Foundation [NSF AAG-171384]
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-3881/ab16f2
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