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    A Tip of the Red Giant Branch Distance to the Dark Matter Deficient Galaxy NGC 1052-DF4 from Deep Hubble Space Telescope Data

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    Author
    Danieli, Shany
    van Dokkum, Pieter
    Abraham, Roberto
    Conroy, Charlie cc
    Dolphin, Andrew E. cc
    Romanowsky, Aaron J.
    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2020-05-15
    Keywords
    Dwarf galaxies
    Globular star clusters
    Distance measure
    HST photometry
    Galaxy dark matter halos
    Low surface brightness galaxies
    Red giant tip
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    Danieli, S., van Dokkum, P., Abraham, R., Conroy, C., Dolphin, A. E., & Romanowsky, A. J. (2020). A Tip of the Red Giant Branch Distance to the Dark Matter Deficient Galaxy NGC 1052-DF4 from Deep Hubble Space Telescope Data. The Astrophysical Journal Letters, 895(1), L4.
    Journal
    ASTROPHYSICAL JOURNAL LETTERS
    Rights
    © 2020. 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
    Previous studies have shown that the large, diffuse galaxies NGC 1052-DF2 and NGC 1052-DF4 both have populations of unusually luminous globular clusters as well as a very low dark matter content. Here we present newly obtained deep Hubble Space Telescope Advanced Camera for Surveys imaging of one of these galaxies, NGC 1052-DF4. We use these data to measure the distance of the galaxy from the location of the tip of the red giant branch (TRGB). We find a rapid increase in the number of detected stars fainter than m(F814W) similar to 27.3, which we identify as the onset of the red giant branch. Using a forward modeling approach that takes the photometric uncertainties into account, we find a TRGB magnitude of m(F814W,TRGB) = 27.47 +/- 0.16. The inferred distance, including the uncertainty in the absolute calibration, is D-TRGB = 20.0 +/- 1.6 Mpc. The TRGB distance of NGC 1052-DF4 is consistent with the previously determined surface brightness fluctuation distance of D-SBF = 18.7 +/- 1.7 Mpc to NGC 1052-DF2 and is consistent with the distance of the bright elliptical galaxy NGC 1052. We conclude that the unusual properties of these galaxies cannot be explained by distance errors.
    ISSN
    2041-8205
    EISSN
    2041-8213
    DOI
    10.3847/2041-8213/ab8dc4
    Version
    Final published version
    ae974a485f413a2113503eed53cd6c53
    10.3847/2041-8213/ab8dc4
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    UA Faculty Publications

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