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    Hubble Space Telescope Imaging of Antlia B: Star Formation History and a New Tip of the Red Giant Branch Distance

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    Author
    Hargis, J. R.
    Albers, S.
    Crnojević, D.
    Sand, D. J.
    Weisz, D. R.
    Carlin, J. L.
    Spekkens, K.
    Willman, B. cc
    Peter, A. H. G.
    Grillmair, C. J.
    Dolphin, A. E.
    Show allShow less
    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2020-01-03
    Keywords
    Dwarf galaxies
    Dwarf irregular galaxies
    Star formation
    Hubble Space Telescope
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    J. R. Hargis et al 2020 ApJ 888 31
    Journal
    ASTROPHYSICAL JOURNAL
    Rights
    Copyright © 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
    A census of the satellite population around dwarf galaxy primary hosts in environments outside the Local Group is essential to understanding ? cold dark matter galaxy formation and evolution on the smallest scales. We present deep optical Hubble Space Telescope imaging of the gas-rich, faint dwarf galaxy Antlia B (M-V = -9.4)-a likely satellite of NGC 3109 (D = 1.3 Mpc)-discovered as part of our ongoing survey of primary host galaxies similar to the Magellanic Clouds. We derive a new tip of the red giant branch distance of D = 1.35 0.06 Mpc (m - M = 25.65 0.10), consistent with membership in the nearby NGC 3109 dwarf association. The color-magnitude diagram (CMD) shows both a prominent old, metal-poor stellar component and confirms a small population of young, blue stars with ages less than or similar to 1 Gyr. We use the CMD fitting algorithm MATCH to derive the star formation history (SFH) and find that it is consistent with the typical dwarf irregular or transitional dwarf galaxy (dTrans) in the Local Group. Antlia B shows relatively constant stellar mass growth for the first similar to 10-11 Gyr and almost no growth in the last similar to 2-3 Gyr. Despite being gas-rich, Antlia B shows no evidence of active star formation (i.e., no H alpha emission) and should therefore be classified as a dTrans dwarf. Both Antlia B and the Antlia dwarf (dTrans) are likely satellites of NGC 3109, suggesting that the cessation of ongoing star formation in these galaxies may be environmentally driven. Future work studying the gas kinematics and distribution in Antlia B will explore this scenario in greater detail. Our work highlights the fact that detailed studies of nearby dwarf galaxies in a variety of environments may continue to shed light on the processes that drive the SFH and evolution of dwarf galaxies more generally.
    ISSN
    0004-637X
    DOI
    10.3847/1538-4357/ab58d2
    Version
    Final published version
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-4357/ab58d2
    Scopus Count
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    UA Faculty Publications

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