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    The Faint End of the Centaurus A Satellite Luminosity Function

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    Crnojević_2019_ApJ_872_80.pdf
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    Author
    Crnojević, D.
    Sand, D. J.
    Bennet, P.
    Pasetto, S.
    Spekkens, K. cc
    Caldwell, N.
    Guhathakurta, P.
    McLeod, B.
    Seth, A.
    Simon, J. D.
    Strader, J. cc
    Toloba, E. cc
    Show allShow less
    Affiliation
    Univ Arizona, Steward Observ
    Univ Arizona, Dept Astron
    Issue Date
    2019-02-10
    Keywords
    galaxies: dwarf
    galaxies: evolution
    galaxies: groups: individual (Cen A)
    galaxies: halos
    galaxies: luminosity function, mass function
    galaxies: photometry
    
    Metadata
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    Publisher
    IOP PUBLISHING LTD
    Citation
    D. Crnojević et al 2019 ApJ 872 80
    Journal
    ASTROPHYSICAL JOURNAL
    Rights
    © 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
    The Panoramic Imaging Survey of Centaurus and Sculptor (PISCeS) is constructing a wide-field map of the resolved stellar populations in the extended halos of these two nearby, prominent galaxies. We present new Magellan/Megacam imaging of a similar to 3 deg(2) area around Centaurus A (Cen A), which filled in much of our coverage to its south, leaving a nearly complete halo map out to a projected radius of similar to 150 kpc and allowing us to identify two new resolved dwarf galaxies. We have additionally obtained deep Hubble Space Telescope (HST) optical imaging of 11 out of the 13 candidate dwarf galaxies identified around Cen A and presented in Crnojevic et al. 2016a: seven are confirmed to be satellites of Cen A, while four are found to be background galaxies. We derive accurate distances, structural parameters, luminosities, and photometric metallicities for the seven candidates confirmed by our HST/ACS imaging. We further study the stellar population along the similar to 60 kpc long (in projection) stream associated with Dw3, which likely had an initial brightness of M-V similar to -15 and shows evidence for a metallicity gradient along its length. Using the total sample of 11 dwarf satellites discovered by the PISCeS survey, as well as 13 brighter previously known satellites of Cen A, we present a revised galaxy luminosity function for the Cen A group down to a limiting magnitude of M-V similar to -8, which has a slope of -1.14 +/- 0.17, comparable to that seen in the Local Group and in other nearby groups of galaxies.
    ISSN
    1538-4357
    DOI
    10.3847/1538-4357/aafbe7
    Version
    Final published version
    Sponsors
    NASA from the Space Telescope Science Institute [NNX14AF84G, HST-GO-13856.001]; NSF [AST-1514763, AST-1814208, AST-1821967, AST-1821987, AST-1813708, AST-1813466, AST-1010039, AST-1412504, AST-1412792]; Packard Fellowship; Natural Sciences and Engineering Research Council of Canada (NSERC); National Science Foundation [PHYS-1066293]; Aspen Center for Physics; Smithsonian Astrophysical Observatory; NASA [NNX14AF84G, NAS 5-26555]
    Additional Links
    http://stacks.iop.org/0004-637X/872/i=1/a=80?key=crossref.ee71687c6486f768c1653583d2bfb604
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-4357/aafbe7
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