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    Planck's dusty GEMS III. A massive lensing galaxy with a bottom-heavy stellar initial mass function at z=1.5

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    Author
    Canameras, R.
    Nesvadba, N. P. H.
    Kneissl, R.
    Limousin, M.
    Gavazzi, R.
    Scott, D. cc
    Dole, H.
    Frye, B.
    Koenig, S.
    Le Floc'h, E.
    Oteo, I.
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    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2017-03-24
    Keywords
    galaxies: high-redshift
    galaxies: evolution
    galaxies: star formation
    galaxies: stellar content
    infrared: galaxies
    submillimeter: galaxies
    
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    Publisher
    EDP SCIENCES S A
    Citation
    Planck's dusty GEMS III. A massive lensing galaxy with a bottom-heavy stellar initial mass function at z=1.5 2017, 600:L3 Astronomy & Astrophysics
    Journal
    Astronomy & Astrophysics
    Rights
    © ESO, 2017.
    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 study the properties of the foreground galaxy of the Ruby, the brightest gravitationally lensed high-redshift galaxy on the sub-millimeter sky as probed by the Planck satellite, and part of our sample of Planck's dusty GEMS. The Ruby consists of an Einstein ring of 1.4" diameter at z = 3.005 observed with ALMA at 0.1" resolution, centered on a faint, red, massive lensing galaxy seen with HST/WFC3, which itself has an exceptionally high redshift, z = 1.525 +/- 0.001, as confirmed with VLT/X-shooter spectroscopy. Here we focus on the properties of the lens and the lensing model obtained with LENSTOOL. The rest-frame optical morphology of this system is strongly dominated by the lens, while the Ruby itself is highly obscured, and contributes less than 10% to the photometry out to the K band. The foreground galaxy has a lensing mass of (3.70 +/- 0.35) x 10(11) M-Theta Magnification factors are between 7 and 38 for individual clumps forming two image families along the Einstein ring. We present a decomposition of the foreground and background sources in the WFC3 images, and stellar population synthesis modeling with a range of star-formation histories for Chabrier and Salpeter initial mass functions (IMFs). Only the stellar mass range obtained with the latter agrees well with the lensing mass. This is consistent with the bottom-heavy IMFs of massive high-redshift galaxies expected from detailed studies of the stellar masses and mass profiles of their low-redshift descendants, and from models of turbulent gas fragmentation. This may be the first direct constraint on the IMF in a lens at z = 1.5, which is not a cluster central galaxy.
    Note
    Open access journal.
    ISSN
    0004-6361
    1432-0746
    DOI
    10.1051/0004-6361/201630359
    Version
    Final published version
    Sponsors
    CNRS; CNES; ERC program [321302]; COSMICISM
    Additional Links
    http://www.aanda.org/10.1051/0004-6361/201630359
    ae974a485f413a2113503eed53cd6c53
    10.1051/0004-6361/201630359
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