Planck's dusty GEMS III. A massive lensing galaxy with a bottom-heavy stellar initial mass function at z=1.5
Author
Canameras, R.Nesvadba, N. P. H.
Kneissl, R.
Limousin, M.
Gavazzi, R.
Scott, D.

Dole, H.
Frye, B.
Koenig, S.
Le Floc'h, E.
Oteo, I.
Affiliation
Univ Arizona, Steward ObservIssue Date
2017-03-24Keywords
galaxies: high-redshiftgalaxies: evolution
galaxies: star formation
galaxies: stellar content
infrared: galaxies
submillimeter: galaxies
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EDP SCIENCES S ACitation
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 & AstrophysicsJournal
Astronomy & AstrophysicsRights
© 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
0004-63611432-0746
Version
Final published versionSponsors
CNRS; CNES; ERC program [321302]; COSMICISMAdditional Links
http://www.aanda.org/10.1051/0004-6361/201630359ae974a485f413a2113503eed53cd6c53
10.1051/0004-6361/201630359
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