Journal article
MODELING OF THE HERMES SUBMILLIMETER SOURCE LENSED BY A DARK MATTER DOMINATED FOREGROUND GROUP OF GALAXIES
The Astrophysical journal, Vol.738(2), 125
2011
DOI: 10.1088/0004-637X/738/2/125
Abstract
We present the results of a gravitational lensing analysis of the bright zs = 2.957 submillimeter galaxy (SMG) HERMES found in the Herschel/SPIRE science demonstration phase data from the Herschel Multi-tiered Extragalactic Survey (HerMES) project. The high-resolution imaging available in optical and near-IR channels, along with CO emission obtained with the Plateau de Bure Interferometer, allows us to precisely estimate the intrinsic source extension and hence estimate the total lensing magnification to be μ = 10.9 ± 0.7. We measure the half-light radius Reff of the source in the rest-frame near-UV and V bands that characterize the unobscured light coming from stars and find Reff, * = [2.0 ± 0.1] kpc, in good agreement with recent studies on the SMG population. This lens model is also used to estimate the size of the gas distribution (Reff, gas = [1.1 ± 0.5] kpc) by mapping back in the source plane the CO (J = 5 → 4) transition line emission. The lens modeling yields a relatively large Einstein radius REin = 4farcs10 ± 0farcs02, corresponding to a deflector velocity dispersion of [483 ± 16] km s−1. This shows that HERMES is lensed by a galaxy group-size dark matter halo at redshift zl ∼ 0.6. The projected dark matter contribution largely dominates the mass budget within the Einstein radius with fdm(< REin) ∼ 80%. This fraction reduces to fdm(< Reff, G1 ≃ 4.5 kpc) ∼ 47% within the effective radius of the main deflecting galaxy of stellar mass M*, G1 = [8.5 ± 1.6] × 1011 M☉. At this smaller scale the dark matter fraction is consistent with results already found for massive lensing ellipticals at z ∼ 0.2 from the Sloan Lens ACS Survey.
Details
- Title: Subtitle
- MODELING OF THE HERMES SUBMILLIMETER SOURCE LENSED BY A DARK MATTER DOMINATED FOREGROUND GROUP OF GALAXIES
- Creators
- R Gavazzi - Institut d'Astrophysique de ParisA Cooray - University of California, IrvineC. M Bradford - California Institute of TechnologyC Bridge - California Institute of TechnologyD Brisbin - Cornell UniversityD Burgarella - Aix-Marseille UniversitéP Chanial - Université Paris DiderotE Chapin - University of British ColumbiaN Christopher - University of OxfordD. L Clements - Imperial College LondonP Cox - Institut de RadioAstronomie Millimétrique, Domaine Universitaire, 38406 Saint Martin d'Hères, FranceS. G Diorgovski - Astronomy Department, California Institute of Technology, Pasadena, CA 91 125, United StatesA Conley - University of Colorado BoulderC. D Dowell - California Institute of TechnologyS Eales - Cardiff UniversityL Earle - University of Colorado BoulderT. P ELLSWORTH-BOWERS - University of Colorado BoulderD Farrah - University of SussexA Franceschini - University of PaduaH FU - California Institute of TechnologyJ Glenn - University of Colorado BoulderE. A GONZALEZ SOLARES - Institut d'Astrophysique de ParisM Griffin - Cardiff UniversityJ. E Aguirre - University of PennsylvaniaM. A Gurwell - Harvard UniversityM Halpern - University of British ColumbiaE Ibar - UK Astronomy Technology CentreR. J Iyison - Institut d'Astrophysique de ParisM Jarvis - University of HertfordshireJ Kamenetzky - University of Colorado BoulderS Kim - University of California, IrvineM Krips - Institut de RadioAstronomie Millimétrique, Domaine Universitaire, 38406 Saint Martin d'Hères, FranceL Leyenson - Jet Propulsion Laboratory, Pasadena, CA 91109, United StatesR Lupu - University of PennsylvaniaA Amblard - Ames Research CenterA Mahabal - California Institute of TechnologyP. D Maloney - University of Colorado BoulderC Maraston - University of PortsmouthL Marchetti - University of PaduaG Marsden - University of British ColumbiaH Matsuhara - Japan Aerospace Exploration AgencyA. M. J Mortier - Imperial College LondonE Murphy - California Institute of TechnologyB. J Naylor - Jet Propulsion LaboratoryR Neri - Institut de RadioAstronomie Millimétrique, Domaine Universitaire, 38406 Saint Martin d'Hères, FranceR Auld - Cardiff UniversityH. T Nguyen - California Institute of TechnologyS. J Oliver - University of SussexA Omont - Institut d'Astrophysique de ParisM. J Page - University College LondonA Papageorgiou - Cardiff UniversityC. P Pearson - University of LethbridgeI PEREZ-FOURNON - Institut d'Astrophysique de ParisM Pohlen - Cardiff UniversityN Rangwala - University of Colorado BoulderJ. I Rawlings - University College LondonA Beelen - Université Paris-SudA Blain - California Institute of TechnologyR Blundell - Harvard UniversityJ Bock - California Institute of Technology
- Resource Type
- Journal article
- Publication Details
- The Astrophysical journal, Vol.738(2), 125
- DOI
- 10.1088/0004-637X/738/2/125
- ISSN
- 0004-637X
- eISSN
- 1538-4357
- Publisher
- Institute of Physics (IOP)
- Language
- English
- Date published
- 2011
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984199746702771
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