Journal
ASTROPHYSICAL JOURNAL
Volume 738, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/738/2/125
Keywords
galaxies: elliptical and lenticular, cD; galaxies: groups: general; galaxies: halos; gravitational lensing: strong; submillimeter: galaxies
Categories
Funding
- Centre National de Etudes Spatiales
- SN [AST-0909182]
- Ajax Foundation
- CSA (Canada)
- NAOC (China)
- CEA
- CNES
- CNRS (France)
- ASI (Italy)
- MCINN (Spain)
- SNSB (Sweden)
- STFC (UK)
- NASA (USA)
- INSU/CNRS (France)
- MPG (Germany)
- IGN (Spain)
- W. M. Keck Foundation
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [909159] Funding Source: National Science Foundation
- STFC [ST/H004165/1, ST/I000976/1, ST/H001530/1, ST/H004157/1, ST/H004254/1, ST/I001204/1, ST/H001913/1, ST/F007019/1, ST/H00260X/1, PP/C002229/1, ST/G002630/1, ST/I005765/1] Funding Source: UKRI
- Science and Technology Facilities Council [PP/C002229/1, ST/H004157/1, ST/H004254/1, ST/G002630/1, ST/I005765/1, ST/I000976/1, ST/F007019/1, ST/I001204/1, ST/H00260X/1, ST/H001913/1, ST/H004165/1] Funding Source: researchfish
- UK Space Agency [ST/G003874/1, ST/H00002X/1, ST/F012373/1] Funding Source: researchfish
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We present the results of a gravitational lensing analysis of the bright z(s) = 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 mu = 10.9 +/- 0.7. We measure the half-light radius R-eff of the source in the rest-frame near-UV and V bands that characterize the unobscured light coming from stars and find R-eff,R-* = [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 (R-eff,R-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 R-Ein = 4 ''.10 +/- 0 ''.02, 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 z(l) similar to 0.6. The projected dark matter contribution largely dominates the mass budget within the Einstein radius with f(dm)(
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