TY - JOUR
T1 - Full lensing analysis of Abell 1703
T2 - Comparison of independent lens-modelling techniques
AU - Zitrin, Adi
AU - Broadhurst, Tom
AU - Umetsu, Keiichi
AU - Rephaeli, Yoel
AU - Medezinski, Elinor
AU - Bradley, Larry
AU - Jiménez-Teja, Yolanda
AU - Benítez, Narciso
AU - Ford, Holland
AU - Liesenborgs, Jori
AU - De Rijcke, Sven
AU - Dejonghe, Herwig
AU - Bekaert, Philippe
PY - 2010/11
Y1 - 2010/11
N2 - The inner mass profile of the relaxed cluster Abell 1703 is analysed by two very different strong-lensing techniques applied to the deep Advanced Camera for Surveys and the Wide Field Channel 3 imaging. Our parametric method has the accuracy required to reproduce many sets of multiple images, based on the assumption that mass approximately traces light. We test this assumption with a fully non-parametric, adaptive grid method, with no knowledge of the galaxy distribution. Differences between the methods are seen on fine scales due to member galaxies which must be included in models designed to search for lensed images, but on the larger scale the general distribution of dark matter is in good agreement, with very similar radial mass profiles. We add undiluted weak-lensing measurements from deep multicolour Subaru imaging to obtain a fully model-independent mass profile out to the virial radius and beyond. Consistency is found in the region of overlap between the weak and strong lensing, and the full mass profile is well described by a Navarro, Frenk & White (NFW) model of a concentration parameter, cvir{reversed tilde} 7.15 ± 0.5 (and Mvir{reversed tilde} 1.22 ± 0.15 × 1015 M⊙ h-1). Abell 1703 lies above the standard c-M relation predicted for the standard Λ cold dark matter model, similar to other massive relaxed clusters with accurately determined lensing-based profiles.
AB - The inner mass profile of the relaxed cluster Abell 1703 is analysed by two very different strong-lensing techniques applied to the deep Advanced Camera for Surveys and the Wide Field Channel 3 imaging. Our parametric method has the accuracy required to reproduce many sets of multiple images, based on the assumption that mass approximately traces light. We test this assumption with a fully non-parametric, adaptive grid method, with no knowledge of the galaxy distribution. Differences between the methods are seen on fine scales due to member galaxies which must be included in models designed to search for lensed images, but on the larger scale the general distribution of dark matter is in good agreement, with very similar radial mass profiles. We add undiluted weak-lensing measurements from deep multicolour Subaru imaging to obtain a fully model-independent mass profile out to the virial radius and beyond. Consistency is found in the region of overlap between the weak and strong lensing, and the full mass profile is well described by a Navarro, Frenk & White (NFW) model of a concentration parameter, cvir{reversed tilde} 7.15 ± 0.5 (and Mvir{reversed tilde} 1.22 ± 0.15 × 1015 M⊙ h-1). Abell 1703 lies above the standard c-M relation predicted for the standard Λ cold dark matter model, similar to other massive relaxed clusters with accurately determined lensing-based profiles.
KW - Dark matter
KW - Galaxies: clusters: general
KW - Galaxies: clusters: individual: Abell 1703
KW - Galaxies: elliptical and lenticular, cD
KW - Galaxies: formation
KW - Gravitational lensing: strong
UR - http://www.scopus.com/inward/record.url?scp=77958529138&partnerID=8YFLogxK
U2 - 10.1111/j.1365-2966.2010.17258.x
DO - 10.1111/j.1365-2966.2010.17258.x
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AN - SCOPUS:77958529138
SN - 0035-8711
VL - 408
SP - 1916
EP - 1927
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 3
ER -