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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 358671.0, MPI für Astronomie / Publikationen_mpia
Combining strong and weak gravitational lensing in Abell 1689
Authors:Limousin, M.; Richard, J.; Jullo, E.; Kneib, J. P.; Fort, B.; Soucail, G.; Elíasdóttir, A.; Natarajan, P.; Ellis, R. S.; Smail, I.; Czoske, O.; Smith, G. P.; Hudelot, P.; Bardeau, S.; Ebeling, H.; Egami, E.; Knudsen, K. K.
Date of Publication (YYYY-MM-DD):2007
Title of Journal:The Astrophysical Journal
Volume:668
Start Page:643
End Page:666
Audience:Not Specified
Abstract / Description:We present a reconstruction of the mass distribution of galaxy cluster Abell 1689 at z = 0.18 using detected strong lensing features from deep HST/ACS observations and extensive ground based spectroscopy. Earlier analyses have reported up to 32 multiply imaged systems in this cluster, of which only 3 were spectroscopically confirmed. In this work, we present a parametric strong lensing mass reconstruction using 24 multiply imaged systems with newly determined spectroscopic redshifts, which is a major step forward in building a robust mass model. In turn, the new spectroscopic data allows a more secure identification of multiply imaged systems. The resultant mass model enables us to reliably predict the redshifts of additional multiply imaged systems for which no spectra are currently available, and to use the location of these systems to further constrain the mass model. In particular, we have detected 5 strong galaxy-galaxy lensing systems just outside the Einstein ring region, further constraining the mass profile. Our strong lensing mass model is consistent with that inferred from our large scale weak lensing analysis derived using CFH12k wide field images. Thanks to a new method for reliably selecting a well defined background lensed galaxy population, we resolve the discrepancy found between the strong and weak lensing mass models reported in earlier work. [ABRIDGED]
Free Keywords:Astrophysics
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://cdsads.u-strasbg.fr/abs/2006astro.ph.12165L
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