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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 660965.0, MPI für Astronomie / Publikationen_mpia
CLASH: New multiple images constraining the inner mass profile of MACS J1206.2-0847
Authors:Zitrin, A.; Rosati, P.; Nonino, M.; Grillo, C.; Postman, M.; Coe, D.; Seitz, S.; Eichner, T.; Broadhurst, T.; Jouvel, S.; Balestra, I.; Mercurio, A.; Scodeggio, M.; Benítez, N.; Bradley, L.; Ford, H.; Host, O.; Jimenez-Teja, Y.; Koekemoer, A.; Zheng, W.; Bartelmann, M.; Bouwens, R.; Czoske, O.; Donahue, M.; Graur, O.; Graves, G.; Infante, L.; Jha, S.; Kelson, D.; Lahav, O.; Lazkoz, R.; Lemze, D.; Lombardi, M.; Maoz, D.; McCully, C.; Medezinski, E.; Melchior, P.; Meneghetti, M.; Merten, J.; Molino, A.; Moustakas, L. A.; Ogaz, S.; Patel, B.; Regoes, E.; Riess, A.; Rodney, S.; Umetsu, K.; Van der Wel, A.
Date of Publication (YYYY-MM-DD):2012
Journal Abbrev.:The Astrophysical Journal
Volume:749
Issue / Number:2
Start Page:id. 97
Audience:Not Specified
Abstract / Description:We present a strong-lensing analysis of the galaxy cluster MACS J1206.2-0847 (z = 0.44) using UV, Optical, and IR, HST/ACS/WFC3 data taken as part of the CLASH multi-cycle treasury program, with VLT/VIMOS spectroscopy for some of the multiply lensed arcs. The CLASH observations, combined with our mass model, allow us to identify 47 new multiply lensed images of 12 distant sources. These images, along with the previously known arc, span the redshift range 1 <~ z <~ 5.5, and thus enable us to derive a detailed mass distribution and to accurately constrain, for the first time, the inner mass profile of this cluster. We find an inner profile slope of dlog Σ/dlog θ ~= -0.55 ± 0.1 (in the range [1'', 53''], or 5 kpc <~ r <~ 300 kpc), as commonly found for relaxed and well-concentrated clusters. Using the many systems uncovered here we derive credible critical curves and Einstein radii for different source redshifts. For a source at zs ~= 2.5, the critical curve encloses a large area with an effective Einstein radius of θ E = 28'' ± 3'', and a projected mass of (1.34 ± 0.15) × 1014 M &sun;. From the current understanding of structure formation in concordance cosmology, these values are relatively high for clusters at z ~ 0.5, so that detailed studies of the inner mass distribution of clusters such as MACS J1206.2-0847 can provide stringent tests of the ΛCDM paradigm.
Free Keywords:dark matter; galaxies: clusters: general; galaxies: clusters: individual: MACS J1206.2–0847; galaxies: high-redshift; gravitational lensing: strong
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://cdsads.u-strasbg.fr/abs/2012ApJ...749...97Z
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