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CLASH: New Multiple-Images Constraining the Inner Mass Profile of MACS J1206.2-0847 | | A. Zitrin
; P. Rosati
; M. Nonino
; C. Grillo
; M. Postman
; D. Coe
; S. Seitz
; T. Eichner
; T. Broadhurst
; S. Jouvel
; I. Balestra
; A. Mercurio
; M. Scodeggio
; N. Benítez
; L. Bradley
; H. Ford
; O. Host
; Y.Jimenez-Teja
; A. Koekemoer
; W. Zheng
; M. Bartelmann
; R. Bouwens
; O. Czoske
; M. Donahue
; O. Graur
; G. Graves
; L. Infante
; S. Jha
; D. Kelson
; O. Lahav
; R. Lazkoz
; D. Lemze
; M. Lombardi
; D. Maoz
; C. McCully
; E. Medezinski
; P. Melchior
; M. Meneghetti
; J. Merten
; A. Molino
; L.A. Moustakas
; S. Ogaz
; B. Patel
; E. Regoes
; A. Riess
; S. Rodney
; K. Umetsu
; A. Van der Wel
; | | Date: |
13 Jul 2011 | | Abstract: | 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 $1la
zla5.5$, 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 $dlog Sigma/dlog hetasimeq
-0.55pm 0.1$ (in the range [1arcsec,53arcsec], or $5la r la300$ 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 $z_{s}simeq2.5$, the critical
curve encloses a large area with an effective Einstein radius of
$ heta_{E}=28pm3arcsec$, and a projected mass of $1.34pm0.15 imes10^{14}
M_{odot}$. From the current understanding of structure formation in concordant
cosmology, these values are relatively high for clusters at $zsim0.5$, so that
detailed studies of the inner mass distribution of clusters such as MACS
J1206.2-0847 can provide stringent tests of the $Lambda$CDM paradigm. | | Source: | arXiv, 1107.2649 | | Services: | Forum | Review | PDF | Favorites | |
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