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The Cluster Lensing and Supernova Survey with Hubble (CLASH): Strong Lensing Analysis of Abell 383 from 16-Band HST WFC3/ACS Imaging | | A. Zitrin
; T. Broadhurst
; D. Coe
; K. Umetsu
; M. Postman
; N. Benítez
; M. Meneghetti
; E. Medezinski
; S. Jouvel
; L. Bradley
; A. Koekemoer
; W. Zheng
; H. Ford
; J. Merten
; D. Kelson
; O. Lahav
; D. Lemze
; A. Molino
; M. Nonino
; M. Donahue
; P. Rosati
; A. Van der Wel
; M. Bartelmann
; R. Bouwens
; O. Graur
; G. Graves
; O. Host
; L. Infante
; S. Jha
; Y. Jimenez-Teja
; R. Lazkoz
; D. Maoz
; C. McCully
; P. Melchior
; L.A. Moustakas
; S. Ogaz
; B. Patel
; E. Regoes
; A. Riess
; S. Rodney
; S. Seitz
; | | Date: |
29 Mar 2011 | | Abstract: | We examine the inner mass distribution of the relaxed cluster Abell 383
(z=0.189), in deep 16-band HST/ACS+WFC3 imaging taken as part of the CLASH
multi-cycle treasury program. Our program is designed to study the dark matter
distribution in 25 massive clusters, and balances depth with a wide wavelength
coverage, 2000-16000AA, to better identify lensed systems and generate precise
photometric redshifts. This photometric information together with the
predictive strength of our strong-lensing analysis method identifies 13 new
multiply-lensed images and candidates, so that a total of 27 multiple-images of
9 systems are used to tightly constrain the gradient inner mass profile, $dlog
Sigma/dlog rsimeq -0.6pm 0.1$ (r<160 kpc). We find consistency with the
standard distance-redshift relation for the full range spanned by the lensed
images, 1.01<z<6.03, with the higher redshift sources deflected through larger
angles as expected. The derived inner mass profile is consistent with the
results of our independent weak-lensing analysis of wide-field Subaru images,
with good agreement in the region of overlap. Combining weak and strong
lensing, the overall mass profile is well fitted by an NFW profile with
M_{vir}=6.26^{+0.26}_{-0.25} x 10^{14}M_{odot}/h and a relatively high
concentration, c_{vir} = 8.59^{+0.21}_{-0.20}, which lies above the standard
c-M relation similar to other well-studied clusters. The critical radius of
Abell 383 is modest by the standards of other lensing clusters,
r_{E}simeq16pm2arcsec (for z_s=2.55), so the relatively large number of
lensed images uncovered here with precise photometric redshifts validates our
imaging strategy for the CLASH survey. In total we aim to provide similarly
high-quality lensing data for 25 clusters, 20 of which are X-ray selected
relaxed clusters, enabling a precise determination of the representative mass
profile free from lensing bias. | | Source: | arXiv, 1103.5618 | | Services: | Forum | Review | PDF | Favorites | |
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