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THE CLUSTER LENSING AND SUPERNOVA SURVEY WITH HUBBLE (CLASH): STRONG-LENSING ANALYSIS OF A383 FROM 16-BAND HST/WFC3/ACS IMAGING

ASTROPHYSICAL JOURNAL Volume: 742 Issue: 2 Article Number: 117 DOI: 10.1088/0004-637X/742/2/117 Published: DEC 1 2011

Authors:
Zitrin, A (Zitrin, A.)1; Broadhurst, T (Broadhurst, T.)2,3; Coe, D (Coe, D.)4; Umetsu, K (Umetsu, K.)5; Postman, M (Postman, M.)4; Benitez, N (Benitez, N.)6; Meneghetti, M (Meneghetti, M.)7,8; Medezinski, E (Medezinski, E.)9; Jouvel, S (Jouvel, S.)10; Bradley, L (Bradley, L.)4; Koekemoer, A (Koekemoer, A.)4; Zheng, W (Zheng, W.)9; Ford, H (Ford, H.)9; Merten, J (Merten, J.)11; Kelson, D (Kelson, D.)12; Lahav, O (Lahav, O.)10; Lemze, D (Lemze, D.)9; Molino, A (Molino, A.)6; Nonino, M (Nonino, M.)13; Donahue, M (Donahue, M.)14; Rosati, P (Rosati, P.)15; Van der Wel, A (Van der Wel, A.)16; Bartelmann, M (Bartelmann, M.)11; Bouwens, R (Bouwens, R.)17; Graur, O (Graur, O.)1; Graves, G (Graves, G.)18; Host, O (Host, O.)10; Infante, L (Infante, L.)19; Jha, S (Jha, S.)20; Jimenez-Teja, Y (Jimenez-Teja, Y.)6; Lazkoz, R (Lazkoz, R.)2; Maoz, D (Maoz, D.)1; McCully, C (McCully, C.)20; Melchior, P (Melchior, P.)21,22; Moustakas, LA (Moustakas, L. A.)23; Ogaz, S (Ogaz, S.)4; Patel, B (Patel, B.)20; Regoes, E (Regoes, E.)24; Riess, A (Riess, A.)4,9; Rodney, S (Rodney, S.)9; Seitz, S (Seitz, S.)25

Abstract:
We examine the inner mass distribution of the relaxed galaxy cluster A383 (z = 0.189), in deep 16 band Hubble Space Telescope/ACS+WFC3 imaging taken as part of the Cluster Lensing And Supernova survey with Hubble (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, 2000-16000 angstrom, 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 nine systems are used to tightly constrain the inner mass profile gradient, d log Sigma/d log r similar or equal to -0.6 +/- 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 inner mass profile derived here is consistent with the results of our independent weak-lensing analysis of wide-field Subaru images, with good agreement in the region of overlap (similar to 0.7-1 arcmin). Combining weak and strong lensing, the overall mass profile is well fitted by a Navarro-Frenk-White profile with M(vir) = (5.37(-0.63)(+0.70) +/- 0.26) x 10(14) M(circle dot) h(-1) and a relatively high concentration, c(vir) = 8.77(-0.42)(+0.44) +/- 0.23, which lies above the standard c-M relation similar to other well-studied clusters. The critical radius of A383 is modest by the standards of other lensing clusters, r(E) similar or equal to 16 +/- 2 '' (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.

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