The Cluster Lensing and Supernova Survey with Hubble (CLASH): Strong-Lensing analysis of A383 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. DonahueP. 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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We examine the inner mass distribution of the relaxed galaxy cluster A383 (z = 0.189), in deep 16band 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 Å, 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, dlog Σ/dlog r ≃ -0.6 0.1 (r < 160kpc). 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 (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 +0.70 - 0.63± 0.26) × 1014 M h -1 and a relatively high concentration, c vir = 8.77+0.44 - 0.42± 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, rE ≃ 16 2″ (for zs = 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.

Original languageEnglish
Article number117
JournalAstrophysical Journal
Volume742
Issue number2
DOIs
StatePublished - 1 Dec 2011

Funding

FundersFunder number
Directorate for Mathematical and Physical Sciences0847157

    Keywords

    • dark matter
    • galaxies: clusters: general
    • galaxies: clusters: individual: A383
    • galaxies: high-redshift
    • gravitational lensing: strong

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