2011/03/31 by Adi Zitrin, A. Zitrin, T. Broadhurst +66
Physics and Astronomy · #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Cluster (spacecraft) #Dark matter #Einstein radius #Galaxies: Formation, Evolution, Phenomena #Galaxy #Galaxy cluster #Gamma-ray bursts and supernovae #Gravitational lens #Hubble space telescope #Mass distribution #Photometric redshift #Physics #RADIUS #Redshift #Virial mass #Weak gravitational lensing #Wide Field Camera 3 #astro-ph.CO
paper · pdf · doi:10.1088/0004-637x/742/2/117
15 pages, 14 figures, 2 tabels; V3 matches the submitted version later published in ApJ
openalex publication_date 2011/11/15 · arxiv created 2012/07/12 · arxiv updated 2012/07/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
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 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, d log Σ/ d log r ≃ −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 (∼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) × 10 14 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, r E ≃ 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.