Lens magnification by CL0024+1654 in the U and R band

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dc.creatorDye, S.
dc.creatorTaylor, A. N.
dc.creatorGreve, T. R.
dc.creatorRognvaldsson, O. E.
dc.creatorvan Kampen, E.
dc.creatorJakobsson, P.
dc.creatorSigmundsson, V. S.
dc.creatorGudmundsson, E. H.
dc.creatorHjorth, J.
dc.date2001-08-24
dc.date2002-01-28
dc.date.accessioned2026-07-07T06:28:19Z
dc.date.available2026-07-07T06:28:19Z
dc.description[ABRIDGED] We estimate the total mass distribution of the galaxy cluster CL0024+1654 from the measured source depletion due to lens magnification in the R band. Within a radius of 0.54Mpc/h, a total projected mass of (8.1+/-3.2)*10^14 M_sol/h (EdS) is measured, which corresponds to a mass- to-light ratio of M/L(B)=470+/-180. We compute the luminosity function of CL0024+1654 in order to estimate contamination of the background source counts from cluster galaxies. Three different magnification-based reconstruction methods are employed using both local and non-local techniques. We have modified the standard single power-law slope number count theory to incorporate a break and applied this to our observations. Fitting analytical magnification profiles of different cluster models to the observed number counts, we find that the cluster is best described either by a NFW model with scale radius r_s=334+/-191 kpc/h and normalisation kappa_s=0.23+/-0.08 or a power-law profile with slope xi=0.61+/-0.11, central surface mass density kappa_0=1.52+/-0.20 and assuming a core radius of r_core=35 kpc/h. The NFW model predicts that the cumulative projected mass contained within a radius R scales as M(<R)=2.9*10^14*(R/1')^[1.3-0.5lg (R/1')] M_sol/h. Finally, we have exploited the fact that flux magnification effectively enables us to probe deeper than the physical limiting magnitude of our observations in searching for a change of slope in the U band number counts. We rule out both a total flattening of the counts with a break up to U_AB<=26.6 and a change of slope, reported by some studies, from dlog N/dm=0.4->0.15 up to U_AB<=26.4 with 95% confidence.
dc.description19 pages, 12 figures, submitted to A&A. New version includes more robust U band break analysis and contamination estimates, plus new plots
dc.identifierhttps://arxiv.org/abs/astro-ph/0108399
dc.identifierhttp://arxiv.org/abs/astro-ph/0108399
dc.identifierAstron.Astrophys. 386 (2002) 12-30
dc.identifierdoi:10.1051/0004-6361:20020226
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/97661
dc.subjectAstrophysics
dc.titleLens magnification by CL0024+1654 in the U and R band
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