Abstract
We use highquality Subaru/SuprimeCam imaging data to conduct a detailed weak lensing study of the distribution of dark matter in a sample of 30 Xray luminous galaxy clusters at 0.15 6 x 10(14) h(1) Mcircle dot) mass bins. We also used individual cluster NFW model fits to investigate the relationship between the cluster mass and the concentration, finding that the concentration (c(vir)) decreases with increasing cluster mass The bestfit c(vir)Mvir relation is: c(vir)(Mvir) = 8.75(2.89)(+4.13) x (Mvir/10(14) h(1) Mcircle dot)(alpha) with a alpha approximate to 0.40 +/ 0.19: i.e., a nonzero slope is detected at 2 sigma significance. This relation gives a concentration of c(vir) = 3.48(1.15)(+1.65) for clusters with Mvir = 10(15) h(1) Mcircle dot, which is inconsistent at 4 sigma significance with the values of c(vir) similar to 10 reported for stronglensingselected clusters. We have found that the measurement error on the cluster mass is smaller at higher overdensities, Delta similar or equal to 5002000, than at the virial overdensity, Delta(vir) similar or equal to 110; typical fractional errors at Delta similar or equal to 5002000 are improved to sigma(MDelta)/MDelta similar or equal to 0.10.2 compared with 0.20.3 at Delta(vir). Furthermore, comparing the 3D spherical mass with the 2D cylinder mass, obtained from the aperture mass method at a given aperture radius, theta(Delta), reveals M2D(<theta(Delta))/M3D(<r(Delta) = D1 theta(Delta)) similar or equal to 1.46 and 1.32 for Delta = 500 and Delta(vir), respectively. The amplitude of this offset agrees well with that predicted by integrating an NFW model of clusterscale halos along the lineofsight.
Original language  English 

Pages (fromto)  811870 
Number of pages  60 
Journal  Publications of the Astronomical Society of Japan 
Volume  62 
Issue number  3 
Publication status  Published  1 Jan 2010 
Keywords
 galaxies: clusters
 gravitational lensing
 dark matter
 cosmology: observations
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The PASJ Excellent Paper Award
Okabe, Nobuhiro (Recipient), Takada, Masahiro (Recipient), Umetsu, Keiichi (Recipient), Futamase, Toshifumi (Recipient) & Smith, Graham (Recipient), 2012
Prize: Prize (including medals and awards)