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Mass and Light in the Supercluster of galaxies : MS0302+17 | | R. Gavazzi
; Y. Mellier
; B. Fort
; J.-C. Cuillandre
; M. Dantel-Fort
; | | Date: |
20 Dec 2003 | | Journal: | Astron.Astrophys. 422 (2004) 407-422 | | Subject: | astro-ph | | Affiliation: | 1,2), B. Fort , J.-C. Cuillandre and M. Dantel-Fort ( IAP Paris, LERMA Obs. Paris, CFHT Hawaii | | Abstract: | We investigate the supercluster MS0302+17 (z~0.42) using weak lensing analysis and deep wide field CFH12k BVR photometry. Using (B-V) - (V-R) evolution tracks we identify supercluster early-types members. We derive a R band weak lensing background galaxies sample. We compute the correlations functions of light and mass and show that "light traces mass on supercluster scales". The zeta-statistics applied in cluster centers and global correlation analyses over the whole field converge toward the simple relation M/L_B=300+/-30. This independently confirms the earlier results obtained by Kaiser et al.(1998). We model dark matter halos around each galaxy by truncated isothermal spheres and find the linear relation M L still holds. However, their averaged halo truncation radius is s* ~< 200 kpc close to clusters cores, whereas it reaches a lower limit of ~ 300 kpc at the periphery. This change of s_* as function of radial distance gives indications on tidal stripping but the lack of informations on the late-type galaxies sample prevents us to separate contributions. Though all the data at hands are consistent with "mass is traced by light from early-type galaxies", we are not able to describe in details the contributions of late type galaxies. We however found it to be small. | | Source: | arXiv, astro-ph/0401403 | | Services: | Forum | Review | PDF | Favorites | |
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