P. Popesso (ESO), A. Biviano (Osservatorio di Trieste), H. B öhringer (MPE), M. Romaniello (ESO). The RASS-SDSS Galaxy Cluster Survey. The Survey:
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The cluster composite LF is obtained by stacking the individual LFs (background subtracted) within the virial radius.
in the r band
The composite cluster LF, calculated within the virial radius, is a good representation for more than 90% of the clusters, as confirmed by the 2 test.
When measured within the physical size of the systems (given by r200), the Cluster LF isuniversal
(Popesso et al. 2005)
Composite cluster LF is able to locate the BCGs (Popesso et al. 2005, A&A submitted).
Solid line LBCG
Lin & Mohr (2004) , Yang et al. (2005)
We use the color cut at u-r=2.22 of Strateva et al. (2001) to distinguish red early type galaxies from blue late type galaxies.
Early type galaxies Late type galaxies
Popesso et al. 2005c, astro-ph/0506201
Lx M2002.04 0.04
(Popesso et al. 2005, A&A, 433, 431)
AXU clusters: leptokurtic distribution in the outer region,
typical of systems in accretion