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We report significant associated clustering in the field of a z = 1.226 quasar from the Clowes-Campusano LQG in the form of both a factor ˜ 11 overdensity of I - K > 3.75 galaxies, and red sequences of 15-18 galaxies at I - K ⋍ 4.3, V - K ⋍ 6.9 indicative of a population of massive ellipticals at the quasar redshift. The quasar is located between two groups of these galaxies, with further clustering extending over 2-3 Mpc. A band of V - I < 1 galaxies bisects the two groups of red sequence galaxies, and we suggest that the merging of these two groups has triggered both this band of star-formation and the quasar.
We use the weak gravitational lensing effect to study the mass distribution of a
sample of 50 southern Abell
clusters (0.05 < z < 0.3) having LX > 5 × 1044 erg s-1 observed with ESO-VLT
under uniform sky conditions and subarsecond (0.6'') image quality. Their dynamical
equibrium is assesed through comparison of the clusters mass estimates made by weak-lensing,
velocity-dispersions and X-ray techniques. So far, for 24 clusters (Cypriano
et al. 2004),
we find: a) the center of their mass and light distributions are coincident for
77% of the sample; b) the elongations of the fitted mass profiles and of the light
of the cD galaxies generally match with each other; c) although most
of the clusters are found to be in dynamical equilibrium, those with TX ≥ 8 keV
(or σv ≥ 1120 km s-1) are the discordant ones. The preliminary
bright arc statistics for our whole sample (LZLS) suggests the presence of a
cut-off at z ~ 0.07 which is qualitatively consistent with predictions done
in a ΛCDM cosmology (Meneghetti et al. 2003).
2002–2005 has seen rapid progress in cosmology with the publication of the 1st year WMAP results and analyses of large scale red-shift surveys, ushering in an era of “precision cosmology”. There has been steady progress, too, in the discovery and study of quasars and galaxies in the early Universe.
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