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Issue A&A
Volume 428, Number 3, December IV 2004
Page(s) 741 - 755
Section Cosmology (including clusters of galaxies)
DOI http://dx.doi.org/10.1051/0004-6361:20040406



A&A 428, 741-755 (2004)
DOI: 10.1051/0004-6361:20040406

A search for clusters and groups of galaxies on the line of sight towards 8 lensed quasars

C. Faure1, D. Alloin2, 3, J. P. Kneib4, 5 and F. Courbin6

1  Universidad Católica de Chile, Departamento de Astronomia y Astrofisica, Casilla 306, Santiago 22, Chile
    e-mail: cfaure@astro.puc.cl
2  European Southern Observatory, Alonso de Cordova 3107, Casilla 19001, Santiago 19, Chile
3  URA2052CNRS/SAp/CEA, L'Orme des Merisiers, 91191 Gif-sur-Yvette, France
4  Observatoire Midi-Pyrénées, UMR 5572, 14 avenue Édouard Belin, 31400 Toulouse, France
5  Caltech Astronomy Department, Mail Code 105-24, Pasadena, CA 91125, USA
6  Institut d'Astrophysique et de Géophysique, Faculté des Sciences, Université de Liège, Allée du 6 août, 17, B5C, Liège 1, Belgium

(Received 8 March 2004 / Accepted 19 May 2004 )

Abstract
In this paper we present new ESO/VLT FORS1 and ISAAC images of the fields around eight gravitationally lensed quasars: CTQ 414, HE 0230-2130, LBQS 1009-0252, B 1030+074, HE 1104-1805, B 1359+154, H 1413+117 and HE 2149-2745. When available and deep enough, HST/WFPC2 data were also used to infer the photometric redshifts of the galaxies around the quasars. The search of galaxy overdensities in space and redshift, as well as a weak-shear analysis and a mass reconstruction are presented in this paper. We find that there are most probably galaxy groups towards CTQ 414, HE 0230-2130, B 1359+154, H 1413+117 and HE 2149-2745, with masses $\leq$ $4\times 10^{14}$  $M_\odot$ h -1. Considering its photometric redshift, the galaxy group discovered in the field around HE 1104-1805 is associated with the quasar rather than with the lensing potential.


Key words: galaxies: clusters: general -- gravitational lensing

SIMBAD Objects



© ESO 2004


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