Searches for High Redshift Galaxies using Gravitational Lensing

J. Richard (1) , R. Pelló (1) , J.-P. Kneib (2) , D. Schaerer (1) , M. R. Santos (3) , R. Ellis (3)

1 IRAP - Institut de recherche en astrophysique et planétologie
2 LAM - Laboratoire d'Astrophysique de Marseille
3 CALTECH - California Institute of Technology

We present different methods used to identify high redshift (z>5) objects in the high-magnification regions of lensing galaxy clusters, taking advantage of very well constrained lensing models. The research procedures are explained and discussed. The detection of emission lines in the optical/NIR spectra, such as Lyman-alpha, allows us to determine the redshift of these sources. Thanks to the lensing magnification, it is possible to identify and to study more distant or intrinsically fainter objects with respect to standard field surveys.

Domaines: Cosmologie et astrophysique extra-galactique [astro-ph.CO]; Cosmologie et astrophysique extra-galactique [astro-ph.CO]

J. Richard, R. Pelló, J.-P. Kneib, D. Schaerer, M. R. Santos, et al.. Searches for High Redshift Galaxies using Gravitational Lensing. Multiwavelength Cosmology., Jun 2003, France. pp.27. ⟨hal-00661234⟩