NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-04-25 T13:47:30 PDT
Help | Comment | NED Home

For refcode 1999A&A...346..359P:
Retrieve 3 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by European Southern Observatory (ESO). Reproduced by permission
1999A&A...346..359P Two multiple-imaged z = 4.05 galaxies in the cluster-lens Abell 2390. PELLO R., KNEIB J.P., LE BORGNE J.F., BEZECOURT J., EBBELS T.M., TIJERA I., BRUZUAL G., MIRALLES J.M., SMAIL I., SOUCAIL G., BRIDGES T.J. Received 26 October 1998/Accepted 12 April 1999 Abstract: We present the first results on the identification and study of very distant field galaxies in the core of cluster-lenses, using a selection criterium based on both lens modelling and photometric redshifts. We concentrate on two multiple-imaged sources at z=4.05 in the cluster Abell 2390. The two objects presented in this paper, namely H3 (cusp arc) and H5 (fold arc), were identified through lens modelling as multiple images of high-redshift sources at z>~3.5 (Kneib et al., 1999, in prep.). We confirm the excellent agreement between this identification and both their photometric redshifts and morphologies. Our CFHT/WHT program for a systematic redshift survey of arcs in clusters has allowed to obtain a set of spectra on three different images at z~4: the brightest image of H3, whose redshift was already confirmed by Frye & Broadhurst (1998), and the two brightest images of H5. The later is then confirmed spectroscopically as a multiple image, giving a strong support to the lens model. The main feature in each of these spectra is a strong emission line, identified as Ly{alpha}, leading to z=4.05 for both H3 and H5. The spectrophotometric properties of these galaxies are studied, in particular the degeneracy in the parameter-space defined by the SFR type, age, metallicity and reddening. H3 and H5 are intrinsically bright and clumpy galaxies (M_B_^*^ to M_B_^*^-2 magnitudes), located ~100h_50_^-1^ kpc apart on the source plane, with mean metallicities compatible with a fraction of solar or even solar values. These results seem to favour a hierarchical merging scenario, where we are seeing a relatively evolved phase in these two z~4 objects, with stars forming locally and efficiently. Keywords: galaxies: clusters: general - galaxies: clusters: individual: - cosmology: observations - cosmology: dark matter - cosmology: gravitational lensing
Retrieve 3 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home