Two multiple-imaged z=4.05 galaxies in the cluster-lens Abell 2390

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dc.creatorPello, R.
dc.creatorKneib, J. -P.
dc.creatorBorgne, J. -F. Le
dc.creatorBezecourt, J.
dc.creatorEbbels, T. M.
dc.creatorTijera, I.
dc.creatorBruzual, G.
dc.creatorMiralles, J. M.
dc.creatorSmail, I.
dc.creatorSoucail, G.
dc.creatorBridges, T. J.
dc.date1998-10-23
dc.date1999-04-14
dc.date.accessioned2026-07-07T02:28:42Z
dc.date.available2026-07-07T02:28:42Z
dc.descriptionWe 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 A2390. The 2 objects presented in this paper, namely H3 and H5, were identified through lens modelling as multiple images of high-redshift sources at z>3.5. 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 3 different images at z~4: the brightest image of H3, which 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 sources located ~100 kpc part on the source plane, with mean metallicities compatible with a fraction of solar or even solar values. All these results seem to favour a hierarchical merging scenario, where we are actually seeing a relatively advanced step for these 2 z~4 objects, with stars forming locally and efficiently from a preenriched gas.
dc.description11 pages, A&A in press, final version sent to the Editor
dc.identifierhttps://arxiv.org/abs/astro-ph/9810390
dc.identifierhttp://arxiv.org/abs/astro-ph/9810390
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/13175
dc.subjectAstrophysics
dc.titleTwo multiple-imaged z=4.05 galaxies in the cluster-lens Abell 2390
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