1999A&A...346..359P


C.D.S. - SIMBAD4 rel 1.7 - 2020.05.27CEST09:13:24

1999A&A...346..359P - Astronomy and Astrophysics, volume 346, 359-368 (1999/6-2)

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. and BRIDGES T.J.

Abstract (from CDS):

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 (1998ApJ...499L.115F), 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 α, 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–150kpc 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.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: general - galaxies: clusters: individual: - cosmology: observations - cosmology: dark matter - cosmology: gravitational lensing

Nomenclature: Fig.1: [PKL99] ACO 2390 HN (Nos H3, H5), [PKL99] ACO 2390 HNa (Nos H3a-H3c, H5a-H5b).

Status at CDS:  

CDS comments: Kneib+ 1999 not published in 2005, H3 and H5 are designated as [PKL99] objects.

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 ACO 851 ClG 09 42 56.6 +46 59 22           ~ 308 0
2 ACO 2218 ClG 16 35 54.0 +66 13 00           ~ 779 1
3 [PKL99] ACO 2390 H3b LeI 21 53 33.39 +17 41 52.5           ~ 4 0
4 [PKL99] ACO 2390 H3c LeI 21 53 33.62 +17 41 56.8           ~ 3 0
5 NAME ACO 2390 Cusp Arc LeI 21 53 33.62 +17 41 56.8   23.48       ~ 8 0
6 [PKL99] ACO 2390 H3a LeI 21 53 34.0 +17 42 03           ~ 6 0
7 [PLS91] A LeG 21 53 34.520 +17 42 02.32           ~ 10 0
8 ACO 2390 ClG 21 53 34.6 +17 40 11           ~ 624 2
9 [PKL99] ACO 2390 H5b LeI 21 53 35.0 +17 41 33           ~ 7 0
10 [PKL99] ACO 2390 H5 LeI 21 53 35.29 +17 41 40.0           ~ 3 0
11 [PKL99] ACO 2390 H5a LeI 21 53 35.43 +17 41 46.6           ~ 4 0

    Equat.    Gal    SGal    Ecl

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2020.05.27-09:13:24

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