2000ApJ...531...95B

Query : 2000ApJ...531...95B

2000ApJ...531...95B - Astrophys. J., 531, 95-117 (2000/March-1)

Resolving the stellar populations in a z=4 lensed galaxy.

BUNKER A.J., MOUSTAKAS L.A. and DAVIS M.

Abstract (from CDS):

We present deep near-infrared Keck Near-Infrared Camera (NIRC) imaging of a recently discovered z=4.04 galaxy. This is lensed by the rich foreground cluster Abell 2390 (z~0.23) into highly magnified arcs 3"-5" in length. Our H and K' band NIRC imaging allows us to map the Balmer+4000 Å break amplitude. In combination with high-quality archival Hubble Space Telescope (HST) WFPC2 data, we can spatially resolve stellar populations along the arcs. The WFPC2 images clearly reveal several bright knots, which correspond to sites of active star formation. However, there are considerable portions of the arcs that are significantly redder, consistent with being observed ≳100 Myr after star formation has ceased. Keck Low-Resolution Imaging Spectrograph (LRIS) long-slit spectroscopy along the arcs reveals that the Lyα emission is spatially offset by ~1" from the rest-UV continuum regions. We show that this line emission is most probably powered by star formation in neighboring H II regions and that the z=4 system is unlikely to be an active galactic nucleus.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Evolution - Galaxies: Formation - Galaxies: Photometry - Galaxies: Stellar Content - Cosmology: Gravitational Lensing - Infrared: Galaxies

Nomenclature: Table 1, Fig.3: [FB98] Arc WN (Nos N1-N4, S1-S3).

CDS comments: Table 1: Offset star not in SIMBAD.

Simbad objects: 29

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Number of rows : 29
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 Feige 11 HS* 01 04 21.6747168600 +04 13 37.054495956 10.847 11.826 12.065 12.183 12.324 sdB2VIHe4 136 0
2 [CLV96] NGC 1741 A PoG 05 01 37.81 -04 15 28.9           ~ 3 0
3 NGC 1741 EmG 05 01 38.3 -04 15 25   13.7   13.02 13.6 ~ 273 0
4 HZ 44 HS* 13 23 35.2629445608 +36 07 59.544140304 10.186 11.42 11.65 12.00 11.995 sdBN0VIIHe28 439 0
5 [FIK97] G1 EmG 13 59 49.430 +62 30 45.13           ~ 25 1
6 ZwCl 1358+6245 ClG 13 59 54.3 +62 30 36     18.5     ~ 370 0
7 4C 63.20 rG 14 36 37.366 +63 19 13.03         23.6 ~ 80 1
8 Cl* NGC 6205 KAD 185 * 16 40 41.29 +36 21 13.1   15.38 14.70     G8IV/V 31 0
9 WSTB 53W91 rG 17 22 32.73 +50 06 01.9           ~ 79 0
10 EGGR 150 WD* 21 52 25.3789636654 +02 23 19.576176425 11.942 12.732 12.743 12.839 12.938 DA2.8 213 0
11 CXOU J215333.2+174209 QSO 21 53 33.2 +17 42 09   26.27 25.25     ~ 16 0
12 [FB98] Arc S3 LeI 21 53 33.38 +17 41 52.1           ~ 1 0
13 [FB98] Arc S2 LeI 21 53 33.41 +17 41 52.8           ~ 1 0
14 [FB98] Arc S1 LeI 21 53 33.45 +17 41 53.3           ~ 1 0
15 CNOC ACO 2390 101190 GiC 21 53 33.6 +17 42 00           ~ 5 0
16 [FB98] Arc N1 LeI 21 53 33.64 +17 42 00.6           ~ 1 0
17 [FB98] Arc N2 LeI 21 53 33.67 +17 42 01.5           ~ 1 0
18 [FB98] Arc N3 LeI 21 53 33.74 +17 42 03.0           ~ 1 0
19 [FB98] Arc N4 LeI 21 53 33.78 +17 42 04.0           ~ 1 0
20 NAME ACO 2390 H1 Arc LeG 21 53 34.0 +17 41 59   21.9 21.5   22.68 ~ 17 0
21 [PLS91] B LeI 21 53 34.41 +17 41 58.2           ~ 4 0
22 [CBK2002] 14 LeG 21 53 34.520 +17 42 02.32           ~ 11 0
23 [PLS91] A LeG 21 53 34.520 +17 42 02.32           ~ 10 0
24 ACO 2390 ClG 21 53 37.4 +17 41 46           ~ 732 2
25 Feige 108 HS* 23 16 12.4074790200 -01 50 35.103759540 11.671 12.736 12.973 13.079 13.218 sdB 66 0
26 Feige 110 HS* 23 19 58.3996844256 -05 09 56.171142864 10.360 11.45 11.50 11.970 12.145 sdO8VIIIHe5 673 1
27 [PLS91] 20 ? ~ ~           ~ 2 0
28 [PLS91] 5 ? ~ ~   25.80       ~ 2 0
29 [CLV96] NGC 1741 B PoG ~ ~           ~ 5 0

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