2007ApJ...660...47D


Query : 2007ApJ...660...47D

2007ApJ...660...47D - Astrophys. J., 660, 47-61 (2007/May-1)

Spectroscopy of z ∼ 6 i-dropout galaxies: frequency of Lyα emission and the sizes of Lyα-emitting galaxies.

DOW-HYGELUND C.C., HOLDEN B.P., BOUWENS R.J., ILLINGWORTH G.D., VAN DER WEL A., FRANX M., VAN DOKKUM P.G., FORD H., ROSATI P., MAGEE D. and ZIRM A.

Abstract (from CDS):

We report on deep spectroscopy, using LRIS on Keck I and FORS2 on the VLT, of a sample of 22 candidate z∼6 Lyman break galaxies (LBGs) selected by the i775-z850>1.3 dropout criterion. Redshifts could be measured for eight objects. These redshifts are all in the range z=5.5-6.1, confirming the efficiency of the i775-z850 color selection technique. Six of the confirmed galaxies show Lyα emission. Assuming that the 14 objects without redshifts are z∼6 LBGs that lack detectable Lyα emission lines, we infer that the fraction of Lyα-emitting LBGs with Lyα equivalent widths greater than 20 Å among z∼6 LBGs is ~30%, similar to that found at z∼3. Every Lyα-emitting object in our sample is compact, with half-light radii rhl≤0.14". Furthermore, all the Lyα-emitting objects in our sample are more compact than average relative to the observed size-magnitude relation of a large i-dropout sample (332 candidate z∼6 objects). We can reject the hypothesis that the Lyα-emitting population is a subset of the rest of the z∼6 LBG population at >97% confidence. We speculate that the small sizes of the Lyα-emitting LBGs are due to these objects being less massive than other LBGs at z∼6.

Abstract Copyright:

Journal keyword(s): Cosmology: Early Universe - Galaxies: Evolution - Galaxies: Formation - Galaxies: High-Redshift - Galaxies: Starburst

Nomenclature: Fig.10, Tables 1, 3: [DHB2007] BD NN N=14 among (Nos 00-66). Fig.10, Tables 2, 4: [DHB2007] UDF PFs1 iN (Nos i0, i1, i9), [DHB2007] UDF PFs iN N=5 among (Nos i0-i9), [DHB2007] GOODS i6 0 N=1.

Simbad objects: 28

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Number of rows : 28
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 MUSE-WIDE 135041231 G 03 32 33.259 -27 47 24.78   30.0432 28.44     ~ 22 0
2 [DHB2007] UDF PFs1 i1 G 03 32 34.892 -27 57 10.74           ~ 1 0
3 [DHB2007] UDF PFs1 i0 G 03 32 35.604 -27 57 37.51           ~ 1 0
4 GOODS J033239.82-275258.1 EmG 03 32 39.8178 -27 52 58.091         27.6300 ~ 10 0
5 UDFP 1-4650-3354 G 03 32 40.707 -27 57 24.28           ~ 1 0
6 GLARE 3011 EmG 03 32 43.10 -27 45 17.6           ~ 6 0
7 UDFP 1-3851-2438 G 03 32 43.959 -27 56 43.87           ~ 2 0
8 VUDS 532000014 EmG 03 32 46.0406 -27 49 29.715         28.4753 ~ 24 0
9 GOODS J033246.43-275524.4 G 03 32 46.410 -27 55 24.32           ~ 3 0
10 UDFP 1-2954-1152 G 03 32 48.368 -27 55 54.82           ~ 1 0
11 UDFP 1-3407-1028 G 03 32 48.952 -27 56 16.97           ~ 2 0
12 NAME Hubble Deep Field reg 12 36 49.5 +62 12 58           ~ 1857 1
13 [DHB2007] BD 48 G 12 52 42.7537 -29 27 18.894           ~ 2 0
14 [DHB2007] BD 00 G 12 52 42.927 -29 29 20.05           ~ 2 0
15 [DHB2007] BD 03 G 12 52 45.3816 -29 28 27.105           ~ 3 0
16 [DHB2007] BD 57 G 12 52 49.441 -29 27 53.24           ~ 1 0
17 [DHB2007] BD 27 G 12 52 51.902 -29 26 28.60           ~ 2 0
18 [DHB2007] BD 58 G 12 52 52.2832 -29 28 04.743           ~ 3 0
19 [DHB2007] BD 22 G 12 52 53.346 -29 27 10.58           ~ 1 0
20 ClG J1252-2927 ClG 12 52 54.4 -29 27 17           ~ 151 0
21 [DHB2007] BD 66 G 12 52 54.624 -29 24 56.18           ~ 2 0
22 [DHB2007] BD 36 G 12 52 54.944 -29 25 57.52           ~ 1 0
23 [DHB2007] BD 62 G 12 52 56.7460 -29 27 07.631           ~ 2 0
24 [DHB2007] BD 38 G 12 52 56.8880 -29 25 55.503           ~ 3 0
25 [DHB2007] BD 40 G 12 52 59.511 -29 26 58.43           ~ 1 0
26 [DHB2007] BD 44 G 12 53 01.7448 -29 26 03.873           ~ 3 0
27 [DHB2007] BD 46 G 12 53 05.424 -29 24 26.22           ~ 2 0
28 [NTK2004] SDF J132440.6+273607 EmG 13 24 40.643 +27 36 06.94           ~ 12 0

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2021.10.19-16:14:30

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