2008ApJ...673..143O

Query : 2008ApJ...673..143O

2008ApJ...673..143O - Astrophys. J., 673, 143-162 (2008/January-3)

Lyman break galaxies, Lyα emitters, and a radio galaxy in a protocluster at z = 4.1.

OVERZIER R.A., BOUWENS R.J., CROSS N.J.G., VENEMANS B.P., MILEY G.K., ZIRM A.W., BENITEZ N., BLAKESLEE J.P., COE D., DEMARCO R., FORD H.C., HOMEIER N.L., ILLINGWORTH G.D., KURK J.D., MARTEL A.R., MEI S., OLIVEIRA I., ROTTGERING H.J.A., TSVETANOV Z.I. and ZHENG W.

Abstract (from CDS):

We present deep HST ACS observations in g475r625i775z850 toward the z=4.1 radio galaxy TN J1338-1942 and its overdensity of >30 spectroscopically confirmed Lyα emitters (LAEs). We select 66 g475 band dropouts to z850,5σ=27, 6 of which are also LAEs. Although our color-color selection results in a relatively broad redshift range centered on z=4.1, the field of TN J1338-1942 is richer than the average field at the >5 σ significance, based on a comparison with GOODS. The angular distribution is filamentary with about half of the objects clustered near the radio galaxy, and a small, excess signal (2 σ) in the projected pair counts at separations of θ<10" is interpreted as being due to physical pairs. The LAEs are young (a few times 107 yr), small (<rhl≥0.13") galaxies, and we derive a mean stellar mass of ∼108-109 M☉ based on a stacked Ks band image. We determine star formation rates, sizes, morphologies, and color-magnitude relations of the g475-dropouts and find no evidence for a difference between galaxies near TN J1338-1942 and in the field. We conclude that environmental trends as observed in clusters at much lower redshift are either not yet present or washed out by the relatively broad selection in redshift. The large galaxy overdensity, its corresponding mass overdensity, and the subclustering at the approximate redshift of TN J1338-1942 suggest the assemblage of a >1014 M☉structure, confirming that it is possible to find and study cluster progenitors in the linear regime at z≳4.

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Journal keyword(s): Cosmology: Observations - Cosmology: Early Universe - Galaxies: Clusters: General - Galaxies: High-Redshift - Galaxies: Individual: Alphanumeric: TN J1338-1942 - Galaxies: Starburst - Cosmology: Large-Scale Structure of Universe

VizieR on-line data: <Available at CDS (J/ApJ/673/143): table2.dat table3.dat>

Nomenclature: Table 2: [OBC2008] NNNN N=66 among (Nos 227-3670).

Simbad objects: 80

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Number of rows : 80
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 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 2282 1
2 NAME Hubble Ultra Deep Field reg 03 32 39.0 -27 47 29           ~ 1900 0
3 GLEAM J092419-220140 QSO 09 24 19.92000 -22 01 41.4984       25.850   ~ 90 1
4 PKS J1140-2628 rG 11 40 48.35884 -26 29 08.6316     22.00     ~ 325 1
5 NAME MRC 1138-262 Protocluster PCG 11 40 48.4 -26 29 11           ~ 91 0
6 NAME Hubble Deep Field reg 12 36 49.5 +62 12 58           ~ 1967 1
7 [OBC2008] 3670 G 13 38 20.73 -19 43 16.3           ~ 2 0
8 [OBC2008] 3430 G 13 38 21.21 -19 43 42.0           ~ 2 0
9 [OBC2008] 3486 G 13 38 21.49 -19 43 21.7           ~ 2 0
10 [OBC2008] 3159 G 13 38 22.21 -19 43 50.1           ~ 2 0
11 [OBC2008] 3216 G 13 38 22.37 -19 43 32.4           ~ 2 0
12 [OBC2008] 2874 EmG 13 38 22.46 -19 44 33.7           ~ 2 0
13 [OBC2008] 2989 G 13 38 22.90 -19 43 59.0           ~ 2 0
14 [OBC2008] 3177 G 13 38 22.97 -19 43 16.1           ~ 2 0
15 [OBC2008] 3564 G 13 38 23.34 -19 41 51.4           ~ 2 0
16 [OBC2008] 3304 G 13 38 23.67 -19 42 27.4           ~ 2 0
17 [OBC2008] 2913 G 13 38 23.68 -19 43 36.6           ~ 2 0
18 [OBC2008] 2571 G 13 38 23.70 -19 44 32.2           ~ 2 0
19 [OBC2008] 3133 G 13 38 23.75 -19 42 56.6           ~ 2 0
20 [OBC2008] 2358 G 13 38 24.12 -19 44 47.2           ~ 2 0
21 [OBC2008] 2708 G 13 38 24.13 -19 43 50.5           ~ 2 0
22 [OBC2008] 3013 G 13 38 24.18 -19 43 03.4           ~ 2 0
23 [OBC2008] 3116 G 13 38 24.21 -19 42 41.9           ~ 2 0
24 [OBC2008] 3018 G 13 38 24.31 -19 42 58.1           ~ 2 0
25 [OBC2008] 2407 G 13 38 24.35 -19 44 29.2           ~ 2 0
26 [OBC2008] 2524 G 13 38 24.47 -19 44 07.3           ~ 2 0
27 [VRM2007] J1338.LAE7 EmG 13 38 24.78 -19 41 33.7           ~ 2 0
28 [VRM2007] J1338.LAE8 EmG 13 38 24.86 -19 41 45.5           ~ 2 0
29 [OBC2008] 2799 G 13 38 24.88 -19 43 07.4           ~ 2 0
30 [OBC2008] 2755 G 13 38 24.95 -19 43 16.9           ~ 2 0
31 [OBC2008] 2710 EmG 13 38 25.10 -19 43 10.8           ~ 2 0
32 [OBC2008] 3131 G 13 38 25.27 -19 41 55.5           ~ 2 0
33 [OBC2008] 2439 G 13 38 25.35 -19 43 43.7           ~ 2 0
34 [OBC2008] 2494 G 13 38 25.39 -19 43 34.8           ~ 2 0
35 [OBC2008] 2839 G 13 38 25.90 -19 42 18.4           ~ 2 0
36 NAME TN 1338 Protocluster PCG 13 38 26.05 -19 42 30.5           ~ 8 0
37 [DBC2004] M03 rG 13 38 26.05 -19 42 30.5       22.4   ~ 106 0
38 [VRM2007] J1338.LAE11 EmG 13 38 26.16 -19 43 34.3           ~ 2 0
39 [OBC2008] 2569 G 13 38 26.38 -19 42 43.6           ~ 2 0
40 [OBC2008] 2712 G 13 38 26.54 -19 42 12.0           ~ 2 0
41 [OBC2008] 2152 G 13 38 26.92 -19 43 27.6           ~ 2 0
42 [OBC2008] 1668 G 13 38 26.93 -19 44 53.3           ~ 2 0
43 [OBC2008] 2480 G 13 38 27.25 -19 42 30.4           ~ 2 0
44 [OBC2008] 1991 G 13 38 27.84 -19 43 15.2           ~ 2 0
45 [OBC2008] 1712 G 13 38 27.93 -19 44 05.6           ~ 2 0
46 [OBC2008] 2347 G 13 38 27.99 -19 42 12.2           ~ 2 0
47 [OBC2008] 2527 G 13 38 27.99 -19 41 44.1           ~ 2 0
48 [OBC2008] 1265 G 13 38 28.64 -19 44 52.2           ~ 2 0
49 [OBC2008] 1339 EmG 13 38 28.72 -19 44 37.0           ~ 2 0
50 [OBC2008] 1815 G 13 38 29.01 -19 43 03.3           ~ 2 0
51 [OBC2008] 1866 G 13 38 29.33 -19 42 44.1           ~ 2 0
52 [OBC2008] 1655 G 13 38 29.52 -19 43 10.6           ~ 2 0
53 [OBC2008] 1843 G 13 38 29.54 -19 42 38.8           ~ 2 0
54 [OBC2008] 1819 G 13 38 29.61 -19 42 38.2           ~ 2 0
55 [OBC2008] 1800 G 13 38 29.65 -19 42 39.8           ~ 2 0
56 [VRM2007] J1338.LAE16 EmG 13 38 29.66 -19 43 59.8           ~ 2 0
57 [VRM2007] J1338.LAE17 EmG 13 38 29.86 -19 43 25.8           ~ 2 0
58 [OBC2008] 1876 G 13 38 30.04 -19 42 27.8           ~ 2 0
59 [OBC2008] 1808 G 13 38 30.04 -19 42 22.5           ~ 2 0
60 [OBC2008] 1461 G 13 38 31.37 -19 42 30.9           ~ 2 0
61 [OBC2008] 1203 G 13 38 31.76 -19 42 53.8           ~ 2 0
62 [OBC2008] 1252 G 13 38 31.98 -19 42 37.5           ~ 2 0
63 [OBC2008] 358 G 13 38 32.12 -19 45 04.7           ~ 2 0
64 [OBC2008] 1290 G 13 38 32.15 -19 42 25.6           ~ 2 0
65 [OBC2008] 1152 G 13 38 32.62 -19 42 25.2           ~ 2 0
66 [OBC2008] 959 G 13 38 32.67 -19 43 03.7           ~ 2 0
67 [OBC2008] 375 G 13 38 32.71 -19 44 38.3           ~ 2 0
68 [OBC2008] 367 G 13 38 32.75 -19 44 37.3           ~ 2 0
69 [OBC2008] 307 G 13 38 32.80 -19 44 46.5           ~ 2 0
70 [OBC2008] 538 EmG 13 38 32.83 -19 44 06.9           ~ 2 0
71 [OBC2008] 227 G 13 38 33.02 -19 44 47.6           ~ 2 0
72 [OBC2008] 540 G 13 38 33.26 -19 43 49.5           ~ 2 0
73 [OBC2008] 1211 G 13 38 33.53 -19 42 09.2           ~ 2 0
74 [OBC2008] 552 EmG 13 38 33.56 -19 43 36.0           ~ 2 0
75 [OBC2008] 286 G 13 38 34.08 -19 43 58.1           ~ 2 0
76 [VRM2007] J1338.LAE22 EmG 13 38 34.14 -19 42 52.7           ~ 2 0
77 [OBC2008] 507 G 13 38 34.26 -19 43 12.2           ~ 2 0
78 [OBC2008] 309 G 13 38 34.77 -19 43 27.6           ~ 2 0
79 [OBC2008] 633 EmG 13 38 34.96 -19 42 25.0           ~ 2 0
80 2MASS J18295118+0113196 Y*O 18 29 51.186 +01 13 19.62           ~ 16 0

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