2010MNRAS.403L..54M

Query : 2010MNRAS.403L..54M

2010MNRAS.403L..54M - Mon. Not. R. Astron. Soc., 403, L54-L58 (2010/March-3)

A search for galaxies in and around an HI overdense region at z = 5.

MATSUDA Y., RICHARD J., SMAIL I., KASHIKAWA N., SHIMASAKU K., FRYE B.L., YAMADA T., NAKAMURA Y., HAYASHINO T. and FUJII T.

Abstract (from CDS):

We present the discovery of a large-scale structure of emission-line galaxies at redshift z = 4.86 behind a massive cluster of galaxies, A1689. Previous spectroscopic observations of a galaxy, A1689-7.1 at z = 4.87, near this structure, revealed a possible overdense region of intergalactic medium (IGM) around the galaxy, which extends at least ∼80 comoving Mpc along the line of sight. In order to investigate whether this z ∼ 5 IGM overdense region contains a galaxy overdensity, we undertook narrow- and broad-band imaging observations around A1689-7.1 with Subaru/Suprime-Cam. We detected 51 candidates as Lyα emitters at redshift z = 4.86 ±0.03 in the 32x24 arcmin2 field of view. After correction for lensing by the foreground cluster, we found a large-scale (∼20x60 comoving Mpc) overdense region of galaxies around A1689-7.1 in the source plane at z = 4.86. The densest peak in this region has an overdensity of δ ∼ 4, suggesting that this structure is probably a good candidate for a protocluster which may evolve into a massive cluster of galaxies in the present-day Universe. A1689-7.1 is located at the edge of this region, where the local galaxy density is ∼1.6 times the mean density and is close to the density contrast in the IGM along the line of sight to A1689-7.1 estimated from the optical depth. The overdensities of galaxies we have found may suggest that at least some parts of the IGM overdense region have already started to form galaxies and moreover they relate to the formation of a protocluster. Although we lack information on the three-dimensional distributions of both IGM and galaxy overdense regions, the similarity of the scales of both regions may suggest that the two are parts of a single large-scale structure, which would be an large edge-on sheet along the line of sight with a size of ∼20 x 60x80 comoving Mpc.

Abstract Copyright: © 2010 The Authors. Journal compilation © 2010 RAS

Journal keyword(s): galaxies: evolution - galaxies: formation - galaxies: individual: A1689-7.1 - cosmology: observations

VizieR on-line data: <Available at CDS (J/MNRAS/403/L54): tables1.dat>

Nomenclature: Fig. 3, Table S1: [MRS2010] NN (Nos 1-51).

Simbad objects: 57

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Number of rows : 57
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 SA 104- reg 12 42 21.0 -00 32 29           ~ 58 0
2 [MRS2010] 39 EmG 13 10 30.41 -01 25 23.2     28.00 27.36   ~ 1 0
3 [MRS2010] 16 EmG 13 10 34.98 -01 11 49.3     27.61 26.85   ~ 1 0
4 [MRS2010] 31 EmG 13 10 37.64 -01 25 07.6     28.00 27.94   ~ 1 0
5 [MRS2010] 9 EmG 13 10 40.21 -01 29 10.2     28.00 28.36   ~ 1 0
6 [MRS2010] 42 EmG 13 10 40.40 -01 22 51.6     28.00 27.88   ~ 1 0
7 [MRS2010] 10 EmG 13 10 41.23 -01 12 20.5     27.75 27.31   ~ 1 0
8 [MRS2010] 32 EmG 13 10 42.13 -01 12 07.7     28.00 28.67   ~ 1 0
9 [MRS2010] 36 EmG 13 10 50.21 -01 29 55.2     28.00 28.67   ~ 1 0
10 [MRS2010] 25 EmG 13 10 55.28 -01 13 19.8     28.00 28.67   ~ 1 0
11 [MRS2010] 5 EmG 13 10 56.04 -01 25 45.0     27.08 26.06   ~ 1 0
12 [MRS2010] 8 EmG 13 10 57.56 -01 23 10.5     27.83 27.50   ~ 1 0
13 [MRS2010] 44 EmG 13 10 58.57 -01 21 17.7     27.66 28.67   ~ 1 0
14 [MRS2010] 1 EmG 13 10 58.70 -01 31 33.0     25.97 24.63   ~ 1 0
15 [MRS2010] 28 EmG 13 10 59.21 -01 17 25.2     28.00 28.67   ~ 1 0
16 [MRS2010] 6 EmG 13 11 00.93 -01 26 16.7     28.00 27.89   ~ 1 0
17 [MRS2010] 47 EmG 13 11 00.93 -01 21 34.6     28.00 28.37   ~ 1 0
18 [MRS2010] 41 EmG 13 11 01.11 -01 23 36.6     28.00 27.27   ~ 1 0
19 [MRS2010] 15 EmG 13 11 03.72 -01 22 44.7     27.66 26.72   ~ 1 0
20 [MRS2010] 14 EmG 13 11 04.63 -01 25 52.7     28.00 28.67   ~ 1 0
21 [MRS2010] 3 EmG 13 11 04.92 -01 21 33.2     27.62 26.17   ~ 1 0
22 [MRS2010] 26 EmG 13 11 05.11 -01 31 49.0     28.00 27.94   ~ 1 0
23 [MRS2010] 45 EmG 13 11 05.46 -01 17 12.8     28.00 28.67   ~ 1 0
24 [MRS2010] 20 EmG 13 11 06.27 -01 16 29.7     27.92 28.67   ~ 1 0
25 [MRS2010] 37 EmG 13 11 06.34 -01 09 26.5     27.37 27.25   ~ 1 0
26 [MRS2010] 12 EmG 13 11 07.07 -01 30 24.4     28.00 27.26   ~ 1 0
27 [MRS2010] 18 EmG 13 11 07.70 -01 23 27.5     28.00 28.00   ~ 1 0
28 [MRS2010] 4 EmG 13 11 08.02 -01 15 27.5     28.00 26.93   ~ 1 0
29 [MRS2010] 7 EmG 13 11 08.33 -01 16 52.6     28.00 26.59   ~ 1 0
30 [MRS2010] 19 EmG 13 11 08.96 -01 11 51.4     28.00 28.52   ~ 1 0
31 [MRS2010] 40 EmG 13 11 09.63 -01 19 17.7     28.00 27.12   ~ 1 0
32 [MRS2010] 38 EmG 13 11 09.67 -01 14 38.1     28.00 27.25   ~ 1 0
33 [MRS2010] 35 EmG 13 11 14.19 -01 10 36.4     28.00 28.41   ~ 1 0
34 [MRS2010] 17 EmG 13 11 15.69 -01 15 22.8     28.00 28.44   ~ 1 0
35 [MRS2010] 27 EmG 13 11 16.10 -01 12 10.4     28.00 28.16   ~ 1 0
36 [MRS2010] 29 EmG 13 11 16.13 -01 30 19.5     28.00 28.25   ~ 1 0
37 [MRS2010] 43 EmG 13 11 16.15 -01 30 42.8     28.00 28.67   ~ 1 0
38 [MRS2010] 34 EmG 13 11 16.65 -01 21 09.3     28.00 28.67   ~ 1 0
39 [MRS2010] 48 EmG 13 11 18.93 -01 26 12.7     28.00 28.13   ~ 1 0
40 [MRS2010] 2 EmG 13 11 20.32 -01 31 56.9     26.88 25.80   ~ 1 0
41 [MRS2010] 50 EmG 13 11 23.72 -01 18 48.3     28.00 28.67   ~ 1 0
42 [MRS2010] 33 EmG 13 11 24.84 -01 17 08.0     27.65 27.86   ~ 1 0
43 [CBB2010b] A1689 368 LeG 13 11 25.4470 -01 20 51.740           ~ 16 0
44 [MRS2010] 51 EmG 13 11 26.53 -01 18 40.9     27.55 27.57   ~ 1 0
45 [MRS2010] 22 EmG 13 11 26.68 -01 23 05.3     28.00 26.76   ~ 1 0
46 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1178 0
47 [MRS2010] 49 EmG 13 11 32.51 -01 15 06.7     28.00 27.33   ~ 1 0
48 [MRS2010] 30 EmG 13 11 33.08 -01 15 04.2     28.00 27.26   ~ 1 0
49 [MRS2010] 11 EmG 13 11 41.52 -01 19 14.1     28.00 28.07   ~ 1 0
50 [MRS2010] 46 EmG 13 11 56.43 -01 10 39.4     28.00 28.37   ~ 1 0
51 [MRS2010] 24 EmG 13 12 16.51 -01 23 05.0     27.89 27.64   ~ 1 0
52 [MRS2010] 13 EmG 13 12 22.38 -01 16 09.8     27.96 26.73   ~ 1 0
53 [MRS2010] 21 EmG 13 12 27.48 -01 16 21.8     27.49 27.51   ~ 1 0
54 [MRS2010] 23 EmG 13 12 32.17 -01 19 42.2     28.00 28.67   ~ 1 0
55 HZ 44 HS* 13 23 35.2629445608 +36 07 59.544140304 10.186 11.42 11.65 12.00 11.995 sdBN0VIIHe28 439 0
56 NAME Subaru Deep Field NGP reg 13 24 21.3 +27 29 23           ~ 330 1
57 TYC 447-268-1 * 18 40 52.3393681008 +00 01 54.758448624 13.392 13.245 12.516 12.077 11.627 ~ 17 0

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