2009ApJ...698.1934M

Query : 2009ApJ...698.1934M

2009ApJ...698.1934M - Astrophys. J., 698, 1934-1942 (2009/June-3)

Spectroscopic confirmation of two massive red-sequence-selected galaxy clusters at z ∼ 1.2 in the SpARCS-north Cluster Survey.

MUZZIN A., WILSON G., YEE H.K.C., HOEKSTRA H., GILBANK D., SURACE J., LACY M., BLINDERT K., MAJUMDAR S., DEMARCO R., GARDNER J.P., GLADDERS M. and LONSDALE C.

Abstract (from CDS):

The Spitzer Adaptation of the Red-sequence Cluster Survey (SpARCS) is a deep z'-band imaging survey covering the Spitzer Wide-Area Infrared Extragalactic Survey (SWIRE) Legacy fields designed to create the first large homogeneously selected sample of massive clusters at z > 1 using an infrared adaptation of the cluster red-sequence method. We present an overview of the northern component of the survey which has been observed with Canada-France-Hawaii Telescope (CFHT)/MegaCam and covers 28.3 deg2. The southern component of the survey was observed with Cerro Tololo Inter-American Observatory (CTIO)/MOSAICII, covers 13.6 deg2, and is summarized in a companion paper by Wilson et al. We also present spectroscopic confirmation of two rich cluster candidates at z ∼ 1.2. Based on Nod-and-Shuffle spectroscopy from GMOS-N on Gemini, there are 17 and 28 confirmed cluster members in SpARCS J163435+402151 and SpARCS J163852+403843 which have spectroscopic redshifts of 1.1798 and 1.1963, respectively. The clusters have velocity dispersions of 490±140 km/s and 650±160 km/s, respectively, which imply masses (M200) of (1.0 ±0.9)x1014 M☉ and (2.4±1.8)x1014 M☉. Confirmation of these candidates as bonafide massive clusters demonstrates that two-filter imaging is an effective, yet observationally efficient, method for selecting clusters at z > 1.

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Journal keyword(s): infrared: galaxies

Nomenclature: Text: SpARCS JHHMMSS+DDMMSS N=2. Tables 1-4: SpARCS JHHMM.m+DDMM mN NNNN N=29+44.

Simbad objects: 82

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Number of rows : 82
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 ELAIS S1 reg 00 34 44 -43 28.2           ~ 205 0
2 NAME XMM-LSS Field reg 02 18 00 -07 00.0           ~ 262 0
3 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 2088 1
4 NAME Lockman Hole reg 10 45 00.0 +58 00 00           ~ 841 0
5 ELAIS N1 reg 16 10 01 +54 30.6           ~ 422 0
6 SpARCS J1634.5+4021 m2 20 GiC 16 34 23.8 +40 20 55           ~ 1 0
7 SpARCS J1634.5+4021 m2 23 G 16 34 24.7 +40 20 17           ~ 1 0
8 SpARCS J1634.5+4021 m1 31 G 16 34 25.0 +40 21 44           ~ 1 0
9 SpARCS J1634.5+4021 m2 24 G 16 34 25.7 +40 20 15           ~ 1 0
10 SpARCS J1634.5+4021 m1 4 G 16 34 27.1 +40 21 22           ~ 1 0
11 SpARCS J1634.5+4021 m2 36 GiC 16 34 28.1 +40 21 59           ~ 1 0
12 SpARCS J1634.5+4021 m3 67 G 16 34 32.0 +40 23 16           ~ 1 0
13 SpARCS J1634.5+4021 m1 45 GiC 16 34 34.6 +40 22 27           ~ 1 0
14 SpARCS J163437+402149 ClG 16 34 35.0 +40 21 51           ~ 23 0
15 SpARCS J1634.5+4021 m1 41 GiC 16 34 35.0 +40 22 06           ~ 1 0
16 SpARCS J1634.5+4021 m1 6 GiC 16 34 35.2 +40 21 51           ~ 1 0
17 SpARCS J1634.5+4021 m3 38 GiC 16 34 35.4 +40 21 41           ~ 1 0
18 SpARCS J1634.5+4021 m1 5 GiC 16 34 35.9 +40 21 41           ~ 1 0
19 SpARCS J1634.5+4021 m1 37 GiC 16 34 35.9 +40 22 01           ~ 1 0
20 SpARCS J1634.5+4021 m1 25 GiC 16 34 36.2 +40 21 31           ~ 1 0
21 SpARCS J1634.5+4021 m1 21 GiC 16 34 36.3 +40 21 09           ~ 1 0
22 SpARCS J1634.5+4021 m1 34 GiC 16 34 36.6 +40 21 53           ~ 1 0
23 SpARCS J1634.5+4021 m1 3027 GiC 16 34 37.1 +40 21 17           ~ 1 0
24 SpARCS J1634.5+4021 m2 27 GiC 16 34 37.2 +40 21 04           ~ 1 0
25 SpARCS J1634.5+4021 m3 15 G 16 34 37.8 +40 19 55           ~ 1 0
26 SpARCS J1634.5+4021 m3 2 GiC 16 34 38.0 +40 20 58           ~ 1 0
27 SpARCS J1634.5+4021 m1 3 GiC 16 34 38.1 +40 21 11           ~ 1 0
28 SpARCS J1634.5+4021 m1 26 G 16 34 38.4 +40 21 32           ~ 1 0
29 SpARCS J1634.5+4021 m1 22 GiC 16 34 38.5 +40 21 17           ~ 1 0
30 SpARCS J1634.5+4021 m1 28 GiC 16 34 38.5 +40 21 41           ~ 1 0
31 SpARCS J1634.5+4021 m3 69 GiC 16 34 40.1 +40 23 29           ~ 1 0
32 SpARCS J1634.5+4021 m2 57 GiC 16 34 40.8 +40 23 30           ~ 1 0
33 SpARCS J1634.5+4021 m3 1 G 16 34 41.5 +40 19 57           ~ 1 0
34 SpARCS J1634.5+4021 m3 65 G 16 34 43.0 +40 23 09           ~ 1 0
35 NAME SpARCS J1634.5+4021 m1 45 Bg G 16 34 43.8 +40 23 13           ~ 1 0
36 ELAIS N2 reg 16 36 48.0 +41 01 45           ~ 167 0
37 SpARCS J1638.8+4039 m3 3036 G 16 38 38.5 +40 39 29           ~ 1 0
38 SpARCS J1638.8+4039 m2 2016 GiC 16 38 38.6 +40 39 35           ~ 1 0
39 SpARCS J1638.8+4039 m1 3026 GiC 16 38 40.0 +40 38 39           ~ 1 0
40 SpARCS J1638.8+4039 m4 13 GiC 16 38 40.3 +40 40 15           ~ 1 0
41 SpARCS J1638.8+4039 m4 2026 G 16 38 41.9 +40 40 39           ~ 1 0
42 SpARCS J1638.8+4039 m4 2003 G 16 38 42.4 +40 36 15           ~ 1 0
43 SpARCS J1638.8+4039 m4 2 GiC 16 38 46.7 +40 36 55           ~ 1 0
44 SpARCS J1638.8+4039 m3 3034 G 16 38 46.9 +40 39 10           ~ 1 0
45 SpARCS J1638.8+4039 m1 1007 GiC 16 38 47.4 +40 38 02           ~ 1 0
46 SpARCS J1638.8+4039 m4 3 GiC 16 38 47.7 +40 37 28           ~ 1 0
47 SpARCS J1638.8+4039 m4 1012 GiC 16 38 47.8 +40 38 23           ~ 1 0
48 SpARCS J1638.8+4039 m4 12 G 16 38 47.8 +40 40 05           ~ 1 0
49 SpARCS J1638.8+4039 m1 1016 GiC 16 38 48.1 +40 38 34           ~ 1 0
50 SpARCS J1638.8+4039 m1 1031 GiC 16 38 48.7 +40 39 35           ~ 1 0
51 SpARCS J1638.8+4039 m2 1018 GiC 16 38 48.8 +40 38 43           ~ 1 0
52 SpARCS J1638.8+4039 m4 2030 GiC 16 38 49.2 +40 41 18           ~ 1 0
53 SpARCS J1638.8+4039 m2 1020 GiC 16 38 50.4 +40 38 47           ~ 1 0
54 SpARCS J1638.8+4039 m1 1028 GiC 16 38 50.5 +40 39 19           ~ 1 0
55 SpARCS J1638.8+4039 m2 1026 GiC 16 38 51.0 +40 39 11           ~ 1 0
56 SpARCS J1638.8+4039 m1 5 GiC 16 38 51.2 +40 38 22           ~ 1 0
57 SpARCS J1638.8+4039 m2 1024 GiC 16 38 51.2 +40 38 54           ~ 1 0
58 SpARCS J1638.8+4039 m3 1017 GiC 16 38 51.3 +40 38 42           ~ 1 0
59 SpARCS J1638.8+4039 m1 1025 GiC 16 38 51.3 +40 38 58           ~ 1 0
60 SpARCS J1638.8+4039 m1 7 GiC 16 38 51.5 +40 38 30           ~ 1 0
61 SpARCS J1638.8+4039 m1 1010 GiC 16 38 51.6 +40 38 17           ~ 1 0
62 SpARCS J1638.8+4039 m1 8 GiC 16 38 51.6 +40 38 43           ~ 1 0
63 SpARCS J1638.8+4039 m3 1019 GiC 16 38 51.9 +40 38 46           ~ 1 0
64 SpARCS J163852+403843 ClG 16 38 52.0 +40 38 43           ~ 25 0
65 SpARCS J1638.8+4039 m4 3019 GiC 16 38 52.5 +40 38 00           ~ 1 0
66 SpARCS J1638.8+4039 m4 1021 GiC 16 38 53.2 +40 38 47           ~ 1 0
67 SpARCS J1638.8+4039 m3 2009 GiC 16 38 53.7 +40 37 54           ~ 1 0
68 SpARCS J1638.8+4039 m2 4020 G 16 38 55.3 +40 38 20           ~ 1 0
69 SpARCS J1638.8+4039 m4 10 GiC 16 38 55.5 +40 39 40           ~ 1 0
70 SpARCS J1638.8+4039 m4 1 G 16 38 55.7 +40 36 33           ~ 1 0
71 SpARCS J1638.8+4039 m4 11 GiC 16 38 57.1 +40 39 53           ~ 1 0
72 SpARCS J1638.8+4039 m4 2024 G 16 38 59.9 +40 40 21           ~ 1 0
73 SpARCS J1638.8+4039 m2 3024 G 16 39 00.1 +40 38 28           ~ 1 0
74 SpARCS J1638.8+4039 m4 3046 GiC 16 39 00.2 +40 41 02           ~ 1 0
75 SpARCS J1638.8+4039 m4 3004 G 16 39 00.5 +40 36 24           ~ 1 0
76 SpARCS J1638.8+4039 m4 2014 GiC 16 39 00.8 +40 38 57           ~ 1 0
77 SpARCS J1638.8+4039 m2 1030 GiC 16 39 01.9 +40 38 11           ~ 1 0
78 SpARCS J1638.8+4039 m4 3041 G 16 39 02.7 +40 40 13           ~ 1 0
79 SpARCS J1638.8+4039 m3 4029 GiC 16 39 02.9 +40 39 18           ~ 1 0
80 SpARCS J1638.8+4039 m1 3021 G 16 39 03.8 +40 38 06           ~ 1 0
81 SpARCS J1638.8+4039 m2 4030 G 16 39 04.0 +40 39 20           ~ 1 0
82 LAWD 74 WD* 19 20 34.9229289504 -07 40 00.065957592 11.553 12.345 12.290 12.229 12.164 DBQA5 230 0

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