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.

Abstract Copyright: ∼

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

Full paper

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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 - 2023	#notes
1	ELAIS S1	reg	00 34 44	-43 28.2						~	187	0
2	NAME XMM-LSS Field	reg	02 18 00	-07 00.0						~	231	0
3	NAME Chandra Deep Field-South	reg	03 32 28.0	-27 48 30						~	2017	1
4	NAME Lockman Hole	reg	10 45 00.0	+58 00 00						~	815	0
5	ELAIS N1	reg	16 10 01	+54 30.6						~	384	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 J163435+402151	ClG	16 34 35.0	+40 21 51						~	17	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						~	165	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	220	0

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