2005ApJ...625....6G

Query : 2005ApJ...625....6G

2005ApJ...625....6G - Astrophys. J., 625, 6-22 (2005/May-3)

The DEEP2 Galaxy Redshift Survey: first results on galaxy groups.

GERKE B.F., NEWMAN J.A., DAVIS M., MARINONI C., YAN R., COIL A.L., CONROY C., COOPER M.C., FABER S.M., FINKBEINER D.P., GUHATHAKURTA P., KAISER N., KOO D.C., PHILLIPS A.C., WEINER B.J. and WILLMER C.N.A.

Abstract (from CDS):

We use the first 25% of the DEEP2 Galaxy Redshift Survey spectroscopic data to identify groups and clusters of galaxies in redshift space. The data set contains 8370 galaxies with confirmed redshifts in the range 0.7≤z≤1.4, over 1 deg2 on the sky. Groups are identified using an algorithm (the Voronoi-Delaunay method) that has been shown to accurately reproduce the statistics of groups in simulated DEEP2-like samples. We optimize this algorithm for the DEEP2 survey by applying it to realistic mock galaxy catalogs and assessing the results using a stringent set of criteria for measuring group-finding success, which we develop and describe in detail here. We find in particular that the group finder can successfully identify ∼78% of real groups and that ∼79% of the galaxies that are true members of groups can be identified as such. Conversely, we estimate that ∼55% of the groups we find can be definitively identified with real groups and that ∼46% of the galaxies we place into groups are interloper field galaxies. Most importantly, we find that it is possible to measure the distribution of groups in redshift and velocity dispersion, n(σ,z), to an accuracy limited by cosmic variance, for dispersions greater than 350 km/s. We anticipate that such measurements will allow strong constraints to be placed on the equation of state of the dark energy in the future. Finally, we present the first DEEP2 group catalog, which assigns 32% of the galaxies to 899 distinct groups with two or more members, 153 of which have velocity dispersions above 350 km/s. We provide locations, redshifts and properties for this high-dispersion subsample. This catalog represents the largest sample to date of spectroscopically detected groups at z∼1.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Clusters: General - Galaxies: High-Redshift

VizieR on-line data: <Available at CDS (J/ApJ/625/6): table3.dat>

Nomenclature: Table 3: [GND2005] JHHMMSS+DDMMSS N=153.

Simbad objects: 154

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Number of rows : 154
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 [GND2005] J022838+003021 GrG 02 28 38 +00 30.4           ~ 1 0
2 [GND2005] J022841+003826 GrG 02 28 41 +00 38.4           ~ 1 0
3 [GND2005] J022842+002656 GrG 02 28 42 +00 26.9           ~ 1 0
4 [GND2005] J022844+004701 GrG 02 28 44 +00 47.0           ~ 1 0
5 [GND2005] J022847+003651 GrG 02 28 47 +00 36.9           ~ 1 0
6 [GND2005] J022850+003855 GrG 02 28 50 +00 38.9           ~ 1 0
7 [GND2005] J022851+003336 GrG 02 28 51 +00 33.6           ~ 1 0
8 [GND2005] J022858+004043 GrG 02 28 58 +00 40.7           ~ 1 0
9 [GND2005] J022858+004417 GrG 02 28 58 +00 44.3           ~ 1 0
10 [GND2005] J022858+002732 GrG 02 28 58.27 +00 27 32.5           ~ 2 0
11 [GND2005] J022904+003008 GrG 02 29 04 +00 30.1           ~ 1 0
12 [GND2005] J022906+003445 GrG 02 29 06 +00 34.7           ~ 1 0
13 [GND2005] J022913+002902 GrG 02 29 13 +00 29.0           ~ 1 0
14 [GND2005] J022916+003108 GrG 02 29 16 +00 31.1           ~ 1 0
15 [GND2005] J022918+002536 GrG 02 29 18 +00 25.6           ~ 1 0
16 [GND2005] J022920+002451 Gr? 02 29 20.19 +00 24 51.3           ~ 2 0
17 [GND2005] J022924+004217 Gr? 02 29 24.71 +00 42 18.0           ~ 2 0
18 [GND2005] J022926+004749 GrG 02 29 26 +00 47.8           ~ 1 0
19 [GND2005] J022927+002857 GrG 02 29 27 +00 29.0           ~ 1 0
20 [GND2005] J022931+003047 GrG 02 29 31 +00 30.8           ~ 1 0
21 [GND2005] J022931+003654 GrG 02 29 31 +00 36.9           ~ 1 0
22 [GND2005] J022936+003236 Gr? 02 29 36.24 +00 32 36.2           ~ 2 0
23 [GND2005] J022937+003012 GrG 02 29 37 +00 30.2           ~ 1 0
24 [GND2005] J022946+003102 GrG 02 29 46 +00 31.0           ~ 1 0
25 [GND2005] J022949+003014 GrG 02 29 49 +00 30.2           ~ 1 0
26 [GND2005] J022953+003404 GrG 02 29 53 +00 34.1           ~ 1 0
27 [GND2005] J022953+004324 GrG 02 29 53.31 +00 43 24.8           ~ 2 0
28 [GND2005] J022956+003629 GrG 02 29 56 +00 36.5           ~ 1 0
29 [GND2005] J022957+003232 GrG 02 29 57 +00 32.5           ~ 1 0
30 [GND2005] J022959+002145 GrG 02 29 59 +00 21.8           ~ 1 0
31 [GND2005] J023005+004548 GrG 02 30 05 +00 45.8           ~ 1 0
32 [GND2005] J023006+003404 GrG 02 30 06 +00 34.1           ~ 1 0
33 [GND2005] J023006+003624 GrG 02 30 06 +00 36.4           ~ 1 0
34 [GND2005] J023015+004612 GrG 02 30 15 +00 46.2           ~ 1 0
35 [GND2005] J023015+004135 GrG 02 30 15 +00 41.6           ~ 1 0
36 [GND2005] J023016+004852 GrG 02 30 16 +00 48.9           ~ 1 0
37 [GND2005] J023021+002643 GrG 02 30 20.51 +00 26 36.6           ~ 3 0
38 [GND2005] J023025+003740 GrG 02 30 25 +00 37.7           ~ 1 0
39 [GND2005] J023029+003455 GrG 02 30 29 +00 34.9           ~ 1 0
40 [GND2005] J023033+002720 Gr? 02 30 32.61 +00 27 10.2           ~ 2 0
41 [GND2005] J023037+004148 GrG 02 30 37 +00 41.8           ~ 1 0
42 [GND2005] J023037+004514 GrG 02 30 37.18 +00 45 14.4           ~ 2 0
43 [GND2005] J023039+004322 Gr? 02 30 39.22 +00 43 22.6           ~ 2 0
44 [GND2005] J023041+002812 Gr? 02 30 41.40 +00 28 12.3           ~ 2 0
45 [GND2005] J023044+004448 GrG 02 30 44.42 +00 44 39.7           ~ 2 0
46 [GND2005] J023059+003711 GrG 02 30 59 +00 37.2           ~ 1 0
47 [GND2005] J023100+003405 GrG 02 31 00 +00 34.1           ~ 1 0
48 [GND2005] J023102+003629 GrG 02 31 02 +00 36.5           ~ 1 0
49 [GND2005] J023103+004333 GrG 02 31 03 +00 43.6           ~ 1 0
50 [GND2005] J023112+002942 GrG 02 31 12 +00 29.7           ~ 1 0
51 [GND2005] J023112+004237 GrG 02 31 12 +00 42.6           ~ 1 0
52 [GND2005] J023113+003425 Gr? 02 31 12.69 +00 34 33.3           ~ 3 0
53 [GND2005] J023120+003220 GrG 02 31 20 +00 32.3           ~ 1 0
54 [GND2005] J023121+003515 GrG 02 31 21 +00 35.3           ~ 1 0
55 [GND2005] J023123+003416 GrG 02 31 23 +00 34.3           ~ 1 0
56 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
57 [GND2005] J164948+345136 GrG 16 49 48 +34 51.6           ~ 1 0
58 [GND2005] J164948+350923 GrG 16 49 48 +35 09.4           ~ 1 0
59 [GND2005] J164951+345016 GrG 16 49 51 +34 50.3           ~ 1 0
60 [GND2005] J164952+350553 GrG 16 49 52.53 +35 05 53.6           ~ 2 0
61 [GND2005] J164953+350645 GrG 16 49 53 +35 06.8           ~ 1 0
62 [GND2005] J164953+350843 GrG 16 49 53 +35 08.7           ~ 1 0
63 [GND2005] J164954+350943 GrG 16 49 54 +35 09.7           ~ 1 0
64 [GND2005] J164958+350049 GrG 16 49 58 +35 00.8           ~ 1 0
65 [GND2005] J164959+345014 GrG 16 49 59 +34 50.2           ~ 1 0
66 [GND2005] J165002+350537 GrG 16 50 02 +35 05.6           ~ 1 0
67 [GND2005] J165002+344737 GrG 16 50 02.55 +34 47 37.8           ~ 2 0
68 [GND2005] J165004+350823 GrG 16 50 04 +35 08.4           ~ 1 0
69 [GND2005] J165018+344806 GrG 16 50 18 +34 48.1           ~ 1 0
70 [GND2005] J165021+350136 GrG 16 50 21.61 +35 01 36.7           ~ 2 0
71 [GND2005] J165026+350828 GrG 16 50 26.25 +35 08 28.9           ~ 2 0
72 [GND2005] J165029+344347 GrG 16 50 29 +34 43.8           ~ 1 0
73 [GND2005] J165034+350502 GrG 16 50 34 +35 05.0           ~ 1 0
74 [GND2005] J165036+344910 GrG 16 50 36 +34 49.2           ~ 1 0
75 [GND2005] J165038+344557 GrG 16 50 38 +34 45.9           ~ 1 0
76 [GND2005] J165056+345848 GrG 16 50 56 +34 58.8           ~ 1 0
77 [GND2005] J165059+345028 Gr? 16 50 59.36 +34 50 37.8           ~ 2 0
78 [GND2005] J165102+345931 GrG 16 51 02 +34 59.5           ~ 1 0
79 [GND2005] J165115+345102 GrG 16 51 15 +34 51.0           ~ 1 0
80 [GND2005] J165115+345315 GrG 16 51 15.36 +34 53 19.0           ~ 2 0
81 [GND2005] J165126+345726 GrG 16 51 26 +34 57.4           ~ 1 0
82 [GND2005] J165131+345527 GrG 16 51 31 +34 55.4           ~ 1 0
83 [GND2005] J165135+344902 GrG 16 51 35 +34 49.0           ~ 1 0
84 [GND2005] J165135+345635 GrG 16 51 35 +34 56.6           ~ 1 0
85 [GND2005] J165149+345114 GrG 16 51 48.63 +34 51 11.2           ~ 3 0
86 [GND2005] J165154+345234 GrG 16 51 54 +34 52.6           ~ 1 0
87 [GND2005] J165158+350809 GrG 16 51 58 +35 08.1           ~ 1 0
88 [GND2005] J165204+345209 GrG 16 52 04 +34 52.1           ~ 1 0
89 [GND2005] J165208+350222 GrG 16 52 08 +35 02.4           ~ 1 0
90 [GND2005] J165210+350341 GrG 16 52 10 +35 03.7           ~ 1 0
91 [GND2005] J165212+350527 GrG 16 52 12 +35 05.5           ~ 1 0
92 [GND2005] J165213+345759 GrG 16 52 13.32 +34 57 59.8           ~ 2 0
93 [GND2005] J165216+350920 GrG 16 52 16 +35 09.3           ~ 1 0
94 [GND2005] J165220+350753 GrG 16 52 20 +35 07.9           ~ 1 0
95 [GND2005] J165222+344954 GrG 16 52 22.14 +34 49 57.1           ~ 2 0
96 [GND2005] J165225+351037 GrG 16 52 25 +35 10.6           ~ 1 0
97 [GND2005] J165225+345714 GrG 16 52 25 +34 57.2           ~ 1 0
98 [GND2005] J165226+344606 GrG 16 52 26 +34 46.1           ~ 1 0
99 [GND2005] J165227+344959 GrG 16 52 27 +34 50.0           ~ 1 0
100 [GND2005] J165228+345133 GrG 16 52 28.49 +34 51 33.8           ~ 2 0
101 [GND2005] J165248+350430 GrG 16 52 48 +35 04.5           ~ 1 0
102 [GND2005] J165249+345954 GrG 16 52 49 +34 59.9           ~ 1 0
103 [GND2005] J165250+345224 GrG 16 52 50.72 +34 52 24.2           ~ 2 0
104 [GND2005] J165253+345535 GrG 16 52 53 +34 55.6           ~ 1 0
105 [GND2005] J165258+350224 GrG 16 52 58 +35 02.4           ~ 1 0
106 [GND2005] J165308+350003 GrG 16 53 08.87 +34 59 57.0           ~ 2 0
107 [GND2005] J165309+350021 GrG 16 53 09.44 +35 00 17.5           ~ 2 0
108 [GND2005] J165310+345912 GrG 16 53 10 +34 59.2           ~ 1 0
109 [GND2005] J232832+001650 GrG 23 28 32 +00 16.8           ~ 1 0
110 [GND2005] J232836+001840 GrG 23 28 36 +00 18.7           ~ 1 0
111 [GND2005] J232840+002409 GrG 23 28 40 +00 24.2           ~ 1 0
112 [GND2005] J232840+001257 GrG 23 28 40.55 +00 12 57.9           ~ 2 0
113 [GND2005] J232843+000632 Gr? 23 28 43.67 +00 06 32.7           ~ 2 0
114 [GND2005] J232850+000213 GrG 23 28 50.66 +00 02 13.8           ~ 2 0
115 [GND2005] J232851+002413 GrG 23 28 51 +00 24.2           ~ 1 0
116 [GND2005] J232851+000140 Gr? 23 28 51.25 +00 01 40.9           ~ 2 0
117 [GND2005] J232903+001745 GrG 23 29 03 +00 17.7           ~ 1 0
118 [GND2005] J232906+000527 GrG 23 29 06 +00 05.5           ~ 1 0
119 [GND2005] J232914+001604 GrG 23 29 14 +00 16.1           ~ 1 0
120 [GND2005] J232914+001103 Gr? 23 29 14.27 +00 11 09.8           ~ 2 0
121 [GND2005] J232914-000017 Gr? 23 29 14.58 -00 00 17.1           ~ 2 0
122 [GND2005] J232919+000412 GrG 23 29 19 +00 04.2           ~ 1 0
123 [GND2005] J232937+000040 GrG 23 29 37 +00 00.7           ~ 1 0
124 [GND2005] J232941+001502 Gr? 23 29 41.23 +00 15 02.8           ~ 2 0
125 [GND2005] J232942+001858 GrG 23 29 42 +00 19.0           ~ 1 0
126 [GND2005] J232949+000036 GrG 23 29 49 +00 00.6           ~ 1 0
127 [GND2005] J232949+001012 GrG 23 29 49 +00 10.2           ~ 1 0
128 [GND2005] J232949+001711 GrG 23 29 49 +00 17.2           ~ 1 0
129 [GND2005] J232949+001800 GrG 23 29 49.74 +00 18 00.2           ~ 2 0
130 [GND2005] J232958+000845 GrG 23 29 58 +00 08.8           ~ 1 0
131 [GND2005] J233001-000042 GrG 23 30 01 -00 00.7           ~ 1 0
132 [GND2005] J233002+001053 GrG 23 30 02.14 +00 10 53.1           ~ 2 0
133 [GND2005] J233013+002406 GrG 23 30 13 +00 24.1           ~ 1 0
134 [GND2005] J233014-000011 GrG 23 30 14 -00 00.2           ~ 1 0
135 [GND2005] J233014+000344 GrG 23 30 14 +00 03.7           ~ 1 0
136 [GND2005] J233022+000452 GrG 23 30 22 +00 04.9           ~ 1 0
137 [GND2005] J233030+000321 Gr? 23 30 30.32 +00 03 29.5           ~ 2 0
138 [GND2005] J233033+000603 GrG 23 30 33 +00 06.1           ~ 1 0
139 [GND2005] J233035+000943 GrG 23 30 35 +00 09.7           ~ 1 0
140 [GND2005] J233036+000405 Gr? 23 30 36.04 +00 04 05.2           ~ 2 0
141 [GND2005] J233040+000240 GrG 23 30 40 +00 02.7           ~ 1 0
142 [GND2005] J233043-000058 GrG 23 30 43 -00 01.0           ~ 1 0
143 [GND2005] J233051+001200 GrG 23 30 51 +00 12.0           ~ 1 0
144 [GND2005] J233054+002100 GrG 23 30 54 +00 21.0           ~ 1 0
145 [GND2005] J233056+000542 GrG 23 30 56 +00 05.7           ~ 1 0
146 [GND2005] J233057-000037 GrG 23 30 57 -00 00.6           ~ 1 0
147 [GND2005] J233057+002119 GrG 23 30 57 +00 21.3           ~ 1 0
148 [GND2005] J233100+001750 GrG 23 31 00 +00 17.8           ~ 1 0
149 [GND2005] J233102+001243 GrG 23 31 02 +00 12.7           ~ 1 0
150 [GND2005] J233102+000124 Gr? 23 31 02.02 +00 01 24.5           ~ 2 0
151 [GND2005] J233103+000507 GrG 23 31 03 +00 05.1           ~ 1 0
152 [GND2005] J233103+002021 GrG 23 31 03 +00 20.4           ~ 1 0
153 [GND2005] J233105+001650 GrG 23 31 04.74 +00 16 46.4           ~ 2 0
154 [GND2005] J233105+001053 GrG 23 31 05 +00 10.9           ~ 1 0

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