2006ApJ...646..133M

Query : 2006ApJ...646..133M

2006ApJ...646..133M - Astrophys. J., 646, 133-142 (2006/July-3)

X-ray-selected intermediate-redshift groups of galaxies.

MULCHAEY J.S., LUBIN L.M., FASSNACHT C., ROSATI P. and JELTEMA T.E.

Abstract (from CDS):

We present spectroscopic confirmation of nine moderate-redshift galaxy groups and poor clusters selected from the ROSAT Deep Cluster Survey. The groups span the redshift range z∼0.23-0.59 and have between 4 and 20 confirmed members. The velocity dispersions of these groups range from ∼125 to 650 km.s–1. Similar to X-ray groups at low redshift, these systems contain a significant number of early-type galaxies. Therefore, the trend for X-ray-luminous groups to have high early-type fractions is already in place by at least z∼0.5. In four of the nine groups, the X-ray emission is clearly peaked on the most luminous early-type galaxy in the group. However, in several cases the central galaxy is composed of multiple luminous nuclei, suggesting that the brightest group galaxy may still be undergoing major mergers. In at least three (and possibly five) of the groups in our sample, a dominant early-type galaxy is not found at the center of the group potential. This suggests that many of our groups are not dynamically evolved despite their high X-ray luminosities. While similar systems have been identified at low redshift, the X-ray luminosities of the intermediate-redshift examples are 1-3 orders of magnitude higher than those of their low-redshift counterparts. We suggest that this may be evidence for group downsizing: while massive groups are still in the process of collapsing and virializing at intermediate redshifts, only low-mass groups are in the process of forming at the present day.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Clusters: General - Galaxies: Elliptical and Lenticular, cD - Galaxies: Evolution

VizieR on-line data: <Available at CDS (J/ApJ/646/133): table1.dat>

Nomenclature: Table 1: [MLF2006] JHHMMSS.ss+DDMMSS.s N=169.

Simbad objects: 180

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Number of rows : 180
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 [MLF2006] J021009.90-392638.7 G 02 10 09.90 -39 26 38.7       17.1   ~ 1 0
2 [MLF2006] J021010.78-392019.3 G 02 10 10.78 -39 20 19.3       19.1   ~ 1 0
3 LEDA 596915 G 02 10 13.2 -39 32 59       17.1   ~ 2 0
4 [MLF2006] J021014.40-392651.9 G 02 10 14.40 -39 26 51.9       19.9   ~ 1 0
5 [MLF2006] J021014.98-393242.6 G 02 10 14.98 -39 32 42.6       17.8   ~ 1 0
6 [MLF2006] J021021.10-393242.5 G 02 10 21.10 -39 32 42.5       18.8   ~ 1 0
7 [MLF2006] J021021.71-392011.3 G 02 10 21.71 -39 20 11.3       19.2   ~ 1 0
8 [MLF2006] J021024.52-392939.4 G 02 10 24.52 -39 29 39.4       19.2   ~ 1 0
9 [MLF2006] J021025.53-392952.3 G 02 10 25.53 -39 29 52.3       17.8   ~ 1 0
10 BAX 032.6067-39.4964 ClG 02 10 25.6 -39 29 47           ~ 15 0
11 [MLF2006] J021025.96-392943.7 G 02 10 25.96 -39 29 43.7       18.1   ~ 1 0
12 [MLF2006] J021027.17-392930.2 G 02 10 27.17 -39 29 30.2       18.7   ~ 1 0
13 [MLF2006] J021027.46-392932.2 G 02 10 27.46 -39 29 32.2       18.6   ~ 1 0
14 [MLF2006] J021029.40-392029.7 G 02 10 29.40 -39 20 29.7       18.9   ~ 1 0
15 [MLF2006] J021030.54-392857.8 G 02 10 30.54 -39 28 57.8       19.8   ~ 1 0
16 [MLF2006] J021031.98-392836.8 G 02 10 31.98 -39 28 36.8       20.2   ~ 1 0
17 [MLF2006] J021033.52-392933.9 G 02 10 33.52 -39 29 33.9       18.3   ~ 1 0
18 [MLF2006] J021033.79-392958.8 G 02 10 33.79 -39 29 58.8       18.9   ~ 1 0
19 [MLF2006] J021035.88-392907.1 G 02 10 35.88 -39 29 07.1       20.1   ~ 1 0
20 [MLF2006] J021042.53-392003.8 G 02 10 42.53 -39 20 03.8       20.8   ~ 1 0
21 [MLF2006] J032858.71+025734.7 G 03 28 58.71 +02 57 34.7       21.4   ~ 1 0
22 [MLF2006] J032858.82+025756.0 G 03 28 58.82 +02 57 56.0       20.43   ~ 2 0
23 [MLF2006] J032859.90+025859.6 G 03 28 59.90 +02 58 59.6       20.6   ~ 1 0
24 [MLF2006] J032901.25+025710.5 G 03 29 01.25 +02 57 10.5       20.57   ~ 2 0
25 [MLF2006] J032901.62+025927.7 G 03 29 01.62 +02 59 27.7       21.2   ~ 1 0
26 [MLF2006] J032901.62+025324.8 G 03 29 01.62 +02 53 24.8       21.5   ~ 1 0
27 [MLF2006] J032901.65+025915.6 G 03 29 01.65 +02 59 15.6       19.39   ~ 2 0
28 [MLF2006] J032901.73+025748.3 G 03 29 01.73 +02 57 48.3       20.93   ~ 2 0
29 [MLF2006] J032902.29+025612.6 G 03 29 02.29 +02 56 12.6       20.68   ~ 2 0
30 [MLF2006] J032902.29+025625.2 G 03 29 02.29 +02 56 25.2       20.32   ~ 2 0
31 [MLF2006] J032902.37+025450.0 G 03 29 02.37 +02 54 50.0       20.76   ~ 2 0
32 ClG J0329+0256 GrG 03 29 02.8 +02 56 23           ~ 14 0
33 [MLF2006] J032902.82+025621.8 G 03 29 02.82 +02 56 21.8       18.97   ~ 2 0
34 [MLF2006] J032903.52+025615.5 G 03 29 03.52 +02 56 15.5       20.48   ~ 2 0
35 [MLF2006] J032904.58+025725.6 G 03 29 04.58 +02 57 25.6       20.79   ~ 2 0
36 [MLF2006] J032904.63+025540.8 G 03 29 04.63 +02 55 40.8       20.30   ~ 2 0
37 [MLF2006] J032905.57+025700.5 G 03 29 05.57 +02 57 00.5       20.83   ~ 2 0
38 [MLF2006] J032905.68+025540.4 G 03 29 05.68 +02 55 40.4       21.2   ~ 1 0
39 [MLF2006] J032905.80+025413.1 G 03 29 05.80 +02 54 13.1       21.83   ~ 2 0
40 [MLF2006] J032905.97+025709.2 G 03 29 05.97 +02 57 09.2       20.54   ~ 2 0
41 [MLF2006] J032906.32+025455.1 G 03 29 06.32 +02 54 55.1       20.13   ~ 2 0
42 [MLF2006] J032907.10+025519.1 G 03 29 07.10 +02 55 19.1       22.3   ~ 1 0
43 [MLF2006] J032907.35+025516.5 G 03 29 07.35 +02 55 16.5       20.63   ~ 2 0
44 [MLF2006] J032907.39+025423.4 G 03 29 07.39 +02 54 23.4       21.21   ~ 2 0
45 [MLF2006] J032907.93+025335.6 G 03 29 07.93 +02 53 35.6       20.46   ~ 2 0
46 [MLF2006] J032908.00+025834.7 G 03 29 08.00 +02 58 34.7       20.84   ~ 2 0
47 [MLF2006] J034138.15-450103.7 G 03 41 38.15 -45 01 03.7       20.0   ~ 1 0
48 [MLF2006] J034140.70-445623.9 G 03 41 40.70 -44 56 23.9       19.8   ~ 1 0
49 [MLF2006] J034141.27-450007.2 G 03 41 41.27 -45 00 07.2       19.7   ~ 1 0
50 [MLF2006] J034143.74-450231.5 G 03 41 43.74 -45 02 31.5       19.5   ~ 2 0
51 [MLF2006] J034145.70-450152.6 G 03 41 45.70 -45 01 52.6       20.4   ~ 1 0
52 [MLF2006] J034147.52-450002.5 G 03 41 47.52 -45 00 02.5       18.6   ~ 1 0
53 QSO B0340-451 QSO 03 41 49.1034016536 -45 00 47.855666988   19.57 19.78 18.9   ~ 7 0
54 [MLF2006] J034150.64-450010.5 G 03 41 50.64 -45 00 10.5       19.4   ~ 1 0
55 [MLF2006] J034154.37-445702.5 G 03 41 54.37 -44 57 02.5       19.9   ~ 1 0
56 [MLF2006] J034154.82-445846.7 G 03 41 54.82 -44 58 46.7       20.8   ~ 1 0
57 BAX 055.4879-45.0031 ClG 03 41 57.1 -45 00 11           ~ 9 0
58 [MLF2006] J034158.28-445753.5 G 03 41 58.28 -44 57 53.5       20.2   ~ 1 0
59 [MLF2006] J034158.65-445938.3 G 03 41 58.65 -44 59 38.3       18.7   ~ 1 0
60 [MLF2006] J034201.11-445958.5 G 03 42 01.11 -44 59 58.5       20.6   ~ 1 0
61 [MLF2006] J034204.93-445953.2 G 03 42 04.81 -44 59 53.5       18.0   ~ 2 0
62 [MLF2006] J034207.44-445853.6 G 03 42 07.44 -44 58 53.6       19.3   ~ 1 0
63 [MLF2006] J072016.53+710942.6 G 07 20 16.53 +71 09 42.6       22.83   ~ 2 0
64 [MLF2006] J072032.62+710855.9 G 07 20 32.62 +71 08 55.9       22.12   ~ 2 0
65 [MLF2006] J072039.75+710950.8 G 07 20 39.75 +71 09 50.8           ~ 2 0
66 [MLF2006] J072040.23+710842.8 G 07 20 40.23 +71 08 42.8           ~ 2 0
67 [MLF2006] J072044.19+710854.1 G 07 20 44.19 +71 08 54.1       21.83   ~ 2 0
68 [MLF2006] J072044.89+710845.5 G 07 20 44.89 +71 08 45.5       19.58   ~ 2 0
69 [MLF2006] J072046.75+710904.4 G 07 20 46.75 +71 09 04.4       22.56   ~ 2 0
70 [MLF2006] J072046.96+710922.8 G 07 20 46.96 +71 09 22.8       21.21   ~ 2 0
71 [MLF2006] J072048.06+711037.5 G 07 20 48.06 +71 10 37.5       20.82   ~ 2 0
72 [MLF2006] J072049.93+710856.6 G 07 20 49.93 +71 08 56.6       21.42   ~ 2 0
73 [MLF2006] J072050.33+710925.7 G 07 20 50.33 +71 09 25.7       22.39   ~ 2 0
74 MCXC J0720.8+7108 ClG 07 20 53.7 +71 08 57           ~ 14 0
75 [JML2007] J072053.92+710859.5 G 07 20 53.8782377232 +71 08 59.159820300       18.33   ~ 3 0
76 [JML2007] J072054.63+710858.0 G 07 20 54.681 +71 08 57.73       18.81   ~ 3 0
77 [MLF2006] J072058.02+710916.2 G 07 20 58.02 +71 09 16.2       20.87   ~ 2 0
78 [MLF2006] J072059.93+710932.2 G 07 20 59.93 +71 09 32.2       20.98   ~ 2 0
79 [MLF2006] J072101.09+711038.2 G 07 21 01.09 +71 10 38.2       22.21   ~ 2 0
80 [MLF2006] J072103.43+710917.7 G 07 21 03.43 +71 09 17.7       20.61   ~ 2 0
81 [MLF2006] J072103.45+710906.0 G 07 21 03.45 +71 09 06.0       21.38   ~ 2 0
82 [MLF2006] J072109.09+710922.1 G 07 21 09.09 +71 09 22.1       20.78   ~ 2 0
83 [MLF2006] J072109.63+710903.3 G 07 21 09.63 +71 09 03.3       23.18   ~ 2 0
84 [JML2007] J072111.44+710857.2 G 07 21 11.4331697424 +71 08 56.875579512       20.31   ~ 3 0
85 [MLF2006] J072113.26+710949.8 G 07 21 13.26 +71 09 49.8       21.42   ~ 2 0
86 [MLF2006] J072114.17+711028.0 G 07 21 14.17 +71 10 28.0       21.66   ~ 2 0
87 [MLF2006] J072117.70+711035.0 G 07 21 17.70 +71 10 35.0       22.40   ~ 2 0
88 [MLF2006] J120535.80+443026.0 G 12 05 35.80 +44 30 26.0       21.57   ~ 2 0
89 [MLF2006] J120535.96+442833.5 G 12 05 35.96 +44 28 33.5       21.54   ~ 2 0
90 [MLF2006] J120538.47+443023.4 G 12 05 38.47 +44 30 23.4       20.65   ~ 2 0
91 [MLF2006] J120538.70+442906.4 G 12 05 38.70 +44 29 06.4       20.55   ~ 2 0
92 [MLF2006] J120543.22+442939.5 G 12 05 43.22 +44 29 39.5       21.67   ~ 2 0
93 [MLF2006] J120545.52+442901.1 G 12 05 45.52 +44 29 01.1       22.66   ~ 2 0
94 [MLF2006] J120545.69+442958.4 G 12 05 45.69 +44 29 58.4       22.82   ~ 2 0
95 [MLF2006] J120546.07+443002.9 G 12 05 46.07 +44 30 02.9       21.85   ~ 2 0
96 [UAC2005] 7 GiG 12 05 51.390 +44 29 09.86       20.64   ~ 4 1
97 [MLF2006] J120551.64+443020.2 G 12 05 51.64 +44 30 20.2       20.00   ~ 2 0
98 ClG J1205+4429 GrG 12 05 52.3 +44 29 22           ~ 24 0
99 [MLF2006] J120556.12+442948.7 G 12 05 56.12 +44 29 48.7       23.10   ~ 2 0
100 [MLF2006] J120557.92+442949.2 G 12 05 57.92 +44 29 49.2       21.21   ~ 2 0
101 [MLF2006] J120558.44+442939.7 G 12 05 58.44 +44 29 39.7       22.02   ~ 2 0
102 [MLF2006] J120559.08+442915.1 G 12 05 59.08 +44 29 15.1       21.94   ~ 2 0
103 [MLF2006] J120601.28+442832.2 G 12 06 01.28 +44 28 32.2       21.60   ~ 2 0
104 [MLF2006] J120607.22+442938.8 G 12 06 07.22 +44 29 38.8           ~ 2 0
105 [MLF2006] J120608.40+442933.9 G 12 06 08.40 +44 29 33.9       22.07   ~ 2 0
106 [MLF2006] J120610.36+442946.3 G 12 06 10.36 +44 29 46.3       21.66   ~ 2 0
107 [MLF2006] J125552.68+255541.4 G 12 55 52.68 +25 55 41.4       22.42   ~ 2 0
108 [JML2007] J125552.83+255726.6 G 12 55 53.01 +25 57 23.9       19.00   ~ 3 0
109 [PMD2011] J125554.33+255614.5 G 12 55 54.33 +25 56 14.5       20.60   ~ 3 0
110 [PMD2011] J125555.55+255710.8 G 12 55 55.55 +25 57 10.8       20.73   ~ 3 0
111 [PMD2011] J125555.59+255633.8 G 12 55 55.59 +25 56 33.8       20.51   ~ 3 0
112 [JML2007] J125556.17+255559.6 G 12 55 56.30 +25 55 56.3       19.73   ~ 3 0
113 [MLF2006] J125557.72+255645.0 G 12 55 57.72 +25 56 45.0       21.62   ~ 2 0
114 [MLF2006] J125558.24+255707.5 G 12 55 58.24 +25 57 07.5       21.81   ~ 2 0
115 [MLF2006] J125558.43+255559.8 G 12 55 58.43 +25 55 59.8       21.86   ~ 2 0
116 [MLF2006] J125558.54+255603.2 G 12 55 58.54 +25 56 03.2       21.42   ~ 2 0
117 [MLF2006] J125559.37+255644.0 G 12 55 59.37 +25 56 44.0       21.36   ~ 2 0
118 [PMD2011] J125600.57+255722.8 G 12 56 00.57 +25 57 22.8       21.12   ~ 3 0
119 [MLF2006] J125601.28+255659.9 G 12 56 01.28 +25 56 59.9       20.02   ~ 2 0
120 [MLF2006] J125602.01+255701.4 G 12 56 02.01 +25 57 01.4       19.90   ~ 2 0
121 [MLF2006] J125602.11+255638.5 G 12 56 02.11 +25 56 38.5           ~ 2 0
122 [PMD2011] J125602.67+255632.8 G 12 56 02.67 +25 56 32.8       17.21   ~ 3 0
123 [JML2007] J125603.34+255704.6 G 12 56 03.48 +25 57 02.2       20.40   ~ 3 0
124 [MLF2006] J125604.40+255626.9 G 12 56 04.40 +25 56 26.9       22.02   ~ 2 0
125 2XMM J125602.2+255636 GrG 12 56 04.9 +25 56 52           ~ 34 0
126 [MLF2006] J125606.21+255603.8 G 12 56 06.21 +25 56 03.8       22.32   ~ 2 0
127 [MLF2006] J125606.41+255619.0 G 12 56 06.41 +25 56 19.0       22.07   ~ 2 0
128 [JML2007] J125607.03+255726.1 G 12 56 07.18 +25 57 23.9       19.88   ~ 3 0
129 [PMD2011] J125608.88+255557.9 G 12 56 08.88 +25 55 57.9       20.24   ~ 3 0
130 [PMD2011] J125609.04+255547.5 G 12 56 09.04 +25 55 47.5       20.69   ~ 3 0
131 [PMD2011] J125609.34+255609.6 G 12 56 09.34 +25 56 09.6       21.58   ~ 3 0
132 [MLF2006] J125610.81+255535.4 G 12 56 10.81 +25 55 35.4       20.90   ~ 2 0
133 [MLF2006] J125612.98+255649.2 G 12 56 12.98 +25 56 49.2       21.81   ~ 2 0
134 [MLF2006] J125613.40+255622.9 G 12 56 13.40 +25 56 22.9       20.71   ~ 2 0
135 [MLF2006] J125613.87+255531.1 G 12 56 13.87 +25 55 31.1       20.98   ~ 2 0
136 [MLF2006] J125616.11+255600.4 G 12 56 16.11 +25 56 00.4       20.05   ~ 2 0
137 [MLF2006] J125617.00+255719.3 G 12 56 17.00 +25 57 19.3       19.84   ~ 2 0
138 [MLF2006] J125617.17+255649.9 G 12 56 17.17 +25 56 49.9       21.88   ~ 2 0
139 NAME NGC 5171 Group GrG 13 29 05.10 +11 45 04.8     4.7     ~ 78 0
140 NGC 5171 GiG 13 29 21.5707210536 +11 44 06.389823624   14.7       ~ 61 0
141 [MLF2006] J133446.05+375051.2 G 13 34 46.05 +37 50 51.2       20.17   ~ 2 0
142 [MLF2006] J133449.29+375057.2 G 13 34 49.29 +37 50 57.2       19.36   ~ 2 0
143 [MLF2006] J133452.18+375033.2 G 13 34 52.18 +37 50 33.2       20.56   ~ 2 0
144 [MLF2006] J133454.34+375021.3 G 13 34 54.34 +37 50 21.3       20.64   ~ 2 0
145 [MLF2006] J133454.96+374905.6 G 13 34 54.96 +37 49 05.6       19.44   ~ 2 0
146 [MLF2006] J133457.86+375027.7 G 13 34 57.86 +37 50 27.7       18.77   ~ 2 0
147 [MLF2006] J133458.05+375004.4 G 13 34 58.05 +37 50 04.4       19.15   ~ 2 0
148 [MGN2003] 160 GrG 13 34 58.83 +37 50 17.7       23.6   ~ 14 0
149 [MLF2006] J133501.43+374943.5 G 13 35 01.43 +37 49 43.5       20.88   ~ 2 0
150 [JML2007] J133502.60+375011.3 BiC 13 35 02.5761545400 +37 50 10.021867152       18.76   ~ 5 0
151 [MLF2006] J133506.41+374950.6 G 13 35 06.41 +37 49 50.6       18.8   ~ 1 0
152 [MLF2006] J133506.99+374921.2 G 13 35 06.99 +37 49 21.2           ~ 2 0
153 [MLF2006] J133510.62+374947.6 G 13 35 10.62 +37 49 47.6       19.60   ~ 2 0
154 [MLF2006] J134747.68+075239.0 G 13 47 47.68 +07 52 39.0       19.16   ~ 2 0
155 RX J1347.9+0752 GrG 13 47 59.51 +07 52 12.1           ~ 2 0
156 [MLF2006] J134759.78+075210.8 G 13 47 59.78 +07 52 10.8       20.77   ~ 2 0
157 [MLF2006] J134800.64+075221.4 G 13 48 00.64 +07 52 21.4       19.94   ~ 2 0
158 [MLF2006] J134800.98+075222.1 G 13 48 00.98 +07 52 22.1       19.26   ~ 2 0
159 [MLF2006] J134805.65+075200.5 G 13 48 05.65 +07 52 00.5       20.89   ~ 2 0
160 [MLF2006] J134811.36+075021.3 G 13 48 11.36 +07 50 21.3       19.45   ~ 2 0
161 [MLF2006] J134813.10+075149.2 G 13 48 13.10 +07 51 49.2       20.29   ~ 2 0
162 [MLF2006] J164816.01+601954.3 G 16 48 16.01 +60 19 54.3       19.46   ~ 2 0
163 [MLF2006] J164816.35+601913.8 G 16 48 16.35 +60 19 13.8       19.87   ~ 2 0
164 [MLF2006] J164820.40+601950.2 G 16 48 20.40 +60 19 50.2       20.23   ~ 2 0
165 [MLF2006] J164826.67+602018.5 G 16 48 26.67 +60 20 18.5       21.38   ~ 2 0
166 [MLF2006] J164836.29+602002.1 G 16 48 36.29 +60 20 02.1       18.83   ~ 2 0
167 [MLF2006] J164838.03+601932.3 AGN 16 48 38.03 +60 19 32.3       19.63   ~ 3 0
168 [MLF2006] J164841.54+601851.5 G 16 48 41.54 +60 18 51.5       19.44   ~ 2 0
169 RX J1648.7+6019 GrG 16 48 42.5 +60 19 10           ~ 9 0
170 [MLF2006] J164842.51+601908.1 G 16 48 42.51 +60 19 08.1       18.74   ~ 2 0
171 [MLF2006] J164844.27+601954.5 G 16 48 44.27 +60 19 54.5       19.03   ~ 2 0
172 [MLF2006] J164844.38+601932.8 G 16 48 44.38 +60 19 32.8       19.34   ~ 2 0
173 [MLF2006] J164845.75+601829.1 G 16 48 45.75 +60 18 29.1       19.58   ~ 2 0
174 [MLF2006] J164846.25+601941.6 G 16 48 46.25 +60 19 41.6       19.07   ~ 2 0
175 [MLF2006] J164848.26+602001.5 G 16 48 48.26 +60 20 01.5       21.52   ~ 2 0
176 [MLF2006] J164848.88+602000.4 G 16 48 48.88 +60 20 00.4       18.96   ~ 2 0
177 [MLF2006] J164851.76+601924.5 G 16 48 51.76 +60 19 24.5       20.35   ~ 2 0
178 [MLF2006] J164853.97+601919.6 G 16 48 53.97 +60 19 19.6       19.67   ~ 2 0
179 [MLF2006] J164858.35+601935.4 G 16 48 58.35 +60 19 35.4       18.89   ~ 2 0
180 [MLF2006] J164909.16+601929.9 G 16 49 09.16 +60 19 29.9       20.72   ~ 2 0

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