2003A&A...399..813F


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.18CEST17:17:23

2003A&A...399..813F - Astronomy and Astrophysics, volume 399, 813-828 (2003/3-1)

Multiple merging events in Abell 521.

FERRARI C., MAUROGORDATO S., CAPPI A. and BENOIST C.

Abstract (from CDS):

We present a detailed spatial and dynamical analysis of the central ∼2.2h75–1Mpc region of the galaxy cluster Abell 521 (z=0.247), based on 238 spectra (of which 191 new measurements) obtained at the 3.6m Telescope of the European Southern Observatory and at the Canada-France-Hawaii Telescope. From the analysis of the 125 galaxies that are confirmed members of the cluster, we derive a location (``mean'' velocity) of CBI=74019 +112–125km/s and detect a complex velocity distribution with high velocity scale (``dispersion'', SBI=1325+145–100km/s), but clear departure from a single Gaussian component. When excluding a possible background group of four galaxies, the velocity dispersion remains still large (∼1200km/s). The general structure of the cluster follows a North-West/South-East direction, crossed by a perpendicular high density ``ridge'' of galaxies in the core region. The Northern region of the cluster is characterized by a lower velocity dispersion as compared to the whole cluster value; it hosts the BCG and a dynamically bound complex of galaxies, and it is associated with a group detected in X-ray (Arnaud et al., 2000A&A...355..461A). This region could be in a stage of pre-merger onto the main cluster. The small offset (~+250km/s) in the mean velocity of the northern region as compared to the whole cluster suggests that the merging occurs partly in the plane of the sky. These results, taken together with the fact that most of the clumps detected on the isodensity maps, as well as the early-type galaxies and the brightest ones (L>L*) are aligned, suggest that this North-West/South-East direction is the preferred one for the formation of this cluster. The central high dense region (``ridge'') shows a lower velocity location (CBI=73625+344–350km/s) and significantly higher scale (1780+234–142km/s) as compared to the whole cluster values. This is due to the presence of a low-velocity group of galaxies with a high fraction of emission line objects. This can be explained in a scenario in which a merging of subclusters has recently occurred along the direction of the ``ridge'' with a significant component along the line of sight. The low-velocity group would then be a high-speed remnant of the collision which would have also triggered an episode of intense star formation responsible for the large fraction of late-type objects in this region.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: general - galaxies: clusters: individual: Abell 521 - galaxies: distances and redshifts - cosmology: observations

VizieR on-line data: <Available at CDS (J/A+A/399/813): table10.dat>

Nomenclature: Fig.1: [FMC2003] gN (Nos g1-g6), [FMC2003] BCG group N=1, [FMC2003] Ridge N=1. Table 10: [FMC2003] NNN (Nos 1-191).

Simbad objects: 207

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Number of rows : 207

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 ZwCl 0024+1652 ClG 00 26 36.0 +17 08 36     18.35     ~ 597 1
2 ACO 518 ClG 04 51 22.0 -10 43 50           ~ 13 0
3 [FMC2003] 1 GiC 04 53 47.91 -10 11 23.5           ~ 1 0
4 [FMC2003] 2 GiC 04 53 48.34 -10 11 49.6           ~ 1 0
5 [FMC2003] 3 GiC 04 53 49.70 -10 13 32.4           ~ 1 0
6 [FMC2003] 4 GiC 04 53 49.94 -10 11 18.8           ~ 1 0
7 [FMC2003] 5 GiC 04 53 50.26 -10 12 19.0           ~ 1 0
8 [FMC2003] 6 GiC 04 53 50.96 -10 10 17.0           ~ 1 0
9 [FMC2003] 7 * 04 53 51.55 -10 12 42.9           ~ 1 0
10 [FMC2003] 8 * 04 53 52.01 -10 11 52.3           ~ 1 0
11 [FMC2003] 9 GiC 04 53 52.05 -10 12 31.3           ~ 1 0
12 2MASS J04535265-1013232 * 04 53 52.6488964605 -10 13 23.195523522           ~ 1 0
13 [FMC2003] 11 GiC 04 53 53.19 -10 10 44.0           ~ 1 0
14 [FMC2003] 12 GiC 04 53 53.86 -10 12 23.3           ~ 1 0
15 2MASS J04535444-1012291 * 04 53 54.4404825962 -10 12 29.178451256           ~ 1 0
16 [FMC2003] 14 GiC 04 53 54.75 -10 12 19.6           ~ 1 0
17 2MASS J04535478-1010512 * 04 53 54.7939916866 -10 10 51.243524828           ~ 1 0
18 [FMC2003] 16 GiC 04 53 55.45 -10 15 01.0           ~ 1 0
19 [FMC2003] 17 GiC 04 53 56.40 -10 10 02.1           ~ 1 0
20 [FMC2003] 18 GiC 04 53 56.44 -10 13 26.8           ~ 1 0
21 [FMC2003] 19 GiC 04 53 56.56 -10 14 46.3           ~ 1 0
22 [FMC2003] 20 GiC 04 53 56.66 -10 11 41.2           ~ 1 0
23 [FMC2003] 21 GiC 04 53 57.33 -10 14 09.9           ~ 1 0
24 [FMC2003] 22 GiC 04 53 57.82 -10 14 24.5           ~ 1 0
25 [FMC2003] 23 GiC 04 53 58.10 -10 12 09.2           ~ 2 0
26 [FMC2003] 24 GiC 04 53 58.60 -10 14 20.4           ~ 1 0
27 [FMC2003] 25 GiC 04 53 58.77 -10 13 25.8           ~ 1 0
28 [FMC2003] 26 GiC 04 53 58.95 -10 11 26.1           ~ 1 0
29 [FMC2003] 27 GiC 04 53 59.29 -10 13 01.1           ~ 1 0
30 2MASS J04535938-1013123 * 04 53 59.3895722310 -10 13 12.524131081           ~ 1 0
31 [FMC2003] 29 GiC 04 53 59.51 -10 12 59.9           ~ 1 0
32 [FMC2003] 30 GiC 04 53 59.93 -10 13 01.6           ~ 1 0
33 [FMC2003] 31 GiC 04 54 00.17 -10 11 14.6           ~ 1 0
34 [FMC2003] 32 GiC 04 54 00.27 -10 14 05.1           ~ 1 0
35 [FMC2003] 33 GiC 04 54 00.54 -10 11 55.6           ~ 1 0
36 [FMC2003] 34 GiC 04 54 00.70 -10 13 09.7           ~ 1 0
37 [FMC2003] 35 GiC 04 54 01.17 -10 12 23.1           ~ 1 0
38 [FMC2003] 36 GiC 04 54 01.41 -10 11 16.3           ~ 1 0
39 [FMC2003] 37 GiC 04 54 01.62 -10 14 07.2           ~ 1 0
40 [FMC2003] 38 GiC 04 54 01.75 -10 12 34.5           ~ 1 0
41 [FMC2003] 39 GiC 04 54 02.16 -10 11 09.7           ~ 1 0
42 [FMC2003] 40 GiC 04 54 02.26 -10 12 49.9           ~ 1 0
43 [FMC2003] 41 GiC 04 54 02.34 -10 14 04.4           ~ 1 0
44 [FMC2003] 42 GiC 04 54 02.61 -10 13 01.8           ~ 1 0
45 [FMC2003] 43 * 04 54 02.97 -10 11 29.1           ~ 1 0
46 [FMC2003] 44 GiC 04 54 03.26 -10 13 22.4           ~ 1 0
47 [FMC2003] 45 GiC 04 54 03.91 -10 12 15.7           ~ 1 0
48 [FMC2003] 46 GiC 04 54 04.02 -10 14 42.4           ~ 1 0
49 2MASS J04540403-1009215 * 04 54 04.0294443430 -10 09 21.731364145           ~ 1 0
50 2MASS J04540412-1014207 * 04 54 04.1181372803 -10 14 20.842058138           ~ 1 0
51 2MASS J04540446-1011545 * 04 54 04.4717301192 -10 11 54.457181235           ~ 1 0
52 [FMC2003] 50 GiC 04 54 04.58 -10 14 14.4           ~ 1 0
53 [FMC2003] 51 GiC 04 54 04.63 -10 17 31.7           ~ 1 0
54 [FMC2003] 52 GiC 04 54 04.90 -10 12 03.7           ~ 1 0
55 [FMC2003] 53 GiC 04 54 05.06 -10 16 04.3           ~ 1 0
56 [FMC2003] 54 GiC 04 54 05.24 -10 10 31.1           ~ 1 0
57 [FMC2003] 55 GiC 04 54 05.48 -10 14 10.8           ~ 1 0
58 [FMC2003] 56 GiC 04 54 05.55 -10 17 37.3           ~ 1 0
59 2MASS J04540557-1011147 * 04 54 05.5970204668 -10 11 14.612219525           ~ 1 0
60 [FMC2003] 58 GiC 04 54 05.79 -10 11 41.7           ~ 1 0
61 [FMC2003] 59 GiC 04 54 05.98 -10 13 16.6           ~ 1 0
62 2MASS J04540622-1012388 * 04 54 06.2176107953 -10 12 38.591555633           ~ 1 0
63 [FMC2003] 62 GiC 04 54 06.36 -10 18 14.4           ~ 1 0
64 [FMC2003] 61 GiC 04 54 06.36 -10 10 49.9           ~ 1 0
65 [FMC2003] 63 GiC 04 54 06.37 -10 16 00.0           ~ 1 0
66 [FMC2003] 64 GiC 04 54 06.43 -10 13 24.8           ~ 1 0
67 [GVB2006] J0454-1013b GiC 04 54 06.56 -10 13 21.3           ~ 2 0
68 [FMC2003] 66 GiC 04 54 06.64 -10 15 36.0           ~ 1 0
69 [FMC2003] 67 GiC 04 54 06.65 -10 11 06.5           ~ 1 0
70 2MASX J04540687-1013247 BiC 04 54 06.870 -10 13 24.79           ~ 6 0
71 2MASS J04540695-1011461 * 04 54 06.9548916926 -10 11 46.138128992           ~ 1 0
72 [FMC2003] 69 GiC 04 54 07.02 -10 16 04.2           ~ 1 0
73 [FMC2003] 70 GiC 04 54 07.03 -10 12 07.5           ~ 1 0
74 [FMC2003] 71 GiC 04 54 07.06 -10 17 55.9           ~ 1 0
75 [FMC2003] 72 GiC 04 54 07.10 -10 13 16.8           ~ 1 0
76 [FMC2003] 73 GiC 04 54 07.12 -10 12 41.2           ~ 1 0
77 [FMC2003] 74 GiC 04 54 07.14 -10 15 11.4           ~ 1 0
78 [FMC2003] 75 GiC 04 54 07.97 -10 17 41.8           ~ 1 0
79 [FMC2003] 76 GiC 04 54 08.05 -10 14 01.9           ~ 1 0
80 [FMC2003] 77 GiC 04 54 08.11 -10 10 20.5           ~ 1 0
81 [FMC2003] 78 GiC 04 54 08.14 -10 11 11.8           ~ 1 0
82 [FMC2003] 79 GiC 04 54 08.23 -10 14 58.6           ~ 1 0
83 [FMC2003] 80 GiC 04 54 08.28 -10 14 32.3           ~ 1 0
84 [FMC2003] 81 GiC 04 54 08.31 -10 17 13.6           ~ 1 0
85 [FMC2003] 82 GiC 04 54 08.41 -10 12 41.9           ~ 1 0
86 [FMC2003] 83 GiC 04 54 08.56 -10 15 13.6           ~ 1 0
87 [FMC2003] 84 GiC 04 54 08.60 -10 15 50.1           ~ 1 0
88 ACO 521 ClG 04 54 08.6 -10 14 39           ~ 206 0
89 [FMC2003] 85 GiC 04 54 08.71 -10 18 19.2           ~ 1 0
90 [FMC2003] 86 GiC 04 54 08.83 -10 10 48.4           ~ 1 0
91 [FMC2003] 87 GiC 04 54 08.88 -10 14 58.0           ~ 1 0
92 [FMC2003] 88 GiC 04 54 08.99 -10 11 07.0           ~ 1 0
93 [FMC2003] 89 GiC 04 54 09.08 -10 15 34.9           ~ 1 0
94 [GVB2006] J0454-1015 GiC 04 54 09.33 -10 15 10.1           ~ 2 0
95 [FMC2003] 91 GiC 04 54 09.37 -10 14 10.5           ~ 2 0
96 [FMC2003] 92 GiC 04 54 09.47 -10 17 11.8           ~ 1 0
97 [FMC2003] 93 GiC 04 54 09.50 -10 16 44.9           ~ 1 0
98 [FMC2003] 94 GiC 04 54 09.86 -10 16 03.1           ~ 1 0
99 [FMC2003] 96 GiC 04 54 09.90 -10 17 34.2           ~ 1 0
100 [FMC2003] 95 GiC 04 54 09.90 -10 14 13.4           ~ 1 0
101 2MASS J04541017-1012550 * 04 54 10.1806584224 -10 12 55.026922571           ~ 1 0
102 [FMC2003] 98 GiC 04 54 10.39 -10 14 46.0           ~ 1 0
103 [FMC2003] 99 GiC 04 54 10.58 -10 15 10.5           ~ 1 0
104 [FMC2003] 100 GiC 04 54 10.72 -10 11 50.0           ~ 1 0
105 [FMC2003] 101 GiC 04 54 11.06 -10 17 35.2           ~ 1 0
106 2MASS J04541109-1015325 * 04 54 11.09 -10 15 32.6           ~ 1 0
107 2MASS J04541148-1018116 * 04 54 11.4918278958 -10 18 11.477506437           ~ 1 0
108 [FMC2003] 104 GiC 04 54 11.57 -10 15 13.0           ~ 1 0
109 [GVB2006] J0454-1014a GiC 04 54 11.72 -10 14 35.3           ~ 2 0
110 [FMC2003] 107 PM* 04 54 11.9548430062 -10 17 58.633170869           ~ 1 0
111 2MASS J04541203-1010269 * 04 54 12.0353563087 -10 10 26.954773773           ~ 1 0
112 2MASS J04541229-1016335 * 04 54 12.2949991942 -10 16 33.427013048           ~ 1 0
113 [FMC2003] 109 GiC 04 54 12.39 -10 14 13.7           ~ 1 0
114 [FMC2003] 110 GiC 04 54 12.50 -10 14 20.3           ~ 2 0
115 [FMC2003] 111 GiC 04 54 12.73 -10 15 51.2           ~ 1 0
116 [FMC2003] 112 GiC 04 54 13.02 -10 15 51.8           ~ 1 0
117 [FMC2003] 113 GiC 04 54 13.09 -10 13 52.6           ~ 1 0
118 [FMC2003] 114 GiC 04 54 13.10 -10 14 17.5           ~ 1 0
119 [FMC2003] 115 GiC 04 54 13.14 -10 13 21.4           ~ 1 0
120 [FMC2003] 116 GiC 04 54 13.19 -10 16 08.9           ~ 1 0
121 [FMC2003] 117 GiC 04 54 13.37 -10 13 58.4           ~ 1 0
122 [FMC2003] 118 GiC 04 54 13.39 -10 15 17.7           ~ 1 0
123 [FMC2003] 119 * 04 54 13.44 -10 11 17.7           ~ 1 0
124 [FMC2003] 120 GiC 04 54 13.54 -10 17 27.3           ~ 1 0
125 [GVB2006] J0454-1013d GiC 04 54 13.90 -10 13 32.3           ~ 3 0
126 [FMC2003] 123 GiC 04 54 13.97 -10 18 02.6           ~ 1 0
127 [FMC2003] 122 GiC 04 54 13.97 -10 11 13.6           ~ 1 0
128 [FMC2003] 124 GiC 04 54 14.10 -10 14 07.5           ~ 1 0
129 [FMC2003] 125 GiC 04 54 14.21 -10 13 43.4           ~ 1 0
130 [FMC2003] 126 GiC 04 54 14.26 -10 13 54.3           ~ 1 0
131 [FMC2003] 127 GiC 04 54 14.53 -10 14 43.2           ~ 1 0
132 [FMC2003] 128 GiC 04 54 14.55 -10 12 35.3           ~ 1 0
133 [FMC2003] 129 GiC 04 54 14.69 -10 18 23.6           ~ 1 0
134 [FMC2003] 130 GiC 04 54 14.77 -10 17 47.3           ~ 1 0
135 [FMC2003] 131 GiC 04 54 14.99 -10 11 21.6           ~ 1 0
136 [FMC2003] 132 GiC 04 54 15.03 -10 13 48.9           ~ 1 0
137 [FMC2003] 133 GiC 04 54 15.48 -10 13 54.2           ~ 1 0
138 [FMC2003] 134 GiC 04 54 15.62 -10 17 20.9           ~ 1 0
139 [FMC2003] 135 GiC 04 54 15.68 -10 10 09.5           ~ 1 0
140 [FMC2003] 136 GiC 04 54 15.76 -10 14 01.2           ~ 1 0
141 [FMC2003] 137 GiC 04 54 15.81 -10 16 47.4           ~ 1 0
142 [FMC2003] 138 GiC 04 54 15.88 -10 15 05.8           ~ 1 0
143 [FMC2003] 139 GiC 04 54 16.01 -10 16 11.6           ~ 1 0
144 [FMC2003] 140 GiC 04 54 16.05 -10 12 57.7           ~ 1 0
145 [FMC2003] 141 GiC 04 54 16.08 -10 10 08.9           ~ 1 0
146 2MASS J04541613-1012079 * 04 54 16.1427517064 -10 12 07.906957822           ~ 1 0
147 [GVB2006] J0454-1016a GiC 04 54 16.34 -10 16 04.6           ~ 4 0
148 [FMC2003] 144 GiC 04 54 16.44 -10 15 09.6           ~ 1 0
149 [FMC2003] 145 GiC 04 54 16.52 -10 17 54.3           ~ 1 0
150 [FMC2003] 146 GiC 04 54 16.60 -10 14 30.6           ~ 1 0
151 [FMC2003] 147 GiC 04 54 16.92 -10 18 09.9           ~ 1 0
152 [FMC2003] 148 GiC 04 54 17.12 -10 14 25.2           ~ 1 0
153 [FMC2003] 149 GiC 04 54 17.38 -10 10 57.7           ~ 1 0
154 [FMC2003] 150 GiC 04 54 17.54 -10 13 05.0           ~ 1 0
155 [FMC2003] 151 GiC 04 54 17.57 -10 18 00.6           ~ 1 0
156 2MASS J04541791-1018043 * 04 54 17.9467340489 -10 18 04.251990272           ~ 1 0
157 [FMC2003] 153 GiC 04 54 18.17 -10 10 30.2           ~ 1 0
158 [FMC2003] 154 GiC 04 54 18.19 -10 13 38.6           ~ 1 0
159 [FMC2003] 155 GiC 04 54 18.39 -10 13 22.6           ~ 1 0
160 [FMC2003] 156 GiC 04 54 18.43 -10 16 50.7           ~ 2 0
161 [FMC2003] 157 GiC 04 54 18.56 -10 13 39.2           ~ 1 0
162 [FMC2003] 158 GiC 04 54 18.87 -10 18 12.2           ~ 1 0
163 [FMC2003] 159 GiC 04 54 18.87 -10 11 42.9           ~ 1 0
164 [FMC2003] 160 GiC 04 54 18.92 -10 15 16.9           ~ 1 0
165 [FMC2003] 161 GiC 04 54 19.08 -10 16 35.2           ~ 1 0
166 [FMC2003] 162 GiC 04 54 19.23 -10 15 19.1           ~ 1 0
167 [FMC2003] 163 GiC 04 54 19.32 -10 16 45.2           ~ 1 0
168 [FMC2003] 165 GiC 04 54 19.78 -10 11 27.1           ~ 1 0
169 2MASS J04541978-1013490 * 04 54 19.7827600024 -10 13 49.168720608           ~ 1 0
170 [FMC2003] 166 GiC 04 54 20.06 -10 13 28.7           ~ 1 0
171 2MASS J04542053-1010220 PM* 04 54 20.5349561018 -10 10 22.033016264           ~ 1 0
172 [FMC2003] 168 GiC 04 54 20.65 -10 17 26.1           ~ 1 0
173 2MASS J04542095-1013554 * 04 54 20.9499010866 -10 13 55.446161006           ~ 1 0
174 [GVB2006] J0454-1016b GiC 04 54 20.96 -10 16 44.8           ~ 2 0
175 2MASS J04542108-1009402 * 04 54 21.0873334519 -10 09 40.192236292           ~ 1 0
176 [FMC2003] 172 GiC 04 54 21.29 -10 12 07.4           ~ 1 0
177 [FMC2003] 173 GiC 04 54 21.30 -10 14 46.3           ~ 1 0
178 [FMC2003] 174 GiC 04 54 21.63 -10 12 02.6           ~ 1 0
179 [FMC2003] 175 GiC 04 54 21.65 -10 16 41.0           ~ 1 0
180 2MASS J04542221-1014499 * 04 54 22.2219780771 -10 14 49.990503863           ~ 1 0
181 [FMC2003] 177 GiC 04 54 22.32 -10 16 25.3           ~ 1 0
182 [GVB2006] J0454-1017b GiC 04 54 22.35 -10 17 13.4           ~ 2 0
183 [FMC2003] 179 GiC 04 54 22.64 -10 16 40.7           ~ 1 0
184 [FMC2003] 180 GiC 04 54 22.70 -10 15 13.0           ~ 1 0
185 [FMC2003] 181 GiC 04 54 23.18 -10 17 58.1           ~ 1 0
186 2MASS J04542319-1012380 * 04 54 23.2042273848 -10 12 38.112692304           ~ 1 0
187 [FMC2003] 183 GiC 04 54 23.25 -10 11 33.5           ~ 1 0
188 [FMC2003] 185 GiC 04 54 23.73 -10 17 10.7           ~ 1 0
189 [FMC2003] 184 GiC 04 54 23.73 -10 13 05.9           ~ 1 0
190 [FMC2003] 186 GiC 04 54 23.93 -10 11 26.5           ~ 1 0
191 [FMC2003] 187 * 04 54 24.16 -10 14 00.7           ~ 1 0
192 [FMC2003] 188 GiC 04 54 24.55 -10 16 40.9           ~ 1 0
193 [FMC2003] 189 GiC 04 54 24.60 -10 14 12.1           ~ 1 0
194 [FMC2003] 190 GiC 04 54 24.77 -10 14 14.8           ~ 1 0
195 [FMC2003] 191 GiC 04 54 24.91 -10 16 58.0           ~ 1 0
196 [FMC2003] BCG group GrG ~ ~           ~ 2 0
197 [FMC2003] g1 GrG ~ ~           ~ 1 0
198 [MPB2000] E PoG ~ ~           ~ 2 0
199 [MPB2000] B PoG ~ ~           ~ 2 0
200 [FMC2003] g6 GrG ~ ~           ~ 1 0
201 [MPB2000] D PoG ~ ~           ~ 2 0
202 [FMC2003] g5 GrG ~ ~           ~ 1 0
203 [MPB2000] C PoG ~ ~           ~ 2 0
204 [FMC2003] g4 GrG ~ ~           ~ 1 0
205 [FMC2003] g3 GrG ~ ~           ~ 1 0
206 [FMC2003] g2 GrG ~ ~           ~ 1 0
207 [FMC2003] Ridge GrG ~ ~           ~ 2 0

    Equat.    Gal    SGal    Ecl

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2019.10.18-17:17:23

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