2010A&A...521A..78B

Query : 2010A&A...521A..78B

2010A&A...521A..78B - Astronomy and Astrophysics, volume 521, A78-78 (2010/10-1)

The complex structure of Abell 2345: a galaxy cluster with non-symmetric radio relics.

BOSCHIN W., BARRENA R. and GIRARDI M.

Abstract (from CDS):

The connection of cluster mergers with the presence of extended, diffuse radio sources in galaxy clusters is still debated. We aim to obtain new insights into the internal dynamics of the cluster Abell 2345. This cluster exhibits two non-symmetric radio relics well studied through recent, deep radio data.Our analysis is based on redshift data for 125 galaxies acquired at the Telescopio Nazionale Galileo and on new photometric data acquired at the Isaac Newton Telescope. We also use ROSAT/HRI archival X-ray data. We combine galaxy velocities and positions to select 98 cluster galaxies and analyze the internal dynamics of the cluster.We estimate a mean redshift <z≥0.1789 and a line-of-sight (LOS) velocity dispersion σV∼1070km/s. The two-dimensional galaxy distribution reveals the presence of three significant peaks within a region of ∼1h70–1Mpc (the E, NW, and SW peaks). The spectroscopic catalog confirms the presence of these three clumps. The SW and NW clumps have similar mean velocities, while the E clump has a larger mean velocity (ΔVrf∼800km/s); this structure causes the presence of the two peaks we find in the cluster velocity distribution. The difficulty in separating the galaxy clumps leads to a very uncertain mass estimate M∼2x1015h70–1M☉. Moreover, the E clump well coincides with the main mass peak as recovered from the weak gravitational lensing analysis and is off-set to the east from the BCG by ∼1.3'. The ROSAT X-ray data also show a very complex structure, mainly elongated in the E-W direction, with two (likely three) peaks in the surface brightness distribution, which, however, are off-set from the position of the peaks in the galaxy density. The observed phenomenology agrees with the hypothesis that we are looking at a complex cluster merger occurring along two directions: a major merger along the ∼E-W direction (having a component along the LOS) and a minor merger in the western cluster regions along the ∼N-S direction, roughly parallel to the plane of the sky. The eastern radio relic is elongated in the direction perpendicular to that of the major merger, while the peculiar, western radio relic is elongated in the direction perpendicular to the bisecting of the two merger directions. Our scenario for the internal dynamics of Abell 2345 strongly supports the use of the ``outgoing merger shocks'' model to explain the two radio relics, suggesting a consistent justification for their asymmetry.

Abstract Copyright: ∼

Journal keyword(s): galaxies: clusters: individual: Abell 2345 - galaxies: clusters: general - galaxies: distances and redshifts

VizieR on-line data: <Available at CDS (J/A+A/521/A78): table1.dat>

Nomenclature: Table 1: [BBG2010c] NNN (Nos 1-125).

Simbad objects: 138

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Number of rows : 138
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 SA 92- reg 00 55 03.80 +00 47 13.2           ~ 101 0
2 ACO 3376 ClG 06 01 25.000 -39 59 51.00           ~ 305 0
3 ACO 1240 ClG 11 23 37.7 +43 03 28           ~ 98 0
4 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 4803 2
5 BAX 199.3086-25.5133 ClG 13 14 25.4 -25 15 44           ~ 102 0
6 ACO 3667 ClG 20 12 33.68 -56 50 26.3           ~ 627 1
7 [BBG2010c] 1 G 21 26 33.96 -12 06 39.6           ~ 1 0
8 2MASX J21263466-1207214 G 21 26 34.6496460408 -12 07 21.931472028           ~ 2 0
9 [BBG2010c] 3 G 21 26 35.7831502632 -12 08 44.035900728           ~ 1 0
10 [BBG2010c] 4 G 21 26 36.84 -12 09 13.7           ~ 1 0
11 [BBG2010c] 5 G 21 26 37.58 -12 07 39.0           ~ 1 0
12 [BBG2010c] 6 G 21 26 38.30 -12 09 47.5           ~ 1 0
13 [BBG2010c] 7 G 21 26 39.6344644752 -12 06 18.835095312           ~ 1 0
14 [BGF2009] ACO 2345 X1 Rad 21 26 40.0 -12 07 00           ~ 1 0
15 [BBG2010c] 8 G 21 26 40.80 -12 07 45.1           ~ 1 0
16 [BBG2010c] 9 G 21 26 41.4982149936 -12 09 11.151881568           ~ 1 0
17 [BBG2010c] 10 G 21 26 42.58 -12 10 04.4           ~ 1 0
18 [BGF2009] ACO 2345-1 Rad 21 26 43.00 -12 07 50.0           ~ 4 0
19 [BBG2010c] 11 G 21 26 43.1932480152 -12 08 58.067742084           ~ 1 0
20 [BBG2010c] 12 G 21 26 44.06 -12 10 05.2           ~ 1 0
21 [BBG2010c] 13 G 21 26 44.9664234600 -12 06 28.975729824           ~ 1 0
22 [BBG2010c] 14 G 21 26 45.5474157240 -12 08 08.519325828           ~ 1 0
23 [BBG2010c] 15 G 21 26 47.3469352464 -12 07 02.316219960           ~ 1 0
24 [BBG2010c] 16 G 21 26 47.71 -12 09 38.9           ~ 1 0
25 [BBG2010c] 17 G 21 26 48.5074034880 -12 05 47.983958736           ~ 1 0
26 [BBG2010c] 18 G 21 26 48.94 -12 12 10.4           ~ 1 0
27 [BBG2010c] 19 G 21 26 49.6201614408 -12 08 05.858077020           ~ 1 0
28 [BBG2010c] 20 G 21 26 49.82 -12 11 38.4           ~ 1 0
29 [BBG2010c] 21 G 21 26 49.9984646880 -12 07 49.536696288           ~ 1 0
30 [BBG2010c] 22 G 21 26 51.12 -12 07 43.0           ~ 1 0
31 [BBG2010c] 23 G 21 26 51.46 -12 12 59.0           ~ 1 0
32 [BBG2010c] 24 G 21 26 52.18 -12 09 21.2           ~ 1 0
33 [BBG2010c] 25 G 21 26 52.3326835824 -12 08 43.787671728           ~ 1 0
34 [BBG2010c] 26 G 21 26 53.16 -12 08 31.2           ~ 1 0
35 [BBG2010c] 27 G 21 26 53.30 -12 10 27.5           ~ 1 0
36 [BBG2010c] 28 G 21 26 53.86 -12 08 50.6           ~ 1 0
37 [BBG2010c] 29 G 21 26 54.74 -12 06 28.1           ~ 1 0
38 [BBG2010c] 30 G 21 26 54.7542479304 -12 13 28.548256440           ~ 1 0
39 [BBG2010c] 31 G 21 26 55.2946463208 -12 06 26.663762268           ~ 1 0
40 [BBG2010c] 32 G 21 26 55.78 -12 10 26.0           ~ 1 0
41 [BBG2010c] 33 G 21 26 56.7960346728 -12 11 40.841487780           ~ 1 0
42 [BBG2010c] 34 G 21 26 56.86 -12 07 23.9           ~ 1 0
43 2MASX J21265722-1212492 rG 21 26 57.2288267112 -12 12 49.415424156           ~ 10 0
44 [BBG2010c] 36 G 21 26 57.3333396312 -12 08 42.315092628           ~ 1 0
45 [BBG2010c] 37 G 21 26 58.01 -12 08 28.7           ~ 1 0
46 [BBG2010c] 38 G 21 26 58.4397752496 -12 10 52.135118940           ~ 1 0
47 [BBG2010c] 39 G 21 26 58.87 -12 09 25.6           ~ 1 0
48 [BBG2010c] 40 G 21 26 59.1576086376 -12 10 06.151296936           ~ 1 0
49 [BBG2010c] 41 G 21 27 00.3680674800 -12 09 00.798288804           ~ 1 0
50 [BBG2010c] 42 G 21 27 01.06 -12 07 33.2           ~ 1 0
51 [BBG2010c] 43 G 21 27 01.1367520776 -12 10 53.748042456           ~ 1 0
52 [BBG2010c] 44 G 21 27 01.7683804152 -12 12 33.688733580           ~ 1 0
53 [BBG2010c] 45 G 21 27 01.82 -12 07 34.3           ~ 1 0
54 [BBG2010c] 46 G 21 27 02.1957364248 -12 12 58.180737168           ~ 1 0
55 [BBG2010c] 47 G 21 27 02.2713743208 -12 06 24.302199600           ~ 1 0
56 [BBG2010c] 48 G 21 27 02.5418932056 -12 09 53.781092640           ~ 1 0
57 [BBG2010c] 49 G 21 27 03.22 -12 08 34.4           ~ 1 0
58 [BBG2010c] 50 G 21 27 03.3503116704 -12 06 22.693161852           ~ 1 0
59 [BBG2010c] 51 G 21 27 03.6192131256 -12 12 45.026316612           ~ 1 0
60 [BBG2010c] 52 G 21 27 04.2006190128 -12 13 44.341005108           ~ 1 0
61 [BBG2010c] 53 G 21 27 04.30 -12 08 48.5           ~ 1 0
62 [BBG2010c] 54 G 21 27 04.6325261160 -12 09 57.547151748           ~ 1 0
63 [BBG2010c] 55 G 21 27 04.82 -12 11 57.1           ~ 1 0
64 ACO 2345 ClG 21 27 05.391 -12 09 07.41           ~ 131 0
65 [BBG2010c] 56 G 21 27 05.4724611600 -12 09 00.038560320           ~ 1 0
66 [BBG2010c] 57 G 21 27 06.24 -12 11 48.1           ~ 1 0
67 [BBG2010c] 58 G 21 27 06.5688505824 -12 08 27.029888952           ~ 1 0
68 [BBG2010c] 59 G 21 27 07.10 -12 08 25.8           ~ 1 0
69 [BBG2010c] 60 G 21 27 07.20 -12 14 14.3           ~ 1 0
70 [BBG2010c] 61 G 21 27 07.92 -12 09 00.0           ~ 1 0
71 [BBG2010c] 62 G 21 27 08.0574206928 -12 14 10.160074572           ~ 1 0
72 [BBG2010c] 63 G 21 27 08.2225179768 -12 07 07.928020344           ~ 1 0
73 [BBG2010c] 64 G 21 27 08.26 -12 10 27.1           ~ 1 0
74 [BBG2010c] 65 G 21 27 08.47 -12 12 24.1           ~ 1 0
75 [BBG2010c] 66 G 21 27 08.7373239768 -12 09 53.495491356           ~ 1 0
76 [BBG2010c] 67 G 21 27 08.86 -12 09 12.2           ~ 1 0
77 [BBG2010c] 68 G 21 27 08.98 -12 08 43.8           ~ 1 0
78 [BBG2010c] 69 G 21 27 09.10 -12 12 02.9           ~ 1 0
79 NVSS J212709-120958 Rad 21 27 09.5 -12 09 58           ~ 132 1
80 LEDA 956758 G 21 27 09.7223701536 -12 10 01.916430312           ~ 3 0
81 [BBG2010c] 71 G 21 27 10.0205481528 -12 15 04.088011500           ~ 1 0
82 [BBG2010c] 72 G 21 27 10.39 -12 11 23.3           ~ 1 0
83 [BBG2010c] 73 G 21 27 10.5454525560 -12 11 07.399244220           ~ 1 0
84 [BBG2010c] 74 G 21 27 10.7064442008 -12 08 16.477447632           ~ 1 0
85 [BBG2010c] 75 G 21 27 11.4000115008 -12 10 48.066976308           ~ 1 0
86 [BBG2010c] 76 G 21 27 12.0222091248 -12 09 54.648674820           ~ 2 0
87 [BBG2010c] 78 G 21 27 12.3853887120 -12 09 47.628125208           ~ 1 0
88 [BBG2010c] 77 G 21 27 12.4085604792 -12 09 21.307547268           ~ 1 0
89 [BBG2010c] 79 G 21 27 12.96 -12 10 03.0           ~ 1 0
90 [BBG2010c] 80 G 21 27 12.9971126184 -12 09 40.373529372           ~ 1 0
91 [BBG2010c] 81 G 21 27 13.03 -12 08 31.6           ~ 1 0
92 2MASX J21271372-1209462 BiC 21 27 13.7244351456 -12 09 46.297405260           ~ 6 0
93 [BBG2010c] 83 G 21 27 14.2045166640 -12 08 56.424363396           ~ 1 0
94 [BBG2010c] 84 G 21 27 14.40 -12 06 53.6           ~ 1 0
95 [BBG2010c] 85 G 21 27 14.59 -12 10 25.0           ~ 1 0
96 [BBG2010c] 86 G 21 27 14.7588046848 -12 06 24.193413396           ~ 1 0
97 [BBG2010c] 87 G 21 27 15.12 -12 08 54.6           ~ 1 0
98 [BBG2010c] 88 G 21 27 15.24 -12 12 45.7           ~ 1 0
99 [BBG2010c] 89 G 21 27 16.03 -12 13 05.2           ~ 1 0
100 [BBG2010c] 90 G 21 27 16.5806680512 -12 13 11.536047264           ~ 1 0
101 [BBG2010c] 91 G 21 27 16.7036691552 -12 07 08.370160932           ~ 1 0
102 [BBG2010c] 92 G 21 27 17.11 -12 09 38.9           ~ 1 0
103 [BBG2010c] 93 G 21 27 17.3526858168 -12 13 17.689850292           ~ 1 0
104 [BBG2010c] 94 G 21 27 17.86 -12 10 11.6           ~ 1 0
105 [BBG2010c] 95 G 21 27 18.2081926104 -12 09 44.891980452           ~ 1 0
106 [BBG2010c] 96 G 21 27 18.4072277568 -12 09 56.186749260           ~ 1 0
107 [BBG2010c] 97 G 21 27 18.48 -12 10 41.9           ~ 1 0
108 [BBG2010c] 98 G 21 27 18.91 -12 09 26.3           ~ 1 0
109 [BBG2010c] 99 G 21 27 19.80 -12 10 35.8           ~ 1 0
110 [BBG2010c] 100 G 21 27 19.8307767912 -12 09 40.372036020           ~ 1 0
111 [BBG2010c] 101 G 21 27 19.94 -12 09 47.5           ~ 1 0
112 [BBG2010c] 102 G 21 27 20.3653948824 -12 12 19.025842572           ~ 1 0
113 [BBG2010c] 103 G 21 27 21.07 -12 11 14.3           ~ 1 0
114 [BBG2010c] 104 G 21 27 21.36 -12 08 20.4           ~ 1 0
115 [BBG2010c] 105 G 21 27 22.44 -12 12 00.0           ~ 1 0
116 [BBG2010c] 106 G 21 27 23.33 -12 07 57.0           ~ 1 0
117 [BBG2010c] 107 G 21 27 23.38 -12 12 32.0           ~ 1 0
118 [BBG2010c] 108 G 21 27 23.54 -12 07 46.9           ~ 1 0
119 [BBG2010c] 109 G 21 27 23.8068640392 -12 12 48.915324108           ~ 1 0
120 [BBG2010c] 110 G 21 27 23.86 -12 09 13.7           ~ 1 0
121 [BBG2010c] 111 G 21 27 24.0306601272 -12 11 34.883054052           ~ 1 0
122 NVSS J212725-120623 Rad 21 27 25.08 -12 06 23.5           ~ 1 0
123 [BBG2010c] 112 G 21 27 25.30 -12 10 05.5           ~ 1 0
124 [BBG2010c] 113 G 21 27 25.58 -12 11 27.2           ~ 1 0
125 [BBG2010c] 114 G 21 27 25.99 -12 10 12.4           ~ 1 0
126 [BBG2010c] 115 G 21 27 26.50 -12 06 29.9           ~ 1 0
127 [BBG2010c] 116 G 21 27 27.1100912544 -12 08 58.430363208           ~ 1 0
128 [BBG2010c] 117 G 21 27 28.2184696944 -12 09 54.626876100           ~ 1 0
129 [BBG2010c] 118 G 21 27 28.3528303344 -12 07 31.683520128           ~ 1 0
130 [BBG2010c] 119 G 21 27 29.06 -12 09 31.3           ~ 1 0
131 [BBG2010c] 120 G 21 27 30.4287146400 -12 09 55.618460388           ~ 1 0
132 [BBG2010c] 121 G 21 27 31.94 -12 10 43.3           ~ 1 0
133 [BBG2010c] 122 G 21 27 32.9538732312 -12 08 03.459941016           ~ 1 0
134 [BBG2010c] 123 G 21 27 34.30 -12 09 32.8           ~ 1 0
135 [BBG2010c] 124 G 21 27 35.40 -12 10 14.5           ~ 1 0
136 [BGF2009] ACO 2345-2 Rad 21 27 36.00 -12 11 25.0           ~ 4 0
137 [BBG2010c] 125 G 21 27 36.10 -12 07 50.5           ~ 1 0
138 ZwCl 2341+0000 ClG 23 43 40.566 +00 18 18.94           ~ 70 0

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