2011A&A...536A..89G

Query : 2011A&A...536A..89G

2011A&A...536A..89G - Astronomy and Astrophysics, volume 536A, 89-89 (2011/12-1)

Internal dynamics of Abell 2254: a merging galaxy cluster with a clumpy, diffuse radio emission.

GIRARDI M., BARDELLI S., BARRENA R., BOSCHIN W., GASTALDELLO F. and NONINO M.

Abstract (from CDS):

The mechanisms giving rise to diffuse radio emission in galaxy clusters and, in particular, their connection with cluster mergers are still being debated. We explore the internal dynamics of Abell 2254, which has been shown to host a very clumpy and irregular radio halo. Our analysis is mainly based on redshift data for 128 galaxies acquired at the Telescopio Nazionale Galileo. We combined galaxy velocities and positions to select 110 cluster galaxies and analyze its internal dynamics. We also used new (g', r', i') photometric data acquired at the Isaac Newton Telescope, and (V, i') photometric data available in the Subaru Archive. X-ray data from the XMM-Newton Science Archive were analyzed to study the hot gas component.We estimate the cluster redshift <z≥0.177, a high line-of-sight (LOS) velocity dispersion, σV∼1350km/s, and the X-ray temperature kT∼6.4keV. Both our optical and X-ray analyses reveal complex dynamical activity. The analysis of the 2D galaxy distribution reveals the presence of two density peaks, one to the east and the other to the west (E and W peaks). Using the full 3D information we detect a high-velocity (ΔVrf,LOS∼3000km/s), low-mass (σV∼200-500km/s) group at the position of the 2D E peak. For the main system we compute a velocity dispersion σV∼1000-1200km/s. In the assumption of a bimodal system we estimate a mass Msys=1.5-2.9x1015h70–1M☉. The X-ray morphological analysis, which is based on power ratios, centroid shifts, and concentration parameter, confirms that Abell 2254 is a dynamically disturbed cluster. The X-ray isophotes are elongated in the east direction, in agreement with a merger in the post core-crossing phase. A simple bimodal model finds that data are consistent with a bound, outgoing subcluster observed a few fractions of Gyr after the core crossing. However, both optical and X-ray analyses suggest that the main system is, in turn, a nonrelaxed structure, indicating north-south as a possible direction for a past accretion. We conclude that Abell 2254, for its mass and merging structure, fits well among the typical clusters with radio halos. We briefly discuss how the particular irregularity of the radio halo might be linked to the complexity of the Abell 2254 structure.

Abstract Copyright: ∼

Journal keyword(s): X-rays: galaxies: clusters - galaxies: kinematics and dynamics - galaxies: clusters: general - galaxies: clusters: individual: Abell 2254

VizieR on-line data: <Available at CDS (J/A+A/536/A89): table1.dat>

Nomenclature: Table 1: [GBB2011b] NNN (Nos 1-128).

Simbad objects: 139

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Number of rows : 139
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 ACO 2744 ClG 00 14 20.03 -30 23 17.8           ~ 813 0
2 ACO 520 ClG 04 54 10.1 +02 55 38           ~ 436 0
3 ACO 665 ClG 08 30 45.2 +65 52 55           ~ 437 0
4 ACO 754 ClG 09 09 08.4 -09 39 58           ~ 666 1
5 SA 108- reg 16 32 08 +00 22.1           ~ 8 0
6 ACO 2256 ClG 17 03 09.4 +78 39 36           ~ 885 1
7 ACT-CL J1716.5+1935 ClG 17 16 27.87 +19 34 56.4           ~ 5 0
8 [GBB2011b] 1 G 17 17 24.5975523984 +19 41 59.514525888           ~ 1 0
9 [GBB2011b] 2 G 17 17 25.9002422184 +19 39 54.568366236           ~ 1 0
10 [GBB2011b] 3 G 17 17 25.9187551128 +19 43 24.724836264           ~ 1 0
11 [GBB2011b] 4 G 17 17 26.2023051984 +19 42 20.366381016           ~ 1 0
12 [GBB2011b] 5 G 17 17 26.5622839920 +19 41 31.306767072           ~ 1 0
13 [GBB2011b] 6 G 17 17 27.6005712864 +19 42 14.690886768           ~ 1 0
14 [GBB2011b] 7 G 17 17 28.94 +19 40 18.1           ~ 1 0
15 [GBB2011b] 8 G 17 17 30.0810154752 +19 43 29.891455500           ~ 1 0
16 [GBB2011b] 9 G 17 17 31.6667969040 +19 42 06.112148616           ~ 1 0
17 [GBB2011b] 10 G 17 17 32.35 +19 43 13.4           ~ 1 0
18 [GBB2011b] 11 G 17 17 33.5136716568 +19 41 07.182997728           ~ 1 0
19 [GBB2011b] 12 G 17 17 33.5218722312 +19 42 42.108109200           ~ 1 0
20 [GBB2011b] 13 G 17 17 34.3403372376 +19 42 48.670357644           ~ 1 0
21 [GBB2011b] 14 G 17 17 35.35 +19 42 42.8           ~ 1 0
22 [GBB2011b] 15 G 17 17 35.8908599616 +19 39 27.156666096           ~ 1 0
23 [GBB2011b] 16 G 17 17 36.4407125712 +19 41 07.782032040           ~ 1 0
24 [GBB2011b] 17 G 17 17 36.4613338368 +19 39 01.984396248           ~ 1 0
25 [GBB2011b] 18 G 17 17 36.6917157189 +19 42 03.202259176           ~ 1 0
26 [GBB2011b] 19 G 17 17 37.0122401208 +19 41 11.115057228           ~ 1 0
27 [GBB2011b] 20 G 17 17 37.8701575752 +19 41 17.740880772           ~ 1 0
28 [GBB2011b] 22 G 17 17 38.0339863008 +19 44 55.642722144           ~ 1 0
29 [GBB2011b] 21 G 17 17 38.04 +19 40 04.4           ~ 1 0
30 [GBB2011b] 23 G 17 17 38.21 +19 40 03.7           ~ 1 0
31 [GBB2011b] 24 G 17 17 38.26 +19 38 46.3           ~ 1 0
32 [GBB2011b] 25 G 17 17 38.9502047280 +19 40 01.585356168           ~ 1 0
33 [GBB2011b] 26 G 17 17 39.1230312576 +19 41 32.936506836           ~ 1 0
34 [GBB2011b] 27 G 17 17 39.65 +19 41 06.7           ~ 1 0
35 [GBB2011b] 28 G 17 17 39.70 +19 38 02.8           ~ 1 0
36 [GBB2011b] 29 G 17 17 39.8283457968 +19 38 10.502646252           ~ 1 0
37 [GBB2011b] 30 G 17 17 39.8283457968 +19 38 10.502646252           ~ 1 0
38 [GBB2011b] 31 G 17 17 40.0188306336 +19 40 51.889850760           ~ 1 0
39 [GBB2011b] 32 G 17 17 40.63 +19 37 42.6           ~ 1 0
40 [GBB2011b] 33 G 17 17 40.6429135392 +19 41 40.821003312           ~ 1 0
41 [GBB2011b] 34 G 17 17 40.68 +19 39 52.2           ~ 1 0
42 [GBB2011b] 35 G 17 17 41.02 +19 43 53.8           ~ 1 0
43 [GBB2011b] 36 G 17 17 41.3259989832 +19 39 51.723177876           ~ 1 0
44 [GBB2011b] 37 G 17 17 41.38 +19 41 42.0           ~ 1 0
45 [GBB2011b] 38 G 17 17 41.5168397352 +19 41 07.576903392           ~ 1 0
46 [GBB2011b] 39 G 17 17 42.3849463944 +19 42 38.992376304           ~ 1 0
47 [GBB2011b] 40 G 17 17 42.9970249776 +19 42 26.083578348           ~ 1 0
48 [GBB2011b] 41 G 17 17 43.0683869280 +19 41 43.844013528           ~ 1 0
49 [GBB2011b] 42 G 17 17 43.0689304944 +19 43 51.799797912           ~ 1 0
50 [GBB2011b] 43 G 17 17 43.1956151280 +19 44 59.345619720           ~ 1 0
51 [GBB2011b] 44 G 17 17 43.5994308264 +19 39 20.369273436           ~ 1 0
52 [GBB2011b] 45 G 17 17 43.6036280544 +19 42 42.132314484           ~ 1 0
53 [GBB2011b] 46 G 17 17 43.63 +19 38 37.7           ~ 1 0
54 [GBB2011b] 47 G 17 17 43.70 +19 39 24.8           ~ 1 0
55 [GBB2011b] 48 G 17 17 43.8094739088 +19 41 12.088723632           ~ 1 0
56 [GBB2011b] 49 G 17 17 43.8769895592 +19 41 43.088152380           ~ 1 0
57 [GBB2011b] 50 G 17 17 45.5268804120 +19 40 39.741570696           ~ 1 0
58 [GBB2011b] 51 G 17 17 45.62 +19 41 57.1           ~ 1 0
59 [GBB2011b] 52 G 17 17 45.6640613640 +19 38 13.374830652           ~ 1 0
60 [GBB2011b] 55 G 17 17 45.8577106704 +19 40 46.151329224           ~ 1 0
61 2MASX J17174586+1940482 GiC 17 17 45.864 +19 40 48.29           ~ 5 1
62 [GBB2011b] 54 G 17 17 45.8855566200 +19 41 47.275635624           ~ 1 0
63 ACO 2254 ClG 17 17 45.90 +19 40 22.8           ~ 69 0
64 [GBB2011b] 56 G 17 17 45.9092072328 +19 39 40.956244776           ~ 1 0
65 [GBB2011b] 57 G 17 17 46.2790864872 +19 42 20.963124576           ~ 1 0
66 [GBB2011b] 58 G 17 17 46.5703098264 +19 42 42.143417676           ~ 1 0
67 [GBB2011b] 59 G 17 17 46.5955394304 +19 40 06.090961116           ~ 1 0
68 [GBB2011b] 60 G 17 17 46.75 +19 40 30.7           ~ 1 0
69 [GBB2011b] 61 G 17 17 46.9727901720 +19 39 31.046911776           ~ 1 0
70 [GBB2011b] 62 G 17 17 47.59 +19 41 29.4           ~ 1 0
71 [GBB2011b] 63 G 17 17 47.69 +19 44 15.4           ~ 1 0
72 [GBB2011b] 64 G 17 17 47.7972705504 +19 41 35.757227688           ~ 1 0
73 [GBB2011b] 65 G 17 17 47.95 +19 37 00.8           ~ 1 0
74 [GBB2011b] 66 G 17 17 48.0252348504 +19 38 51.261370332           ~ 1 0
75 [GBB2011b] 67 G 17 17 49.7874253632 +19 41 10.449094704           ~ 1 0
76 [GBB2011b] 68 G 17 17 49.82 +19 41 18.2           ~ 1 0
77 LEDA 1600508 G 17 17 50.0295909288 +19 39 07.515425268           ~ 2 0
78 [GBB2011b] 70 G 17 17 50.8088164752 +19 41 43.394328060           ~ 1 0
79 [GBB2011b] 71 G 17 17 50.9902438032 +19 41 12.226235388           ~ 1 0
80 [GBB2011b] 72 G 17 17 51.2197422912 +19 42 38.110593888           ~ 1 0
81 [GBB2011b] 73 G 17 17 51.4960911024 +19 40 35.959192140           ~ 1 0
82 [GBB2011b] 74 G 17 17 51.5866296984 +19 42 53.073373284           ~ 1 0
83 [GBB2011b] 75 G 17 17 51.6668038440 +19 41 20.260250556           ~ 1 0
84 [GBB2011b] 76 G 17 17 52.1343152040 +19 40 19.390708200           ~ 1 0
85 [GBB2011b] 77 G 17 17 52.6021713408 +19 40 07.297039812           ~ 1 0
86 [GBB2011b] 78 G 17 17 53.0563423848 +19 44 23.914179276           ~ 1 0
87 [GBB2011b] 79 G 17 17 53.2182429768 +19 38 47.830737084           ~ 1 0
88 [GBB2011b] 80 G 17 17 53.5297188168 +19 40 24.764706228           ~ 1 0
89 [GBB2011b] 81 G 17 17 54.1187985312 +19 41 47.916790548           ~ 1 0
90 [GBB2011b] 82 G 17 17 54.17 +19 43 36.1           ~ 1 0
91 [GBB2011b] 83 G 17 17 54.8528544144 +19 38 14.214560712           ~ 1 0
92 [GBB2011b] 84 G 17 17 54.9336682344 +19 39 04.136456448           ~ 1 0
93 [GBB2011b] 85 G 17 17 54.96 +19 39 29.2           ~ 1 0
94 [GBB2011b] 86 G 17 17 55.0768597488 +19 40 15.728927412           ~ 1 0
95 [GBB2011b] 87 G 17 17 55.0772650296 +19 42 10.664129412           ~ 1 0
96 [GBB2011b] 88 G 17 17 55.0954936056 +19 41 10.639790556           ~ 1 0
97 [GBB2011b] 89 G 17 17 55.46 +19 37 52.0           ~ 1 0
98 [GBB2011b] 90 G 17 17 55.75 +19 41 53.2           ~ 1 0
99 [GBB2011b] 92 G 17 17 55.78 +19 40 36.8           ~ 1 0
100 [GBB2011b] 91 G 17 17 55.7960859000 +19 39 41.122581732           ~ 1 0
101 [GBB2011b] 93 G 17 17 56.0094610584 +19 40 59.571881184           ~ 1 0
102 [GBB2011b] 94 G 17 17 56.09 +19 42 14.4           ~ 1 0
103 [GBB2011b] 95 G 17 17 56.3152061784 +19 39 54.220156668           ~ 1 0
104 [GBB2011b] 96 G 17 17 56.42 +19 41 43.4           ~ 1 0
105 [GBB2011b] 97 G 17 17 56.5253142432 +19 37 59.491183764           ~ 1 0
106 [GBB2011b] 98 G 17 17 56.6317210800 +19 42 56.517277140           ~ 1 0
107 [GBB2011b] 99 G 17 17 56.9574136104 +19 41 21.211235628           ~ 1 0
108 [GBB2011b] 100 G 17 17 57.1012280184 +19 41 28.687991208           ~ 1 0
109 [GBB2011b] 101 G 17 17 57.19 +19 37 23.5           ~ 1 0
110 [GBB2011b] 102 G 17 17 57.2887311864 +19 39 35.244366480           ~ 1 0
111 [GBB2011b] 103 G 17 17 57.3098203728 +19 41 52.390677696           ~ 1 0
112 [GBB2011b] 104 G 17 17 57.5243382912 +19 43 51.843124524           ~ 1 0
113 [GBB2011b] 105 G 17 17 57.6784231800 +19 43 42.041716536           ~ 1 0
114 [GBB2011b] 106 G 17 17 57.84 +19 43 28.9           ~ 1 0
115 [GBB2011b] 107 G 17 17 58.1257436304 +19 38 38.879986128           ~ 1 0
116 [GBB2011b] 109 G 17 17 58.20 +19 40 36.5           ~ 1 0
117 [GBB2011b] 108 G 17 17 58.2098364048 +19 36 45.390750156           ~ 1 0
118 [GBB2011b] 110 G 17 17 59.2140159792 +19 37 22.894821156           ~ 1 0
119 [GBB2011b] 111 G 17 17 59.2212964536 +19 40 45.114694752           ~ 1 0
120 LEDA 1601342 G 17 17 59.69 +19 40 25.7           ~ 2 0
121 [GBB2011b] 113 G 17 17 59.83 +19 42 09.0           ~ 1 0
122 [GBB2011b] 114 G 17 17 59.98 +19 40 54.1           ~ 1 0
123 [GBB2011b] 115 G 17 18 00.58 +19 43 44.8           ~ 1 0
124 [GBB2011b] 116 G 17 18 00.67 +19 40 00.1           ~ 1 0
125 LEDA 1601699 G 17 18 01.3034606040 +19 40 58.407403332           ~ 2 0
126 [GBB2011b] 118 G 17 18 01.7313690504 +19 39 28.559846052           ~ 1 0
127 [GBB2011b] 119 G 17 18 01.9749612744 +19 40 22.321983360           ~ 1 0
128 [GBB2011b] 120 G 17 18 01.99 +19 37 56.6           ~ 1 0
129 [GBB2011b] 121 G 17 18 03.3271830504 +19 42 09.369330732           ~ 1 0
130 [GBB2011b] 122 G 17 18 03.4737800952 +19 36 13.918190796           ~ 1 0
131 [GBB2011b] 123 G 17 18 03.6404032512 +19 37 33.822605928           ~ 1 0
132 [GBB2011b] 124 G 17 18 04.4922283416 +19 40 21.242911404           ~ 1 0
133 [GBB2011b] 125 G 17 18 04.61 +19 39 22.3           ~ 1 0
134 [GBB2011b] 126 G 17 18 06.00 +19 39 55.1           ~ 1 0
135 [GBB2011b] 127 G 17 18 06.0646060248 +19 38 17.504570940           ~ 1 0
136 [GBB2011b] 128 G 17 18 07.51 +19 37 40.8           ~ 1 0
137 ACO 2345 ClG 21 27 05.391 -12 09 07.41           ~ 131 0
138 NVSS J212709-120958 Rad 21 27 09.5 -12 09 58           ~ 132 1
139 ACO 2554 ClG 23 12 20.0 -21 29 50           ~ 94 1

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