2009A&A...495...15B

Query : 2009A&A...495...15B

2009A&A...495...15B - Astronomy and Astrophysics, volume 495, 15-26 (2009/2-3)

Internal dynamics of the galaxy cluster Abell 959.

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 being debated. We aim to obtain new insights into the internal dynamics of Abell 959, showing evidence of a diffuse radio source, analyzing velocities and positions of member galaxies.Our analysis is based on redshift data for 107 galaxies in the cluster field acquired at the Telescopio Nazionale Galileo. We also use photometric data from the Sloan Digital Sky Survey (Data Release 6). We combine galaxy velocities and positions to select 81 galaxies recognized as cluster members and determine global dynamical properties. We analyze the cluster searching for substructures by using the weighted gap analysis, the KMM method and the Dressler-Shectman statistics. We also study the 2D galaxy distribution in the field of the cluster. We compare our results with those from X-ray and gravitational lensing analyses. We estimate a cluster redshift of <z≥0.2883±0.0004. We detect an NE high velocity group at 5' from the cluster center with a relative line-of-sight (LOS) velocity of ~+1900km/s with respect to the main system. We also detect a central, dense structure elongated along the SE-NW direction likely connected with the two dominant galaxies and their surrounding cores. This elongated central structure is probably the trace of an old cluster merger. The LOS velocity dispersion of galaxies is very high. By excluding the NE clump we obtain σV=1025–75+104km/s and a virial mass M(<R=1.48h70–1Mpc)=1.15–0.19+0.25x1015h70–1M☉. Our results suggest that this cluster is forming along two main directions of mass accretion.Abell 959 is confirmed to show the typical characteristics of radio clusters; i.e., it is very massive and shows a young dynamical state. However, deeper radio observations are needed to clarify the nature of the diffuse radio emission in Abell 959 and its connection with the cluster internal dynamics.

Abstract Copyright: ∼

Journal keyword(s): galaxies: clusters: individual: Abell 959 - galaxies: clusters: general - galaxies: distances and redshifts

VizieR on-line data: <Available at CDS (J/A+A/495/15): table1.dat>

Nomenclature: Table 1, Fig. 2: [BBG2009] NNN (Nos 1-107).

CDS comments: Paragraph.4 NVSS J101642+592222 is NVSS J101636+592210 in Simbad.

Simbad objects: 112

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Number of rows : 112
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 773 ClG 09 17 51.3 +51 43 20           ~ 295 0
3 NVSS J101636+592210 Rad 10 16 36.4 +59 22 09           ~ 2 0
4 SDSS J101653.19+593155.9 GiC 10 16 53.193 +59 31 55.92           ~ 1 0
5 SDSS J101654.24+593628.2 GiC 10 16 54.246 +59 36 28.25           ~ 1 0
6 SDSS J101655.79+593618.5 GiC 10 16 55.791 +59 36 18.50           ~ 1 0
7 [BBG2009] 4 GiC 10 16 57.214 +59 31 07.99           ~ 2 0
8 SDSS J101657.75+593255.7 GiC 10 16 57.7557666456 +59 32 55.755908376           ~ 1 0
9 SDSS J101658.65+593320.6 GiC 10 16 58.658 +59 33 20.60           ~ 1 0
10 SDSS J101700.01+593227.5 GiC 10 17 00.017 +59 32 27.56           ~ 1 0
11 [BBG2009] 8 GiC 10 17 01.542 +59 31 16.50           ~ 2 0
12 [BBG2009] 9 GiC 10 17 01.795 +59 30 42.67           ~ 2 0
13 SDSS J101704.69+593812.9 G 10 17 04.698 +59 38 12.94           ~ 1 0
14 [BBG2009] 11 GiC 10 17 07.362 +59 31 05.79           ~ 2 0
15 [BBG2009] 12 GiC 10 17 08.065 +59 33 34.56           ~ 2 0
16 SDSS J101708.37+593016.0 GiC 10 17 08.370 +59 30 16.08           ~ 1 0
17 SDSS J101709.95+593213.8 G 10 17 09.956 +59 32 13.84           ~ 1 0
18 SDSS J101710.25+593703.8 GiC 10 17 10.255 +59 37 03.82           ~ 1 0
19 [BBG2009] 16 GiC 10 17 13.3580038560 +59 35 20.443113708           ~ 2 0
20 SDSS J101713.69+593741.8 G 10 17 13.694 +59 37 41.87           ~ 1 0
21 [DPL2003] WL J1017.3+5931 ? 10 17 15.0 +59 30 46           ~ 3 0
22 SDSS J101715.97+593155.8 GiC 10 17 15.975 +59 31 55.80           ~ 1 0
23 SDSS J101716.35+593718.9 GiC 10 17 16.351 +59 37 18.96           ~ 1 0
24 SDSS J101717.61+593552.7 GiC 10 17 17.6060279928 +59 35 52.731408372           ~ 1 0
25 [BBG2009] 21 GiC 10 17 19.3631108736 +59 34 49.847083248           ~ 2 0
26 [BBG2009] 22 GiC 10 17 19.536 +59 34 57.14           ~ 2 0
27 [BBG2009] 23 GiC 10 17 19.5946125720 +59 34 25.725173124           ~ 2 0
28 [BBG2009] 24 GiC 10 17 20.539 +59 37 21.96           ~ 2 0
29 SDSS J101720.74+593558.7 G 10 17 20.742 +59 35 58.74           ~ 1 0
30 SDSS J101720.82+593108.6 G 10 17 20.8117042896 +59 31 08.598308736           ~ 1 0
31 [BBG2009] 27 GiC 10 17 21.992 +59 34 04.47           ~ 2 0
32 [BBG2009] 28 GiC 10 17 23.7646058904 +59 36 53.078897268           ~ 2 0
33 SDSS J101724.31+593019.9 G 10 17 24.310 +59 30 19.96           ~ 1 0
34 [BBG2009] 30 GiC 10 17 24.459 +59 37 13.55           ~ 2 0
35 SDSS J101725.00+593000.4 GiC 10 17 25.001 +59 30 00.40           ~ 1 0
36 [BBG2009] 32 GiC 10 17 25.2830323224 +59 31 10.040105460           ~ 1 0
37 SDSS J101726.11+593725.4 G 10 17 26.1099773112 +59 37 25.400329644           ~ 1 0
38 [BBG2009] 34 GiC 10 17 26.477 +59 37 55.82           ~ 2 0
39 [BBG2009] 35 GiC 10 17 27.502 +59 35 32.89           ~ 2 0
40 [BBG2009] 36 GiC 10 17 27.742 +59 35 47.16           ~ 2 0
41 [BBG2009] 37 GiC 10 17 27.868 +59 35 24.97           ~ 2 0
42 [BBG2009] 38 GiC 10 17 28.954 +59 35 24.62           ~ 2 0
43 SDSS J101729.34+593014.1 GiC 10 17 29.343 +59 30 14.19           ~ 1 0
44 SDSS J101729.56+593328.7 GiC 10 17 29.565 +59 33 28.77           ~ 1 0
45 [BBG2009] 41 GiC 10 17 29.944 +59 32 31.21           ~ 2 0
46 [BBG2009] 42 GiC 10 17 30.4708799712 +59 34 55.924875912           ~ 2 0
47 SDSS J101731.11+593659.5 G 10 17 31.112 +59 36 59.54           ~ 1 0
48 [BBG2009] 44 G 10 17 31.5250697496 +59 35 07.645388064           ~ 1 0
49 [BBG2009] 45 GiC 10 17 31.674 +59 33 54.49           ~ 2 0
50 SDSS J101731.95+593135.8 G 10 17 31.956 +59 31 35.84           ~ 1 0
51 [BBG2009] 47 GiC 10 17 32.0365745088 +59 32 36.828040668           ~ 2 0
52 [BBG2009] 48 GiC 10 17 32.1393885456 +59 34 24.084670692           ~ 2 0
53 [BBG2009] 49 GiC 10 17 32.7142155408 +59 30 45.295476444           ~ 2 0
54 SDSS J101732.91+593339.9 GiC 10 17 32.9042497296 +59 33 39.919281912           ~ 1 0
55 [BBG2009] 51 GiC 10 17 33.271 +59 35 12.11           ~ 2 0
56 [BBG2009] 52 GiC 10 17 33.5471981880 +59 34 32.700355536           ~ 2 0
57 2MASX J10173435+5933390 BiC 10 17 34.3351194168 +59 33 39.476362212   20.0       ~ 5 1
58 ACO 959 ClG 10 17 35.0 +59 33 28           ~ 68 0
59 [BBG2009] 54 GiC 10 17 35.4613946688 +59 34 14.389117140           ~ 2 0
60 SDSS J101735.48+593458.2 GiC 10 17 35.482 +59 34 58.25           ~ 1 0
61 [BBG2009] 56 BiC 10 17 35.9644221840 +59 34 01.563860892           ~ 3 0
62 [BBG2009] 57 GiC 10 17 36.052 +59 33 03.76           ~ 2 0
63 [BBG2009] 58 GiC 10 17 36.489 +59 33 16.81           ~ 2 0
64 [BBG2009] 59 GiC 10 17 36.655 +59 34 22.95           ~ 2 0
65 [BBG2009] 60 GiC 10 17 38.8315851696 +59 34 07.995682236           ~ 2 0
66 [BBG2009] 62 GiC 10 17 39.4699454760 +59 32 19.101443424           ~ 2 0
67 SDSS J101739.48+593137.9 GiC 10 17 39.481 +59 31 37.94           ~ 1 0
68 SDSS J101739.73+593123.7 G 10 17 39.7269888168 +59 31 23.761604388           ~ 1 0
69 [BBG2009] 64 GiC 10 17 39.901 +59 34 41.87           ~ 2 0
70 [BBG2009] 65 GiC 10 17 40.5633799944 +59 37 22.507796964           ~ 2 0
71 [BBG2009] 66 GiC 10 17 40.644 +59 34 50.81           ~ 2 0
72 [BBG2009] 67 GiC 10 17 41.098 +59 35 41.00           ~ 2 0
73 SDSS J101741.21+593237.0 GiC 10 17 41.210 +59 32 37.06           ~ 1 0
74 SDSS J101742.27+593253.5 BiC 10 17 42.277 +59 32 53.58           ~ 4 0
75 [BBG2009] 70 GiC 10 17 42.6317425512 +59 32 11.249521188           ~ 2 0
76 SDSS J101742.72+593609.7 GiC 10 17 42.727 +59 36 09.70           ~ 1 0
77 [BBG2009] 72 GiC 10 17 43.352 +59 30 56.91           ~ 2 0
78 SDSS J101743.86+593629.2 G 10 17 43.866 +59 36 29.21           ~ 1 0
79 [BBG2009] 74 GiC 10 17 44.223 +59 35 05.40           ~ 2 0
80 [BBG2009] 75 GiC 10 17 44.564 +59 33 58.86           ~ 2 0
81 SDSS J101744.61+593542.3 G 10 17 44.610 +59 35 42.34           ~ 1 0
82 2MASS J10174480+5933499 G 10 17 44.7631338432 +59 33 50.295244140   19.6       ~ 2 0
83 [BBG2009] 78 GiC 10 17 44.951 +59 32 55.80           ~ 2 0
84 SDSS J101745.00+593556.6 AG? 10 17 45.002 +59 35 56.68           ~ 2 0
85 [BBG2009] 80 GiC 10 17 45.9111725448 +59 34 18.195926412           ~ 2 0
86 [BBG2009] 81 GiC 10 17 46.002 +59 33 10.18           ~ 2 0
87 [BBG2009] 82 GiC 10 17 46.0149697200 +59 32 49.611872832           ~ 2 1
88 SDSS J101746.33+593633.1 GiC 10 17 46.336 +59 36 33.15           ~ 1 0
89 SDSS J101746.93+593634.2 GiC 10 17 46.936 +59 36 34.25           ~ 1 0
90 [BBG2009] 85 GiC 10 17 48.1341902328 +59 32 58.510649616           ~ 2 0
91 SDSS J101748.36+593433.5 GiC 10 17 48.365 +59 34 33.58           ~ 1 0
92 [BBG2009] 87 GiC 10 17 50.242 +59 34 34.91           ~ 2 0
93 [BBG2009] 88 GiC 10 17 50.3364928584 +59 35 16.265432796           ~ 3 0
94 SDSS J101750.78+593709.5 GiC 10 17 50.783 +59 37 09.52           ~ 1 0
95 SDSS J101750.85+593700.8 G 10 17 50.857 +59 37 00.86           ~ 1 0
96 SDSS J101752.45+593138.7 GiC 10 17 52.4406126432 +59 31 38.673293160           ~ 1 0
97 [BBG2009] 92 GiC 10 17 52.794 +59 32 45.36           ~ 2 0
98 [BBG2009] 93 GiC 10 17 53.212 +59 31 54.18           ~ 2 0
99 SDSS J101753.80+593150.5 G 10 17 53.805 +59 31 50.51           ~ 1 0
100 [BBG2009] 95 GiC 10 17 54.8953701120 +59 36 33.893407044           ~ 2 0
101 [BBG2009] 96 GiC 10 17 55.1087147352 +59 37 47.717578668           ~ 1 0
102 SDSS J101756.91+593018.8 GiC 10 17 56.919 +59 30 18.87           ~ 1 0
103 [BBG2009] 98 GiC 10 17 59.215 +59 35 34.66           ~ 2 0
104 [BBG2009] 99 GiC 10 17 59.9869629912 +59 36 17.262528624           ~ 2 0
105 [BBG2009] 100 GiC 10 18 00.5646544344 +59 33 36.418579848           ~ 2 0
106 SDSS J101800.84+593036.1 G 10 18 00.845 +59 30 36.18           ~ 1 0
107 SDSS J101803.09+593328.7 GiC 10 18 03.092 +59 33 28.70           ~ 1 0
108 SDSS J101805.45+593710.0 G 10 18 05.4530639640 +59 37 09.900300360           ~ 1 0
109 [BBG2009] 104 BiC 10 18 06.7056499656 +59 36 14.627233584           ~ 3 0
110 SDSS J101807.62+593608.5 GiC 10 18 07.624 +59 36 08.51           ~ 1 0
111 SDSS J101810.32+593647.5 GiC 10 18 10.328 +59 36 47.55           ~ 1 0
112 SDSS J101811.58+593541.9 G 10 18 11.5836186384 +59 35 41.889100848           ~ 1 0

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