2011MNRAS.413.1333W

Query : 2011MNRAS.413.1333W

2011MNRAS.413.1333W - Mon. Not. R. Astron. Soc., 413, 1333-1352 (2011/May-2)

The double galaxy cluster Abell 2465 – I. Basic properties: optical imaging and spectroscopy.

WEGNER G.A.

Abstract (from CDS):

Optical imaging and spectroscopic observations of the z= 0.245 double galaxy cluster Abell 2465 are described. This object appears to be undergoing a major merger. It is a double X-ray source and is detected in the radio at 1.4 GHz. The purpose of this paper is to investigate signatures of the interaction of the two components. Redshifts were measured to determine velocity dispersions and virial radii of each component. The technique of fuzzy clustering was used to assign membership weights to the galaxies in each clump. Using redshifts of 93 cluster members within 1.4 Mpc of the subcluster centres, the virial masses of the north-east (NE) and south-west (SW) components are Mv= 4.1±0.8 {x} 1014 and 3.8±0.8 {x} 1014 M☉, respectively. These agree within the errors with masses from X-ray scaling relations. The projected velocity difference between the two subclusters is 205±149 km.s–1. The anisotropy parameter, β, is found to be low for both components. Spectra of 37 per cent of the spectroscopically observed galaxies show emission lines and are predominantly star forming in the diagnostic diagram. No strong active galactic nucleus sources were found. The emission-line galaxies tend to lie between the two cluster centres with more near the SW clump. The luminosity functions of the two subclusters differ. The NE component is similar to many rich clusters, while the SW component has more faint galaxies. The NE clump's light profile follows a single Navarro-Frenk-White profile with c= 10 while the SW is better fitted with an extended outer region and a compact inner core, consistent with available X-ray data indicating that the SW clump has a cooling core. The observed differences and properties of the two components of Abell 2465 are interpreted to have been caused by a collision 2-4 Gyr ago, after which they have moved apart and are now near their apocentres, although the start of a merger remains a possibility. The number of emission-line galaxies gives weight to the idea that galaxy cluster collisions trigger star formation.

Abstract Copyright: 2011 The Author Monthly Notices of the Royal Astronomical Society2011 RAS

Journal keyword(s): galaxies: clusters: general - galaxies: clusters: individual: Abell 2465

Nomenclature: Table 2: [W2011] DDD.ddddd+DD.ddddd N=93+38+16.

Simbad objects: 152

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Number of rows : 152
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           ~ 811 0
2 MCS J0025.4-1222 ClG 00 25 29.381 -12 22 37.06           ~ 138 0
3 ZwCl 0024+1652 ClG 00 26 35.6 +17 09 32     18.35     ~ 635 1
4 ACO 85 ClG 00 41 36.21 -09 19 30.4           ~ 909 0
5 ACO 168 ClG 01 15 07.58 +00 19 10.8           ~ 360 2
6 ACO 399 ClG 02 57 56.4 +13 00 59           ~ 396 0
7 ACO 401 ClG 02 58 56.9 +13 34 56           ~ 566 0
8 ACO 3125 ClG 03 27 22 -53 30.6           ~ 56 2
9 ACO 521 ClG 04 54 08.6 -10 14 39           ~ 249 0
10 ACO 520 ClG 04 54 10.1 +02 55 38           ~ 436 0
11 ACO 3376 ClG 06 01 25.000 -39 59 51.00           ~ 305 0
12 ClG 0657-56 ClG 06 58 29.6 -55 56 39           ~ 963 1
13 NAME ACO 901-902 Supercluster SCG 09 56 -10.0           ~ 124 1
14 ACO 1367 ClG 11 44 44.6 +19 41 59           ~ 1076 1
15 ACO 1750 ClG 13 30 50.44 -01 51 27.1           ~ 178 2
16 ClG J1347-1145 ClG 13 47 30.5 -11 45 07           ~ 548 0
17 ACO 2146 ClG 15 56 04.7 +66 20 24           ~ 176 0
18 ACO 2163 ClG 16 15 46.1 -06 08 50           ~ 562 0
19 ACO 2219 ClG 16 40 22.1 +46 42 20           ~ 359 0
20 ACO 2256 ClG 17 03 09.4 +78 39 36           ~ 885 1
21 ACO 2345 ClG 21 27 05.391 -12 09 07.41           ~ 131 0
22 NVSS J212709-120958 Rad 21 27 09.5 -12 09 58           ~ 132 1
23 [W2011] 339.45346-06.18531 EmG 22 37 48.83 -06 11 07.1           ~ 1 0
24 [W2011] 339.47983-06.20242 EmG 22 37 55.16 -06 12 08.7           ~ 1 0
25 [W2011] 339.58828-05.93192 EmG 22 38 21.1619770416 -05 55 55.750062900           ~ 1 0
26 [W2011] 339.64358-05.61342 EmG 22 38 34.46 -05 36 48.3           ~ 1 0
27 [W2011] 339.64612-05.74183 EmG 22 38 35.07 -05 44 30.6           ~ 1 0
28 [W2011] 339.65378-06.16689 EmG 22 38 36.8974541976 -06 10 00.840462204           ~ 1 0
29 [W2011] 339.68289-05.83781 EmG 22 38 43.89 -05 50 16.1           ~ 1 0
30 [W2011] 339.68362-05.92178 EmG 22 38 44.07 -05 55 18.4           ~ 1 0
31 [W2011] 339.68655-05.88831 EmG 22 38 44.77 -05 53 17.9           ~ 1 0
32 [W2011] 339.69240-05.92532 EmG 22 38 46.18 -05 55 31.2           ~ 1 0
33 [W2011] 339.74338-05.94525 EmG 22 38 58.41 -05 56 42.9           ~ 1 0
34 [W2011] 339.75180-05.98858 EmG 22 39 00.43 -05 59 18.9           ~ 1 0
35 [W2011] 339.75809-05.79450 EmG 22 39 01.94 -05 47 40.2           ~ 1 0
36 [W2011] 339.76129-05.87131 EmG 22 39 02.7234739992 -05 52 17.611966524           ~ 1 0
37 [W2011] 339.76382-05.97494 EmG 22 39 03.32 -05 58 29.8           ~ 1 0
38 [W2011] 339.78149-05.75772 G 22 39 07.5574031616 -05 45 28.678376124           ~ 1 0
39 [W2011] 339.78741-05.62375 EmG 22 39 08.98 -05 37 25.5           ~ 1 0
40 [W2011] 339.79599-05.79644 EmG 22 39 11.04 -05 47 47.2           ~ 1 0
41 [W2011] 339.79696-05.83281 G 22 39 11.2554529200 -05 49 58.205545248           ~ 1 0
42 [W2011] 339.80219-05.78419 G 22 39 12.53 -05 47 03.1           ~ 1 0
43 [W2011] 339.80887-05.74450 EmG 22 39 14.13 -05 44 40.2           ~ 1 0
44 [W2011] 339.81299-05.75097 G 22 39 15.12 -05 45 03.5           ~ 1 0
45 [W2011] 339.81514-05.89681 EmG 22 39 15.63 -05 53 48.5           ~ 1 0
46 [W2011] 339.81662-05.79906 G 22 39 15.99 -05 47 56.6           ~ 1 0
47 [W2011] 339.82037-05.85808 EmG 22 39 16.89 -05 51 29.1           ~ 1 0
48 [W2011] 339.82141-05.70861 G 22 39 17.14 -05 42 31.0           ~ 1 0
49 [W2011] 339.82428-05.74400 G 22 39 17.83 -05 44 38.4           ~ 1 0
50 [W2011] 339.82657-05.40069 EmG 22 39 18.38 -05 24 02.5           ~ 1 0
51 [W2011] 339.82697-05.74289 G 22 39 18.47 -05 44 34.4           ~ 1 0
52 [W2011] 339.83499-05.73975 G 22 39 20.3452016280 -05 44 23.354922408           ~ 1 0
53 [W2011] 339.83484-05.82644 G 22 39 20.36 -05 49 35.2           ~ 1 0
54 [W2011] 339.83542-05.82269 G 22 39 20.4756750816 -05 49 21.836618832           ~ 1 0
55 [W2011] 339.83524-05.75508 G 22 39 20.4831272232 -05 45 18.536707368           ~ 1 0
56 [W2011] 339.83768-05.99783 EmG 22 39 21.04 -05 59 52.2           ~ 1 0
57 [W2011] 339.84021-05.82114 G 22 39 21.65 -05 49 16.1           ~ 1 0
58 [W2011] 339.84076-05.80964 G 22 39 21.78 -05 48 34.7           ~ 1 0
59 [W2011] 339.84326-05.75222 EmG 22 39 22.35 -05 45 07.9           ~ 1 0
60 [W2011] 339.84338-05.79100 G 22 39 22.41 -05 47 27.6           ~ 1 0
61 [W2011] 339.84662-05.75625 G 22 39 23.19 -05 45 22.5           ~ 1 0
62 [W2011] 339.84725-05.86158 G 22 39 23.3044515432 -05 51 42.439639824           ~ 1 0
63 [W2011] 339.84738-05.74164 EmG 22 39 23.3531162688 -05 44 29.817794760           ~ 2 0
64 [W2011] 339.84784-05.81222 G 22 39 23.5248884496 -05 48 43.727497272           ~ 2 0
65 [W2011] 339.85004-05.74921 GiC 22 39 24.01 -05 44 57.2           ~ 2 0
66 [W2011] 339.85074-06.20175 EmG 22 39 24.18 -06 12 06.3           ~ 1 0
67 BAX 339.8529-05.7844 ClG 22 39 24.4 -05 46 57           ~ 17 0
68 [W2011] 339.85236-05.78806 G 22 39 24.5704822440 -05 47 17.510665740           ~ 1 0
69 [W2011] 339.85291-05.78672 G 22 39 24.70 -05 47 12.2           ~ 1 0
70 [W2011] 339.85416-05.78444 GiC 22 39 25.0186448832 -05 47 04.440172128           ~ 2 0
71 [W2011] 339.85510-05.78122 EmG 22 39 25.22 -05 46 52.4           ~ 1 0
72 [W2011] 339.85526-05.78358 GiC 22 39 25.2248779584 -05 47 01.533716880           ~ 2 0
73 [W2011] 339.85626-05.78508 G 22 39 25.4949098832 -05 47 06.721399212           ~ 1 0
74 [W2011] 339.85654-05.78022 G 22 39 25.57 -05 46 48.8           ~ 1 0
75 [W2011] 339.85663-05.76189 EmG 22 39 25.61 -05 45 43.1           ~ 1 0
76 [W2011] 339.85699-05.89256 EmG 22 39 25.68 -05 53 33.2           ~ 1 0
77 [W2011] 339.85796-05.66972 G 22 39 25.9041610032 -05 40 11.642754576           ~ 1 0
78 [W2011] 339.85922-05.77811 GiC 22 39 26.21 -05 46 41.2           ~ 2 0
79 [W2011] 339.86432-05.88822 G 22 39 27.44 -05 53 17.6           ~ 1 0
80 [W2011] 339.86508-05.73889 EmG 22 39 27.62 -05 44 20.0           ~ 2 0
81 [W2011] 339.86609-05.79450 G 22 39 27.8915357568 -05 47 40.187852628           ~ 1 0
82 [W2011] 339.86731-05.76581 EmG 22 39 28.1551434768 -05 45 57.514496508           ~ 1 0
83 [W2011] 339.87332-05.80614 EmG 22 39 29.60 -05 48 22.1           ~ 1 0
84 [W2011] 339.87396-05.76278 GiC 22 39 29.75 -05 45 46.0           ~ 2 0
85 [W2011] 339.87462-05.69311 G 22 39 29.91 -05 41 35.2           ~ 1 0
86 ACO 2465 ClG 22 39 30 -05 44.3           ~ 11 0
87 [W2011] 339.88004-05.67217 G 22 39 31.21 -05 40 19.8           ~ 1 0
88 [W2011] 339.88025-05.56244 EmG 22 39 31.26 -05 33 44.8           ~ 1 0
89 [W2011] 339.88092-05.75026 G 22 39 31.42 -05 45 00.9           ~ 1 0
90 [W2011] 339.88293-05.68617 EmG 22 39 31.91 -05 41 10.2           ~ 1 0
91 [W2011] 339.88324-05.68225 G 22 39 31.9839729576 -05 40 56.242008156           ~ 1 0
92 [W2011] 339.88465-05.68619 EmG 22 39 32.2703689824 -05 41 10.343668668           ~ 1 0
93 [W2011] 339.88461-05.76603 EmG 22 39 32.3423462280 -05 45 58.365655200           ~ 1 0
94 [W2011] 339.88483-05.76292 EmG 22 39 32.36 -05 45 46.5           ~ 1 0
95 [W2011] 339.88586-05.68911 EmG 22 39 32.61 -05 41 20.8           ~ 1 0
96 [W2011] 339.88846-05.80075 EmG 22 39 33.23 -05 48 02.7           ~ 2 0
97 [W2011] 339.89172-05.60164 EmG 22 39 34.01 -05 36 05.9           ~ 1 0
98 [W2011] 339.89209-05.80678 G 22 39 34.10 -05 48 24.4           ~ 1 0
99 [W2011] 339.89420-05.81267 GiC 22 39 34.61 -05 48 45.6           ~ 2 0
100 [W2011] 339.89771-05.80597 EmG 22 39 35.45 -05 48 21.5           ~ 1 0
101 [W2011] 339.89879-05.69512 GiC 22 39 35.6846043552 -05 41 42.679464684           ~ 2 0
102 [W2011] 339.89868-05.82036 G 22 39 35.6964700872 -05 49 13.936114560           ~ 1 0
103 [W2011] 339.89908-05.82653 G 22 39 35.8360534176 -05 49 35.933119932           ~ 1 0
104 [W2011] 339.89958-05.70617 GiC 22 39 35.90 -05 42 22.2           ~ 2 0
105 [W2011] 339.90045-05.83003 EmG 22 39 36.11 -05 49 48.0           ~ 1 0
106 [W2011] 339.90379-05.75611 G 22 39 36.91 -05 45 22.0           ~ 1 0
107 [W2011] 339.90479-05.74742 EmG 22 39 37.15 -05 44 50.7           ~ 2 0
108 [W2011] 339.90482-05.67711 G 22 39 37.16 -05 40 37.6           ~ 1 0
109 [W2011] 339.90521-05.68931 G 22 39 37.25 -05 41 21.5           ~ 1 0
110 [W2011] 339.90805-05.72461 GiC 22 39 37.93 -05 43 28.6           ~ 2 0
111 [W2011] 339.90917-05.77036 G 22 39 38.20 -05 46 13.3           ~ 1 0
112 [W2011] 339.90931-05.77829 EmG 22 39 38.22 -05 46 41.8           ~ 1 0
113 [W2011] 339.90976-05.75339 GiC 22 39 38.34 -05 45 12.2           ~ 2 0
114 [W2011] 339.90982-05.73439 G 22 39 38.3488575120 -05 44 03.702376248           ~ 1 0
115 [W2011] 339.91043-05.69272 G 22 39 38.4974923560 -05 41 33.876965220           ~ 1 0
116 [W2011] 339.91147-05.81964 GiC 22 39 38.7566191560 -05 49 10.877141532           ~ 2 0
117 BAX 339.9121-05.7217 ClG 22 39 38.8 -05 43 13           ~ 20 0
118 [W2011] 339.91187-05.63333 G 22 39 38.8262256456 -05 38 00.281959440           ~ 1 0
119 [W2011] 339.91183-05.68417 GiC 22 39 38.84 -05 41 03.0           ~ 2 0
120 [W2011] 339.91226-05.83436 G 22 39 38.94 -05 50 03.7           ~ 1 0
121 [W2011] 339.91293-05.79492 GiC 22 39 39.0967873824 -05 47 41.667050832           ~ 2 0
122 [W2011] 339.91388-05.73789 GiC 22 39 39.33 -05 44 16.4           ~ 2 0
123 [W2011] 339.91403-05.73167 G 22 39 39.37 -05 43 54.0           ~ 1 0
124 [W2011] 339.91522-05.73214 GiC 22 39 39.6346146840 -05 43 55.575492528           ~ 2 0
125 [W2011] 339.91864-05.72389 GiC 22 39 40.479 -05 43 26.44           ~ 3 0
126 [W2011] 339.91916-05.72181 GiC 22 39 40.6099951032 -05 43 18.584682060           ~ 2 0
127 [W2011] 339.92083-05.73192 EmG 22 39 40.9804149096 -05 43 55.475600628           ~ 1 0
128 [W2011] 339.92203-05.73417 G 22 39 41.2919790720 -05 44 03.197899968           ~ 1 0
129 [W2011] 339.92871-05.74033 G 22 39 42.89 -05 44 25.2           ~ 1 0
130 [W2011] 339.92899-05.70703 G 22 39 42.96 -05 42 25.3           ~ 1 0
131 [W2011] 339.93253-05.72194 GiC 22 39 43.8459534648 -05 43 18.971894280           ~ 2 0
132 [W2011] 339.93542-05.67039 G 22 39 44.4502721592 -05 40 12.870980292           ~ 1 0
133 [W2011] 339.93524-05.67008 EmG 22 39 44.4502721592 -05 40 12.870980292           ~ 1 0
134 [W2011] 339.93896-05.75525 GiC 22 39 45.35 -05 45 18.9           ~ 2 0
135 [W2011] 339.93899-05.67408 EmG 22 39 45.36 -05 40 26.7           ~ 1 0
136 [W2011] 339.94089-05.71742 GiC 22 39 45.8293892376 -05 43 02.306510184           ~ 2 0
137 [W2011] 339.94403-05.65308 G 22 39 46.57 -05 39 11.1           ~ 1 0
138 [W2011] 339.94437-05.65339 EmG 22 39 46.65 -05 39 12.2           ~ 1 0
139 [W2011] 339.94528-05.76256 EmG 22 39 46.87 -05 45 45.2           ~ 2 0
140 [W2011] 339.94589-05.64414 G 22 39 47.01 -05 38 38.9           ~ 1 0
141 [W2011] 339.94791-05.62986 GiC 22 39 47.5017961320 -05 37 47.030796876           ~ 2 0
142 [W2011] 339.94891-05.62542 EmG 22 39 47.7184269768 -05 37 32.107966500           ~ 1 0
143 [W2011] 339.95475-05.79149 G 22 39 49.14 -05 47 29.4           ~ 1 0
144 [W2011] 339.96658-05.75661 GiC 22 39 51.9851063760 -05 45 23.623945488           ~ 2 0
145 [W2011] 339.96689-05.64408 G 22 39 52.05 -05 38 38.7           ~ 1 0
146 [W2011] 340.00000-05.73803 GiC 22 40 00.00 -05 44 16.9           ~ 2 0
147 [W2011] 340.06308-05.58347 EmG 22 40 15.14 -05 35 00.5           ~ 1 0
148 [W2011] 340.06516-05.62183 EmG 22 40 15.64 -05 37 18.6           ~ 1 0
149 [W2011] 340.10855-05.57439 EmG 22 40 26.05 -05 34 27.8           ~ 1 0
150 [W2011] 340.10977-05.80497 EmG 22 40 26.34 -05 48 17.9           ~ 1 0
151 [W2011] 340.12149-05.95319 EmG 22 40 29.16 -05 57 11.5           ~ 1 0
152 ACO 3921 ClG 22 49 59.0 -64 25 48           ~ 150 1

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