2010MNRAS.404.1490F

Query : 2010MNRAS.404.1490F

2010MNRAS.404.1490F - Mon. Not. R. Astron. Soc., 404, 1490-1504 (2010/May-3)

The shapes of BCGs and normal ellipticals in nearby clusters.

FASANO G., BETTONI D., ASCASO B., TORMEN G., POGGIANTI B.M., VALENTINUZZI T., D'ONOFRIO M., FRITZ J., MORETTI A., OMIZZOLO A., CAVA A., MOLES M., DRESSLER A., COUCH W.J., KJAERGAARD P. and VARELA J.

Abstract (from CDS):

We compare the apparent axial ratio distributions of the brightest cluster galaxies (BCGs) and normal ellipticals (Es) in our sample of 75 galaxy clusters from the WIde-field Nearby Galaxy-cluster Survey (WINGS). Most BCGs in our clusters (69 per cent) are classified as cD galaxies. The sample of cDs has been completed by 14 additional cDs (non-BCGs) we found in our clusters. We deproject the apparent axial ratio distributions of Es, BCGs and cDs using a bivariate version of the Lucy rectification algorithm, whose results are supported by an independent Monte Carlo technique. Finally, we compare the intrinsic shape distribution of BCGs to the corresponding shape distribution of the central part of cluster-sized dark matter haloes extracted from the GIF2 Lambda cold dark matter (ΛCDM) N-body simulations (Gao et al.).

We find that (i) Es have triaxial shape, the triaxiality sharing almost evenly the intrinsic axial ratio parameter space, with a weak preference for prolateness and (ii) the BCGs have triaxial shape as well. However, their tendency towards prolateness is much stronger than in the case of Es. Such a strong prolateness appears entirely due to the sizeable (dominant) component of cDs inside the WINGS sample of BCGs. In fact, while the `normal' (non-cD) BCGs do not differ from Es, as far as the shape distribution is concerned, the axial ratio distribution of BCG{lowbar}cD galaxies is found to support quite prolate shapes; (III) our result turns out to be strongly at variance with the only similar previous analysis by Ryden, Lauer & Postman (RLP93), where BCGs and Es were found to share the same axial ratio distribution; (iv) our data suggest that the above discrepancy is mainly caused by the different criteria that RLP93 and ourselves use to select the cluster samples, coupled with a preference of cDs to reside in powerful X-ray-emitting clusters; (v) the GIF2 N-body results suggest that the prolateness of the BCGs (in particular the cDs) could reflect the shape of the associated dark matter haloes.


Abstract Copyright: © 2010 The Authors. Journal compilation © 2010 RAS

Journal keyword(s): galaxies: clusters: general - galaxies: elliptical and lenticular, cD - galaxies: general

VizieR on-line data: <Available at CDS (J/MNRAS/404/1490): table1.dat table2.dat>

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 115

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Number of rows : 115
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 ACO 2717 ClG 00 03 12.9 -35 56 13           ~ 146 0
2 ACO 2734 ClG 00 11 21.60 -28 51 16.6           ~ 156 0
3 ACO 85 ClG 00 41 36.21 -09 19 30.4           ~ 974 0
4 ACO 119 ClG 00 56 08.57 -01 12 00.8           ~ 577 2
5 Z 384-34 BiC 00 56 16.101 -01 15 19.77   14.40 14.45     ~ 82 1
6 BAX 014.7298+26.9591 ClG 00 58 54.2 +26 57 03           ~ 26 0
7 ACO 133 ClG 01 02 41.5 -21 52 53           ~ 391 1
8 ACO 147 ClG 01 08 10 +02 10.0           ~ 117 0
9 IC 77 rG 01 08 51.1070161776 -15 24 22.832614044   14.60   12.92   ~ 17 1
10 ACO 151 ClG 01 08 52.3 -15 25 01           ~ 199 1
11 Z 436-12 LIN 01 12 59.579 +15 29 28.71     15.7     ~ 91 1
12 ACO 160 ClG 01 12 59.98 +15 30 05.3           ~ 181 0
13 ACO 168 ClG 01 15 07.58 +00 19 10.8           ~ 379 2
14 ACO 193 ClG 01 25 07.3 +08 41 36           ~ 192 0
15 IC 1695 rG 01 25 07.645 +08 41 57.68   14.87       ~ 68 1
16 ACO 311 ClG 02 09 10 +19 43.2           ~ 46 0
17 ACO 376 ClG 02 45 48 +36 51.6           B8.5 161 1
18 MCG+06-07-004 BiC 02 46 03.9460542576 +36 54 18.840411612   15.50       ~ 46 1
19 ACO 3128 ClG 03 29 50.6 -52 34 48           ~ 183 3
20 ACO 3158 ClG 03 43 07.5 -53 38 09           ~ 327 0
21 ACO 3164 ClG 03 46 16.8 -57 02 11           ~ 47 0
22 2MASXI J0431133-612712 BiC 04 31 13.2952313064 -61 27 12.013455636   15.30   13.60   ~ 30 1
23 ACO 3266 ClG 04 31 26.4 -61 25 17           ~ 447 0
24 ACO 500 ClG 04 38 55.0 -22 05 55           ~ 89 0
25 [FMV2006] A548b ClG 05 45 28 -25 55.0           ~ 6 0
26 MCG-07-13-003 BiC 06 00 41.120 -40 02 39.82   14.66   12.93   ~ 48 1
27 ACO 3376 ClG 06 01 25.000 -39 59 51.00           ~ 334 0
28 LEDA 19057 LIN 06 26 49.5758024688 -54 32 34.581523416   15.83 16 13.52   ~ 50 1
29 ACO 3395 ClG 06 27 31.1 -54 23 58           ~ 229 0
30 ESO 161-8 BiC 06 27 36.2649635808 -54 26 57.926377896   15.02   12.72   ~ 37 0
31 ZwCl 0712+5334 ClG 07 16 42.6 +53 24 28           ~ 29 0
32 ACO 602 ClG 07 53 23.51 +29 20 20.3           ~ 80 0
33 IC 2378 BiC 08 28 31.64433 +30 25 52.7798   15.3       ~ 57 0
34 ACO 671 ClG 08 28 48.68 +30 27 07.0           ~ 168 0
35 2MASX J09083238-0937470 BiC 09 08 32.388 -09 37 47.06   14.32   13.32   ~ 41 2
36 ACO 754 ClG 09 09 14.8 -09 40 35           ~ 695 1
37 ACO 780 ClG 09 18 30 -12 15.7           ~ 469 0
38 NGC 3099 LIN 10 02 36.5352336744 +32 42 24.230041668   15.4       ~ 37 0
39 ZwCl 0959+3257 ClG 10 02 42.16 +32 43 37.2           ~ 41 0
40 Z 8-75 BiC 10 13 38.2582731024 -00 55 31.510821720   13.68       ~ 71 2
41 ACO 957 ClG 10 14 02.35 -00 53 30.0           ~ 225 2
42 2MASX J10172568-1041206 BiC 10 17 25.6982425920 -10 41 20.293861056   15.58   15.11   ~ 12 0
43 ACO 970 ClG 10 17 34.3 -10 42 01           ~ 93 0
44 BAX 155.5304+38.5153 ClG 10 22 18.24 +38 32 39.6           ~ 63 0
45 NGC 3219 rG 10 22 37.4145692616 +38 34 44.915885220   15.4       ~ 38 0
46 MCG-01-27-030 BiC 10 39 43.4485294608 -08 41 12.993909792   15   13.50   ~ 24 0
47 ACO 1069 ClG 10 39 54.3 -08 36 40           ~ 116 1
48 ACO 1291 ClG 11 32 11.20 +56 01 31.3           ~ 135 0
49 ACO 3490 ClG 11 45 19.6 -34 25 59           ~ 55 1
50 ACO 3497 ClG 12 00 03 -31 23.7           ~ 42 0
51 [FMV2006] A1631a ClG 12 52 52 -15 24.0           ~ 17 0
52 [FMV2006] A3528b ClG 12 54 00 -28 51.0           ~ 4 0
53 [FMV2006] A3528a ClG 12 54 35 -29 23.0           ~ 5 0
54 ACO 3530 ClG 12 55 36.0 -30 20 49           ~ 109 0
55 2MASX J12571157-1724344 LIN 12 57 11.580 -17 24 34.47   13.50   12.56   ~ 62 2
56 ACO 1644 ClG 12 57 11.6 -17 24 34           ~ 391 1
57 ACO 3532 ClG 12 57 19.2 -30 22 13           ~ 185 2
58 ACO 1668 ClG 13 04 00.60 +19 17 09.6           ~ 132 0
59 NVSS J132329-315041 rG 13 23 29.0181767136 -31 50 39.709744008   15.58   13.86 13.43 ~ 31 0
60 ACO 3556 ClG 13 24 06.2 -31 39 38           ~ 159 0
61 ACO 1736 ClG 13 26 52.1 -27 06 33           ~ 268 2
62 ACO 3558 ClG 13 28 03.2 -31 31 35           ~ 476 2
63 ACO 3560 ClG 13 32 23.7 -33 08 21           ~ 145 1
64 ACO 3562 ClG 13 33 31.8 -31 40 23           ~ 337 1
65 ACO 1795 ClG 13 48 47.4 +26 34 55           ~ 1330 0
66 Z 162-10 LIN 13 48 52.4892734448 +26 35 34.353002688   14.0       ~ 241 2
67 Z 162-41 BiC 13 59 15.0948648024 +27 58 34.489609500   12.7       ~ 31 1
68 ACO 1831 ClG 13 59 19.42 +27 58 08.2           ~ 166 0
69 Z 105-53 LIN 14 52 43.2586810440 +16 54 13.462211052   15.4       ~ 60 0
70 MCG+03-38-044 BiC 14 52 55.3114274784 +16 42 10.348432632   15       ~ 37 0
71 ACO 1983 ClG 14 52 59.33 +16 46 11.0           ~ 249 1
72 NGC 5778 rG 14 54 31.4984540808 +18 38 32.499862620   15.6       ~ 68 3
73 ACO 1991 ClG 14 54 41.53 +18 38 08.4           ~ 349 1
74 ACT-CL J1521.8+0742 ClG 15 21 48.8 +07 43 41     15.13     ~ 326 0
75 NGC 5920 LIN 15 21 51.870 +07 42 31.97   15.5       ~ 137 1
76 ACO 2107 ClG 15 39 39.04 +21 46 57.8           ~ 270 0
77 Z 136-44 BiC 15 39 39.049 +21 46 57.98   14.76       ~ 70 2
78 ACO 2122 ClG 15 44 55.93 +36 06 05.2           ~ 243 0
79 MCG+06-35-003 BiC 15 44 59.0328765384 +36 06 33.995660976   14.54       ~ 44 1
80 ACO 2149 ClG 16 00 53.08 +53 56 57.6           ~ 79 0
81 2MASX J16135804+4911228 BiC 16 13 58.0787970984 +49 11 22.551855180           ~ 29 0
82 ACO 2169 ClG 16 13 59.22 +49 07 07.2           ~ 64 0
83 ACO 2256 ClG 17 03 37.5 +78 37 23           ~ 928 1
84 ACO 2271 ClG 17 17 17.5 +78 01 00           ~ 70 0
85 BAX 265.1346+35.6492 ClG 17 40 32.7 +35 38 51           ~ 36 0
86 ZwCl 1810+4949 ClG 18 11 00.1 +49 54 40     14.8     ~ 60 0
87 ACO 3667 ClG 20 12 33.68 -56 50 26.3           ~ 676 1
88 ACO 3716 ClG 20 51 16.7 -52 41 43           ~ 123 1
89 Z 375-15 BiC 21 13 55.918 +02 33 55.39   15.1       ~ 67 1
90 IC 1365 GrG 21 14 03.6958 +02 34 14.568           ~ 52 0
91 ACO 3809 ClG 21 46 57.5 -43 54 06           ~ 99 0
92 2MASXI J2146590-435356 BiC 21 46 59.0803326096 -43 53 56.322516120   15.96       ~ 22 0
93 2MASX J21515562-1542218 BiC 21 51 55.6190222040 -15 42 21.512459592   15.27 15.4039793 13.74   ~ 20 0
94 ACO 2382 ClG 21 51 57.2984 -15 36 48.067           ~ 122 0
95 NVSS J215702-075032 rG 21 57 01.71856 -07 50 22.5450   15.64   14.33   ~ 44 1
96 ACO 2399 ClG 21 57 19.01 -07 50 57.5           ~ 197 0
97 ACO 2415 ClG 22 05 25.0 -05 35 23           ~ 124 1
98 ACO 3880 ClG 22 27 49.5 -30 34 40           ~ 104 2
99 ACO 2457 ClG 22 35 40.30 +01 31 33.6           ~ 139 0
100 2MASX J22354078+0129053 BiC 22 35 40.8012547920 +01 29 05.614773792   16.14 14.90     ~ 31 1
101 NGC 7499 GiP 23 10 22.3755357312 +07 34 50.600581536   15.0       ~ 50 0
102 ZwCl 2307+0713 ClG 23 10 26.6 +07 35 13           ~ 60 0
103 NGC 7578A BiC 23 17 11.9559390840 +18 42 04.204742004   15.3   13.54   ~ 45 0
104 [FMV2006] A2572a ClG 23 17 13 +18 42.0           ~ 10 0
105 NGC 7647 BiC 23 23 57.4310112528 +16 46 38.141670936   14.61 14.45     ~ 79 0
106 ACO 2589 ClG 23 24 00.5 +16 49 29           ~ 327 1
107 NGC 7649 rG 23 24 20.087 +14 38 49.68   15.65       ~ 62 1
108 ACO 2593 ClG 23 24 27.15 +14 33 40.2           ~ 231 0
109 ACO 2622 ClG 23 34 53 +27 25.6           ~ 93 0
110 4C 27.53A rG 23 35 01.4782510920 +27 22 20.679250476   15.28       ~ 50 1
111 WINGS J233630.49+210847.3 BiC 23 36 30.433 +21 08 45.60           ~ 6 0
112 ACO 2626 ClG 23 36 31.0 +21 09 36           ~ 265 0
113 ACO 2657 ClG 23 44 51.0 +09 08 40           ~ 280 3
114 ACO 2665 ClG 23 50 50.6 +06 09 00           ~ 106 0
115 ACO 4059 ClG 23 57 02.2 -34 45 58           ~ 400 1

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