2016A&A...595A.119M


Query : 2016A&A...595A.119M

2016A&A...595A.119M - Astronomy and Astrophysics, volume 595A, 119-119 (2016/11-1)

Testing the two planes of satellites in the Centaurus group.

MULLER O., JERJEN H., PAWLOWSKI M.S. and BINGGELI B.

Abstract (from CDS):

Context. The existence of satellite galaxy planes poses a major challenge for the standard picture of structure formation with non-baryonic dark matter. Recently Tully et al. (2015ApJ...802L..25T) reported the discovery of two almost parallel planes in the nearby Cen A group using mostly high-mass galaxies (MB< -10mag) in their analysis.
Aims. Our team detected a large number of new group member candidates in the Cen A group. This dwarf galaxy sample, combined with other recent results from the literature, enables us to test the galaxy distribution in the direction of the Cen A group and to determine the statistical significance of the geometric alignment.
Methods. Taking advantage of the fact that the two galaxy planes lie almost edge-on along the line of sight, the newly found group members can be assigned relative to the two planes. We used various statistical methods to test whether the distribution of galaxies follows a single normal distribution or shows evidence of bimodality as has been reported earlier.
Results. We confirm that the data used for the Tully et al. (2015ApJ...802L..25T) study support the picture of a bimodal structure. When the new galaxy samples are included, however, the gap between the two galaxy planes is closing and the significance level of the bimodality is reduced. Instead, the plane that contains Cen A becomes more prominent.
Conclusions. We found evidence that the galaxy system around Cen A is made up of only one plane of satellites. This plane is almost orthogonal to the dust plane of Cen A. Accurate distances to the new dwarf galaxies will be required to measure the precise 3D distribution of the galaxies around Cen A.

Abstract Copyright: © ESO, 2016

Journal keyword(s): galaxies: dwarf - galaxies: groups: individual: Cen A (NGC 5128) - galaxies: individual: Cen A (NGC 5128) - large-scale structure of Universe

Nomenclature: Table 2: [MJB2015] dwHHMM+DDa N=16 added.

Simbad objects: 70

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Number of rows : 70
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12095 1
2 NAME M 81-82 Group GrG 09 55 +69.1           ~ 689 0
3 ESO 321-14 G 12 13 49.6 -38 13 52 16.32 15.70 15.35 15.20 15.2 ~ 81 0
4 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6377 0
5 LEDA 2815819 G 12 44 21.5 -42 56 23   16.7       ~ 13 0
6 ACO 3526 ClG 12 48 51.8 -41 18 21           ~ 1034 2
7 ESO 269-37 G 13 03 33.6 -46 35 05   16.29   14.95   ~ 42 1
8 NGC 4945 Sy2 13 05 27.279 -49 28 04.44   9.31 14.40 7.55   ~ 1398 2
9 MCG-04-31-038 EmG 13 09 36.6 -27 08 26   14.5   16.01 14.7 ~ 22 0
10 ESO 269-58 G 13 10 32.9 -46 59 27   12.50   11.31   ~ 68 0
11 LEDA 2815820 G 13 11 14.1 -38 54 22   17.3       ~ 15 0
12 LEDA 166158 G 13 12 45.2 -41 49 57   19.3       ~ 35 0
13 ESO 269-66 GiC 13 13 09.2 -44 53 23   14.14       ~ 57 0
14 ESO 269-68 GiC 13 13 11.9 -43 15 55   14.25       ~ 26 1
15 [MJB2015] dw1315-45 LSB 13 15 56.0 -45 45 02           ~ 5 0
16 [MJB2015] dw1318-44 LSB 13 18 58.0 -44 53 41           ~ 4 0
17 [CSC2014] CenA-MM-Dw5 G 13 19 52.4 -41 59 38           ~ 7 0
18 NAME Cen A Group GrG 13 20 33.9 -44 58 51           ~ 253 0
19 LEDA 2815821 G 13 21 32.4 -31 53 11   17.6       ~ 18 0
20 [CSC2014] CenA-MM-Dw11 G? 13 21 40.1 -43 04 57           ~ 5 0
21 LEDA 46663 G 13 21 47.1 -45 03 41           ~ 56 0
22 NGC 5102 EmG 13 21 57.6100832352 -36 37 48.395156160   9.74 9.65 8.47 10.2 ~ 352 1
23 LEDA 46680 G 13 22 02.1 -42 32 10   16.6       ~ 53 0
24 LEDA 2815822 G 13 22 12.7 -42 43 41   18.5       ~ 35 0
25 [MJB2015] dw1322-39 LSB 13 22 32.0 -39 54 22           ~ 6 0
26 LEDA 166164 G 13 22 56.2 -33 34 22   17.6       ~ 25 0
27 [CSC2014] CenA-MM-Dw4 G 13 23 02.6 -41 47 11           ~ 6 0
28 [MJB2015] dw1323-40c LSB 13 23 37.0 -40 43 17           ~ 4 0
29 [MJB2015] dw1323-40b LSB 13 23 55.0 -40 50 09           ~ 6 0
30 [CSC2014] CenA-MM-Dw12 G? 13 24 10.9 -42 08 23           ~ 3 0
31 [MJB2015] dw1323-40 LSB 13 24 53.0 -40 45 41           ~ 6 0
32 NAME Centaurus A Sy2 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4319 3
33 [CSC2014] CenA-MM-Dw6 G 13 25 57.7 -41 05 39           ~ 6 0
34 [MJB2015] dw1326-37 LSB 13 26 22.0 -37 23 08           ~ 3 0
35 [CSC2014] CenA-MM-Dw7 G 13 26 28.7 -43 33 25           ~ 6 0
36 [CSC2014] CenA-MM-Dw10 G? 13 26 49.2 -43 00 00           ~ 5 0
37 LEDA 166167 G 13 27 27.8 -45 21 10           ~ 25 0
38 ESO 324-24 LSB 13 27 38.8 -41 28 47   12.91   12.13 12.3 ~ 95 0
39 [MJB2015] dw1329-45 LSB 13 29 10.0 -45 10 31           ~ 4 0
40 [CSC2014] CenA-MM-Dw13 G? 13 29 51.7 -43 31 10           ~ 3 0
41 [CSC2014] CenA-MM-Dw2 G 13 29 57.34 -41 52 22.6           ~ 10 0
42 [CSC2014] CenA-MM-Dw1 G 13 30 14.26 -41 53 35.8           ~ 11 0
43 [CSC2014] CenA-MM-Dw3 G 13 30 21.5 -42 11 33           ~ 14 0
44 [MJB2015] dw1330-38 G? 13 30 41.0 -38 10 03           ~ 2 0
45 [MJB2015] dw1331-40 G? 13 31 26.0 -40 15 47           ~ 2 0
46 [MJB2015] dw1331-37 LSB 13 31 32.0 -37 03 29           ~ 4 0
47 [CSC2014] CenA-MM-Dw9 G 13 33 01.5 -42 31 49           ~ 6 0
48 [CSC2014] CenA-MM-Dw8 G 13 33 34.1 -41 36 29           ~ 6 0
49 NGC 5206 GiG 13 33 43.9615937880 -48 09 03.953598228   11.62   10.40   ~ 100 0
50 [MJB2015] dw1336-44 LSB 13 36 44.0 -44 26 50           ~ 4 0
51 M 83 SBG 13 37 00.91920 -29 51 56.7400 8.85 8.11 7.52 7.21   ~ 2453 2
52 [MJB2015] dw1337-44 LSB 13 37 34.0 -44 13 07           ~ 4 0
53 NGC 5237 IG 13 37 39.056 -42 50 48.90   13.26 12.67 12.34   ~ 102 1
54 [MJB2015] dw1337-41 G? 13 37 55.0 -41 54 11           ~ 2 0
55 NGC 5253 AGN 13 39 55.990 -31 38 24.11 11.48 10.94 10.49 10.33   ~ 1326 4
56 [MJB2015] dw1341-43 LSB 13 41 37.0 -43 51 17           ~ 6 0
57 LEDA 2815823 G 13 41 38.1 -42 34 55   18.1       ~ 26 0
58 LEDA 48515 G 13 42 05.7 -45 12 20   17.6       ~ 46 1
59 [MJB2015] dw1342-43 LSB 13 42 44.0 -43 15 19           ~ 6 0
60 LEDA 166172 G 13 43 36.0 -43 46 11           ~ 30 1
61 ESO 325-11 G 13 45 00.7 -41 51 37   14.02   13.49 12.9 ~ 98 0
62 LEDA 2815824 G 13 46 01.0 -36 19 41   17.1       ~ 21 0
63 LEDA 166175 G 13 46 16.8 -45 41 05   19.2       ~ 35 1
64 ESO 174-1B G 13 47 58.088 -53 20 51.23   14.4   14.2 13.9 ~ 30 1
65 NAME Cen N G 13 48 09.2 -47 33 54           ~ 22 0
66 LEDA 166179 G 13 48 46.4 -46 59 46           ~ 33 1
67 NAME TR 1346-35 GiG 13 49 17.5109711256 -36 03 48.860478360   11.00   10.11   ~ 103 1
68 LEDA 51659 G 14 28 03.7 -46 18 06   15       ~ 70 1
69 NAME Local Void vid 18 38 +18.0           ~ 177 0
70 NAME Local Group GrG ~ ~           ~ 7892 0

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2023.01.27-11:33:41

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