2008MNRAS.389.1001L

Query : 2008MNRAS.389.1001L

2008MNRAS.389.1001L - Mon. Not. R. Astron. Soc., 389, 1001-1007 (2008/September-2)

The three-dimensional structural shape of the gravitational potential in the Local Group.

LEE B. and LEE J.

Abstract (from CDS):

The Local Group is a small galaxy cluster with a membership of 62 nearby galaxies including the Milky Way and M31. Although the Local Group has yet to be virialized, it interacts with the surrounding matter as one gravitationally bound system. To understand the formation and evolution of the Local Group as well as its member galaxies, it is important to reconstruct the gravitational potential field from the surrounding matter distribution in the local cosmic web. By measuring the anisotropy in the spatial distribution of the Local Group galaxies, which is assumed to be induced by the local gravitational tidal field, we resolve the three-dimensional structure of the gravitational potential in the vicinity of the Milky Way smoothed on the Local Group mass scale. Our results show that (i) the minor principal axis of the Local Group tidal field is in the equatorial direction of αp= 15h00m and δp= 20°; (ii) it has a prolate shape with axial ratio of 0.5±0.13; (iii) the global tides in the Local Group are quite strong, which may provide a partial explanation for the low abundance of dwarf galaxies in the Local Group.

Abstract Copyright: © 2008 The Authors. Journal compilation © 2008 RAS

Journal keyword(s): methods: statistical - galaxies: haloes - Local Group - cosmology: theory - large-scale structure of Universe

Simbad objects: 63

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Number of rows : 63
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 MCG-03-01-015 G 00 01 57.9 -15 27 50   11.50 11.10 10.93   ~ 782 2
2 NGC 55 rG 00 14 53.602 -39 11 47.86 8.54 8.58 7.87 7.84   ~ 828 2
3 IC 10 rG 00 20 17.33520 +59 18 13.6480   13.6 9.5     ~ 1185 1
4 NAME Cetus Dwarf Galaxy G 00 26 10.8 -11 03 14     13.2     ~ 257 0
5 NGC 147 GiG 00 33 12.120 +48 30 31.46   12.0 9.5     ~ 720 1
6 NAME Andromeda III G 00 35 33.8 +36 29 52     14.4     ~ 309 0
7 NAME Andromeda XVII G 00 37 07.0 +44 19 20     15.8     ~ 101 0
8 NGC 185 Sy2 00 38 57.9400026024 +48 20 15.035874648   9.10 9.2     ~ 840 1
9 M 110 GiG 00 40 22.0572349992 +41 41 07.507220136   8.92 8.07     ~ 1370 1
10 M 32 GiG 00 42 41.82480 +40 51 54.6120 9.51 9.03 8.08     ~ 2236 2
11 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
12 NAME Andromeda I G 00 45 39.8 +38 02 28   13.9 12.7     ~ 355 0
13 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
14 NAME Andromeda IX G 00 52 53.0 +43 11 45     16.3     ~ 176 1
15 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1498 4
16 NAME Pisces I G 01 03 55.0 +21 53 06   16.18 14.3     ~ 404 0
17 IC 1613 GiC 01 04 48.4071 +02 07 10.185   10.42 10.01 9.77   ~ 1316 2
18 NAME Andromeda X G 01 06 33.70 +44 48 15.8     16.6     ~ 125 1
19 NAME Andromeda V G 01 10 17.1 +47 37 41     15.3     ~ 215 0
20 NAME Andromeda II G 01 16 29.8 +33 25 09     11.7     ~ 402 0
21 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
22 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 575 2
23 NAME Cas 1 G 02 06 07.9 +69 00 36     14.62     ~ 53 0
24 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
25 UGCA 92 AG? 04 32 03.8366 +63 36 51.243   16.15       ~ 128 0
26 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
27 ESO 206-20A G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1190 0
28 NAME CMa Dwarf Galaxy G 07 12.6 -27 40     -0.1     ~ 203 1
29 NAME UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 410 0
30 NAME Leo T G 09 34 53.4 +17 03 05     15.1     ~ 434 0
31 Z 153-10 G 09 59 26.46 +30 44 47.0 14.08 13.54 13.26 13.33   ~ 652 0
32 Z 36-12 H2G 10 00 00.8217342072 +05 20 09.533389560 12.77 12.25 11.89 11.71   ~ 569 0
33 NGC 3109 AG? 10 03 06.877 -26 09 34.46 11.10 10.42 10.04 9.91   ~ 825 2
34 NAME Antlia Dwarf Galaxy G 10 04 03.9 -27 20 01 16.73 15.69 15.17 15.00   ~ 221 1
35 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 517 1
36 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
37 MCG-01-26-030 H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 789 2
38 NAME Sextans dSph LSB 10 13 02.9 -01 36 53   12 10.4     ~ 921 0
39 NAME UMa I Galaxy G 10 34 52.80 +51 55 12.0     14.4     ~ 355 1
40 NAME Willman 1 G 10 49 21.0 +51 03 00     15.2     ~ 345 0
41 Z 126-111 G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 899 0
42 NAME Leo IV LSB 11 32 57.0 -00 32 00     15.1     ~ 419 1
43 NAME Coma Dwarf Galaxy G 12 26 59.0 +23 54 15     14.1     ~ 482 1
44 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
45 NAME CVn II dSph G 12 57 09.6 +34 19 12     16.1     ~ 287 2
46 Z 71-87 H2G 12 58 40.1930636208 +14 13 00.739589628 15.24 15.16 14.98 14.81   ~ 475 0
47 NAME CVn I dSph G 13 28 03.5 +33 33 21     13.1     ~ 352 1
48 NAME Bootes II G 13 58 00.0 +12 51 00     15.4     ~ 269 0
49 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 491 0
50 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
51 NAME Hercules Dwarf Galaxy G 16 31 02.0 +12 47 30     14.0     ~ 379 1
52 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
53 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
54 NAME Sgr dIG G 19 29 59.0 -17 40 41   15.5 13.6     ~ 323 1
55 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1661 0
56 MCG-02-53-003 G 20 46 51.7 -12 50 54 15.75 15.18 14.83 14.46   ~ 470 1
57 IC 5152 rG 22 02 41.521 -51 17 47.20   11.03 10.9 10.19   ~ 273 1
58 NAME Tuc Galaxy G 22 41 49.6 -64 25 10   15.7 15.2     ~ 324 0
59 MCG-05-55-012 G 23 26 27.52 -32 23 19.5 15.34 14.71 14.23 14.03   ~ 163 0
60 NAME Andromeda VII GiG 23 26 31.0 +50 40 33   13.6 11.8     ~ 222 1
61 Z 431-72 G 23 28 35.2 +14 44 35 13.85 13.16 12.52     ~ 499 1
62 NAME Peg dSph GiG 23 51 46.3 +24 34 57   14.5 13.2     ~ 250 2
63 NAME Local Group GrG ~ ~           ~ 9325 0

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