1999AJ....118..337C

Query : 1999AJ....118..337C

1999AJ....118..337C - Astron. J., 118, 337-345 (1999/July-0)

The solar motion relative to the Local Group.

COURTEAU S. and VAN DEN BERGH S.

Abstract (from CDS):

New data on the membership of the Local Group (LG) are used, in conjunction with new and improved radial velocity data, to refine the derivation of the motion of the Sun relative to the LG. The Sun is found to be moving with a velocity of V=306±18 km.s–1 toward an apex at l=99°±5° and b=-4°±4°. This finding agrees very well with previous analyses, but we discuss the possibility of a bias if the phase-space distribution of LG galaxies is bimodal. The LG radial velocity dispersion is 61±8 km.s–1. We use various mass estimators to compute the mass of the LG and the Andromeda subgroup. We find MLG=(2.3±0.6)x1012 M☉, from which M/LV=44±12 (in solar units). For an assumed LG age of 14±2 Gyr, the radius of an idealized LG zero-velocity surface is r0=1.18±0.15 Mpc. The LG is found to have 35 likely members. Only three of these have (uncertain) distances ≳1.0 Mpc from the LG barycenter. Barring new discoveries of low surface brightness dwarfs, this suggests that the LG is more compact and more isolated from its surroundings than previously believed.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Clusters: General - Galaxies: Kinematics and Dynamics - Galaxies: Spiral - Galaxies: Local Group

Simbad objects: 55

goto Full paper

goto View the references in ADS

Number of rows : 55
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 LEDA 1792 G 00 29 16.3 +33 20 47   19       ~ 5 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 NGC 185 Sy2 00 38 57.9400026024 +48 20 15.035874648   9.10 9.2     ~ 840 1
8 M 110 GiG 00 40 22.0572349992 +41 41 07.507220136   8.92 8.07     ~ 1370 1
9 M 32 GiG 00 42 41.82480 +40 51 54.6120 9.51 9.03 8.08     ~ 2236 2
10 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
11 NAME Andromeda I G 00 45 39.8 +38 02 28   13.9 12.7     ~ 355 0
12 NGC 247 LSB 00 47 08.554 -20 45 37.44 10.11 9.61 9.10 8.87   ~ 480 2
13 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
14 NGC 300 GiG 00 54 53.4465638304 -37 41 03.168402396 8.83 8.69 8.13 7.46   ~ 1614 2
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 V G 01 10 17.1 +47 37 41     15.3     ~ 215 0
19 NAME Andromeda II G 01 16 29.8 +33 25 09     11.7     ~ 402 0
20 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
21 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 575 2
22 NAME Cas 1 G 02 06 07.9 +69 00 36     14.62     ~ 53 0
23 UGCA 34 GiG 02 36 35.4662282832 +59 39 17.507008584   17       ~ 198 2
24 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
25 NAME IC 342 Group GrG 03 48 42 +68 00.8           ~ 102 1
26 UGCA 86 AG? 03 59 48.30 +67 08 18.6   14.2 14.2     ~ 110 0
27 NGC 1560 GiG 04 32 49.087 +71 52 59.20   12.1       ~ 264 0
28 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
29 ESO 206-20A G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1190 0
30 Z 153-10 G 09 59 26.46 +30 44 47.0 14.08 13.54 13.26 13.33   ~ 652 0
31 Z 36-12 H2G 10 00 00.8217342072 +05 20 09.533389560 12.77 12.25 11.89 11.71   ~ 569 0
32 NGC 3109 AG? 10 03 06.877 -26 09 34.46 11.10 10.42 10.04 9.91   ~ 825 2
33 NAME Antlia Dwarf Galaxy G 10 04 03.9 -27 20 01 16.73 15.69 15.17 15.00   ~ 221 1
34 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
35 MCG-01-26-030 H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 789 2
36 NAME Sextans dSph LSB 10 13 02.9 -01 36 53   12 10.4     ~ 921 0
37 Z 126-111 G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 899 0
38 Z 71-87 H2G 12 58 40.1930636208 +14 13 00.739589628 15.24 15.16 14.98 14.81   ~ 475 0
39 NGC 5237 EmG 13 37 39.056 -42 50 48.90   13.26 12.67 12.34   ~ 116 1
40 Z 133-19 AG? 14 15 57.0834 +23 03 29.871 15.40 14.77 14.41 14.32   ~ 296 0
41 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
42 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
43 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
44 NAME Sgr dIG G 19 29 59.0 -17 40 41   15.5 13.6     ~ 323 1
45 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1661 0
46 MCG-02-53-003 G 20 46 51.7 -12 50 54 15.75 15.18 14.83 14.46   ~ 470 1
47 IC 5152 rG 22 02 41.521 -51 17 47.20   11.03 10.9 10.19   ~ 273 1
48 NAME Tuc Galaxy G 22 41 49.6 -64 25 10   15.7 15.2     ~ 324 0
49 NAME Pisces II G 22 58 31.0 +05 57 09     16.3     ~ 283 0
50 MCG-05-55-012 G 23 26 27.52 -32 23 19.5 15.34 14.71 14.23 14.03   ~ 163 0
51 NAME Andromeda VII GiG 23 26 31.0 +50 40 33   13.6 11.8     ~ 222 1
52 Z 431-72 G 23 28 35.2 +14 44 35 13.85 13.16 12.52     ~ 499 1
53 NAME Peg dSph GiG 23 51 46.3 +24 34 57   14.5 13.2     ~ 250 2
54 NGC 7793 GiG 23 57 49.7540045856 -32 35 27.701550744 10.26 9.74 9.28 9.06 9.7 ~ 1188 2
55 NAME Local Group GrG ~ ~           ~ 9325 0

To bookmark this query, right click on this link: simbad:objects in 1999AJ....118..337C and select 'bookmark this link' or equivalent in the popup menu