2014ApJ...793...63W

Query : 2014ApJ...793...63W

2014ApJ...793...63W - Astrophys. J., 793, 63 (2014/September-3)

The kinematical center and mass profile of the Local Group.

WHITING A.B.

Abstract (from CDS):

Abandoning the assumption that light traces mass, I seek the location of the center of the Local Group of galaxies based solely on kinematic data and the plausible assumption of infall. The available set of positions and radial velocities is shown to be a misleading indicator of Local Group motions, giving a direction to the center offset from the true one; statistical techniques of moderate sophistication do not catch the offset. Corrected calculations show the center to lie in the direction of M31 within the uncertainty of the method, within a few degrees. The distance to the center is not well determined, lying about 0.5 Mpc from the Milky Way. The pattern of observed (galactocentric) radial velocities excludes both dynamically important "orphan halos" and any extended dark matter halo for the Group as a whole, and shows the Group to have formed from a much more extended volume than it presently occupies. Kinematics alone indicates that the mass of the Group is concentrated effectively in M31 and the Milky Way.

Abstract Copyright: ∼

Journal keyword(s): dark matter - galaxies: kinematics and dynamics - Local Group

Simbad objects: 44

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Number of rows : 44
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 IC 10 rG 00 20 17.33520 +59 18 13.6480   13.6 9.5     ~ 1185 1
3 NAME Cetus Dwarf Galaxy G 00 26 10.8 -11 03 14     13.2     ~ 257 0
4 NGC 147 GiG 00 33 12.120 +48 30 31.46   12.0 9.5     ~ 720 1
5 NAME Andromeda III G 00 35 33.8 +36 29 52     14.4     ~ 309 0
6 NGC 185 Sy2 00 38 57.9400026024 +48 20 15.035874648   9.10 9.2     ~ 840 1
7 M 110 GiG 00 40 22.0572349992 +41 41 07.507220136   8.92 8.07     ~ 1370 1
8 M 32 GiG 00 42 41.82480 +40 51 54.6120 9.51 9.03 8.08     ~ 2236 2
9 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
10 NAME Andromeda I G 00 45 39.8 +38 02 28   13.9 12.7     ~ 355 0
11 NAME Andromeda XIV G 00 51 35.0 +29 41 49     15.9     ~ 132 0
12 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
13 NAME Andromeda IX G 00 52 53.0 +43 11 45     16.3     ~ 176 1
14 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1498 4
15 NAME Pisces I G 01 03 55.0 +21 53 06   16.18 14.3     ~ 404 0
16 IC 1613 GiC 01 04 48.4071 +02 07 10.185   10.42 10.01 9.77   ~ 1316 2
17 NAME Andromeda V G 01 10 17.1 +47 37 41     15.3     ~ 215 0
18 NAME Andromeda II G 01 16 29.8 +33 25 09     11.7     ~ 402 0
19 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
20 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 575 2
21 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
22 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
23 ESO 206-20A G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1190 0
24 Z 264-88 AG? 09 16 02.0195908968 +52 50 42.051257412   14.0 13.2     ~ 141 0
25 NAME Leo T G 09 34 53.4 +17 03 05     15.1     ~ 434 0
26 Z 153-10 G 09 59 26.46 +30 44 47.0 14.08 13.54 13.26 13.33   ~ 652 0
27 Z 36-12 H2G 10 00 00.8217342072 +05 20 09.533389560 12.77 12.25 11.89 11.71   ~ 569 0
28 NGC 3109 AG? 10 03 06.877 -26 09 34.46 11.10 10.42 10.04 9.91   ~ 825 2
29 NAME Antlia Dwarf Galaxy G 10 04 03.9 -27 20 01 16.73 15.69 15.17 15.00   ~ 221 1
30 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
31 MCG-01-26-030 H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 789 2
32 NAME Sextans dSph LSB 10 13 02.9 -01 36 53   12 10.4     ~ 921 0
33 Z 126-111 G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 899 0
34 NAME Leo V LSB 11 31 09.60 +02 13 12.0     16.0     ~ 234 0
35 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
36 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
37 NAME Sgr dIG G 19 29 59.0 -17 40 41   15.5 13.6     ~ 323 1
38 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1661 0
39 MCG-02-53-003 G 20 46 51.7 -12 50 54 15.75 15.18 14.83 14.46   ~ 470 1
40 NAME Tuc Galaxy G 22 41 49.6 -64 25 10   15.7 15.2     ~ 324 0
41 NAME Andromeda VII GiG 23 26 31.0 +50 40 33   13.6 11.8     ~ 222 1
42 Z 431-72 G 23 28 35.2 +14 44 35 13.85 13.16 12.52     ~ 499 1
43 NAME Peg dSph GiG 23 51 46.3 +24 34 57   14.5 13.2     ~ 250 2
44 NAME Local Group GrG ~ ~           ~ 9325 0

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