2000AJ....119.2248H

Query : 2000AJ....119.2248H

2000AJ....119.2248H - Astron. J., 119, 2248-2253 (2000/May-0)

The structure of the outer halo of the Galaxy and its relationship to nearby large-scale structure.

HARTWICK F.D.A.

Abstract (from CDS):

We present evidence to support an earlier indication that the Galaxy is embedded in an extended, highly inclined, triaxial halo outlined by the spatial distribution of companion galaxies to the Milky Way. Signatures of this spatial distribution are seen in (1) the angular variation of the radial velocity dispersion of the companion galaxies, (2) the spatial distribution of the M31 subgroup of galaxies, (3) the spatial distribution of the isolated (mainly dwarf irregular) galaxies of the Local Group, (4) the velocity anisotropy quadrupole of a subgroup of high-velocity clouds, and (5) the spatial distribution of galaxies in the Coma-Sculptor cloud. Tidal effects of M31 and surrounding galaxies on the Galaxy are not strong enough to have affected the observed structure. We conclude that this distribution is a reflection of initial conditions. A simple galaxy formation scenario is proposed that relates the results found here to those of Holmberg and Zaritsky et al. regarding the peculiar distribution of satellites around a large sample of spiral galaxies.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: Halo - Galaxy: Structure - Galaxies: Local Group

Simbad objects: 43

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Number of rows : 43
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 NAME Magellanic Stream HVC 00 32 -30.0           ~ 1079 1
4 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
5 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
6 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1498 4
7 IC 1613 GiC 01 04 48.4071 +02 07 10.185   10.42 10.01 9.77   ~ 1316 2
8 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 575 2
9 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
10 NAME E 1 GlC 03 55 02.5 -49 36 52           ~ 229 0
11 NAME Eridanus Star Cluster GlC 04 24 44.5 -21 11 13           ~ 192 1
12 Cl Pal 2 GlC 04 46 05.79720 +31 22 51.0170           ~ 202 0
13 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
14 ESO 206-20A G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1190 0
15 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 998 0
16 NAME Pyxis Cluster GlC 09 07 57.80 -37 13 17.0           ~ 123 0
17 Z 153-10 G 09 59 26.46 +30 44 47.0 14.08 13.54 13.26 13.33   ~ 652 0
18 NGC 3109 AG? 10 03 06.877 -26 09 34.46 11.10 10.42 10.04 9.91   ~ 825 2
19 NAME Sextans C GlC 10 05 30.96 +00 04 15.4   15.5 13.9     ~ 354 1
20 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
21 NAME Sextans dSph LSB 10 13 02.9 -01 36 53   12 10.4     ~ 921 0
22 Z 126-111 G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 899 0
23 GCl 17 GlC 11 29 16.80 +28 58 25.0   14.4       ~ 379 1
24 Z 71-87 H2G 12 58 40.1930636208 +14 13 00.739589628 15.24 15.16 14.98 14.81   ~ 475 0
25 C 1353-269 GlC 13 56 21.702 -27 10 03.00           ~ 146 0
26 NGC 5694 GlC 14 39 36.52 -26 32 18.0           ~ 323 0
27 NGC 5824 GlC 15 03 58.612 -33 04 06.70   10.28 9.56     ~ 441 0
28 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
29 GCl 38 GlC 16 10 59.00 +14 57 42.0           ~ 399 0
30 NGC 6229 GlC 16 46 58.641 +47 31 36.38   9.38 9.86     ~ 397 0
31 GCl 50 GlC 16 59 51.1 -00 32 00   15.70       ~ 224 1
32 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
33 NAME Sgr dIG G 19 29 59.0 -17 40 41   15.5 13.6     ~ 323 1
34 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1661 0
35 MCG-02-53-003 G 20 46 51.7 -12 50 54 15.75 15.18 14.83 14.46   ~ 470 1
36 NGC 7006 GlC 21 01 29.465 +16 11 16.49     10.46     ~ 562 0
37 IC 5152 rG 22 02 41.521 -51 17 47.20   11.03 10.9 10.19   ~ 273 1
38 NAME Tuc Galaxy G 22 41 49.6 -64 25 10   15.7 15.2     ~ 324 0
39 GCl 124 GlC 23 06 44.48 +12 46 19.2   15.6       ~ 307 1
40 MCG-05-55-012 G 23 26 27.52 -32 23 19.5 15.34 14.71 14.23 14.03   ~ 163 0
41 Z 431-72 G 23 28 35.2 +14 44 35 13.85 13.16 12.52     ~ 499 1
42 NAME Local Group GrG ~ ~           ~ 9325 0
43 NAME Com-Scl Cloud Cld ~ ~           ~ 10 0

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