2009ApJ...697..269M

Query : 2009ApJ...697..269M

2009ApJ...697..269M - Astrophys. J., 697, 269-274 (2009/May-3)

Did the Milky Way dwarf satellites enter the halo as a group?

METZ M., KROUPA P., THEIS C., HENSLER G. and JERJEN H.

Abstract (from CDS):

The dwarf satellite galaxies in the Local Group are generally considered to be hosted in dark matter subhalos that survived the disruptive processes during infall onto their host halos. It has recently been argued that if the majority of satellites entered the Milky Way (MW) halo in a group rather than individually, this could explain the spatial and dynamical peculiarities of its satellite distribution. Such groups were identified as dwarf galaxy associations that are found in the nearby universe. In this paper, we address the question whether galaxies in such associations can be the progenitors of the MW satellite galaxies. We find that the dwarf associations are much more extended than would be required to explain the disklike distribution of the MW and Andromeda satellite galaxies. We further identify a possible minor filamentary structure, perpendicular to the supergalactic plane, in which the dwarf associations are located, that might be related to the direction of infall of a progenitor galaxy of the MW satellites, if they are of tidal origin.

Abstract Copyright: ∼

Journal keyword(s): galaxies: dwarf - galaxies: evolution - Galaxy: halo - Local Group

Simbad objects: 29

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Number of rows : 29
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 NAME NGC 55 Group GrG 00 32 -29.7           ~ 10 0
2 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
3 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
4 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1498 4
5 NGC 855 GiG 02 14 03.612 +27 52 37.82 14.19 13.56 12.75 12.40   ~ 236 1
6 NAME Sagittarius Stream St* 02 22 +00.0           ~ 1001 0
7 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
8 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
9 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
10 ESO 206-20A G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1190 0
11 NAME NGC 3109 Group GrG 09 59 35.2 -12 49 52           ~ 43 0
12 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
13 NAME Sextans dSph LSB 10 13 02.9 -01 36 53   12 10.4     ~ 921 0
14 NAME M 96 Group GrG 10 46 45 +11 49.1           ~ 330 0
15 Z 126-111 G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 899 0
16 NAME M101 Group GrG 14 03 +54.3           ~ 112 1
17 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
18 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
19 NAME Local Void vid 18 38 +18.0           ~ 234 0
20 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
21 NGC 6949 AGN 20 35 06.9170240784 +64 48 10.045666548   15.0       ~ 65 0
22 IC 5152 rG 22 02 41.521 -51 17 47.20   11.03 10.9 10.19   ~ 273 1
23 NAME ESO 154-23 Group GrG ~ ~           ~ 2 0
24 NAME Local Group GrG ~ ~           ~ 9325 0
25 NAME For-Leo-Scl Stream GrG ~ ~           ~ 12 1
26 NAME UGC 3974 Group GrG ~ ~           ~ 8 0
27 NBGG 14+07 GrG ~ ~           ~ 2 0
28 NAME UGC 8760 Group GrG ~ ~           ~ 7 0
29 NAME NGC 784 Group GrG ~ ~           ~ 17 0

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