2014MNRAS.439...73Y

Query : 2014MNRAS.439...73Y

2014MNRAS.439...73Y - Mon. Not. R. Astron. Soc., 439, 73-82 (2014/March-3)

On the stark difference in satellite distributions around the Milky Way and Andromeda.

YNIGUEZ B., GARRISON-KIMMEL S., BOYLAN-KOLCHIN M. and BULLOCK J.S.

Abstract (from CDS):

We compare spherically averaged radial number counts of bright ( ≳ 105L☉) dwarf satellite galaxies within 400kpc of the Milky Way (MW) and M31 and find that the MW satellites are much more centrally concentrated. Remarkably, the two satellite systems are almost identical within the central 100kpc, while M31 satellites outnumber MW satellites by about a factor of 4 at deprojected distances spanning 100-400kpc. We compare the observed distributions to those predicted for Λ cold dark matter (ΛCDM) subhaloes using a suite of 44 high-resolution ∼ 1012M☉ halo zoom simulations, 22 of which are in pairs like the MW and M31. We find that the radial distribution of satellites around M31 is fairly typical of those predicted for subhaloes, while the MW's distribution is more centrally concentrated than any of our simulated ΛCDM haloes. One possible explanation is that our census of bright ( ≳ 105L☉) MW dwarf galaxies is significantly incomplete beyond ∼ 100kpc of the Sun. If there were ∼ 8-20 more bright dwarfs orbiting undetected at 100-400kpc distance, then the MW's radial distribution would fall within the range expected from subhalo distributions and also look very much like the known M31 system. We use our simulations to demonstrate that there is enough area left unexplored by the Sloan Digital Sky Survey and its extensions that the discovery of ∼ 10 new bright dwarfs is not implausible given the expected range of angular anisotropy of subhaloes in the sky.

Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

Journal keyword(s): Galaxy: halo - galaxies: dwarf - galaxies: individual: M31 - Local Group

Simbad objects: 53

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Number of rows : 53
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 Andromeda XVIII G 00 02 14.5 +45 05 20     16.0     ~ 129 0
2 NAME Andromeda XX G 00 07 30.70 +35 07 56.4     18.2     ~ 77 0
3 And XIX G 00 19 32.10 +35 02 37.1     15.6     ~ 168 0
4 IC 10 rG 00 20 17.33520 +59 18 13.6480   13.6 9.5     ~ 1185 1
5 NAME Andromeda XXVI G 00 23 45.6 +47 54 58     17.3     ~ 76 0
6 NAME Andromeda XXV G 00 30 08.9 +46 51 07     14.8     ~ 120 0
7 NGC 147 GiG 00 33 12.120 +48 30 31.46   12.0 9.5     ~ 720 1
8 NAME Andromeda III G 00 35 33.8 +36 29 52     14.4     ~ 309 0
9 NAME Andromeda XVII G 00 37 07.0 +44 19 20     15.8     ~ 101 0
10 NAME Andromeda XXVII G 00 37 27.1 +45 23 13     16.7     ~ 82 0
11 NGC 185 Sy2 00 38 57.9400026024 +48 20 15.035874648   9.10 9.2     ~ 840 1
12 M 110 GiG 00 40 22.0572349992 +41 41 07.507220136   8.92 8.07     ~ 1370 1
13 NAME Andromeda VIII blu 00 42 06.0 +40 37 00           ~ 27 0
14 M 32 GiG 00 42 41.82480 +40 51 54.6120 9.51 9.03 8.08     ~ 2236 2
15 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
16 NAME Andromeda I G 00 45 39.8 +38 02 28   13.9 12.7     ~ 355 0
17 NAME Andromeda XI G 00 46 20.0 +33 48 05     17.5     ~ 130 0
18 NAME Andromeda XII G 00 47 27.0 +34 22 29     18.3     ~ 124 0
19 NAME Andromeda XIV G 00 51 35.0 +29 41 49     15.9     ~ 132 0
20 NAME Andromeda XIII G 00 51 51.0 +33 00 16     18.1     ~ 128 0
21 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
22 NAME Andromeda IX G 00 52 53.0 +43 11 45     16.3     ~ 176 1
23 NAME Pisces V G 00 59 29.8 +32 22 36     14.4     ~ 149 0
24 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1498 4
25 NAME Pisces I G 01 03 55.0 +21 53 06   16.18 14.3     ~ 404 0
26 NAME Andromeda X G 01 06 33.70 +44 48 15.8     16.6     ~ 125 1
27 NAME Andromeda V G 01 10 17.1 +47 37 41     15.3     ~ 215 0
28 NAME Andromeda XV G 01 14 18.7 +38 07 03     14.6     ~ 123 0
29 NAME Andromeda II G 01 16 29.8 +33 25 09     11.7     ~ 402 0
30 NAME Andromeda XXIV G 01 18 30.0 +46 21 58     16.3     ~ 64 0
31 NAME Andromeda XXII G 01 27 40.0 +28 05 25     18.0     ~ 95 0
32 NAME Andromeda XXIII G 01 29 21.8 +38 43 08     14.2     ~ 88 0
33 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
34 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
35 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
36 ESO 206-20A G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1190 0
37 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
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 Z 126-111 G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 899 0
41 NAME CVn I dwA GiC 12 38 40.06 +32 46 00.5 16.91 16.66 16.73 16.62   ~ 242 0
42 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 491 0
43 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
44 NAME Hercules Dwarf Galaxy G 16 31 02.0 +12 47 30     14.0     ~ 379 1
45 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
46 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
47 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
48 NAME Andromeda XXVIII G 22 32 41.20 +31 12 58.2     15.6     ~ 88 0
49 NAME Andromeda VII GiG 23 26 31.0 +50 40 33   13.6 11.8     ~ 222 1
50 NAME Peg dSph GiG 23 51 46.3 +24 34 57   14.5 13.2     ~ 250 2
51 NAME Andromeda XXI G 23 54 47.7 +42 28 15     14.8     ~ 117 0
52 NAME Andromeda XXIX G 23 58 55.6 +30 45 20     16.0     ~ 61 0
53 NAME Local Group GrG ~ ~           ~ 9325 0

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