2015MNRAS.447.1112B

Query : 2015MNRAS.447.1112B

2015MNRAS.447.1112B - Mon. Not. R. Astron. Soc., 447, 1112-1125 (2015/February-3)

Galactic tides and the shape and orientation of dwarf galaxy satellites.

BARBER C., STARKENBURG E., NAVARRO J.F. and McCONNACHIE A.W.

Abstract (from CDS):

We use cosmological N-body simulations from the Aquarius Project to study the tidal effects of a dark matter halo on the shape and orientation of its substructure. Although tides are often assumed to enhance asphericity and to stretch subhaloes tangentially, these effects are short lived: as in earlier work, we find that subhaloes affected by tides become substantially more spherical and show a strong radial alignment towards the centre of the host halo. These results, combined with a semi-analytic model of galaxy formation, may be used to assess the effect of galactic tides on the observed population of dwarf spheroidal (dSph) satellites of the Milky Way and Andromeda galaxies. If, as the model suggests, the relatively low dark matter content of luminous dSphs such as Fornax and Leo I is due to tidal stripping, then their gravitational potential must be substantially more spherical than that of more heavily dark matter-dominated systems such as Draco or Carina. The model also predicts a tidally-induced statistical excess of satellites whose major axis aligns with the direction to the central galaxy. We find tantalizing evidence of this in the M31 satellite population, which suggests that tides may have played an important role in its evolution.

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

Journal keyword(s): methods: numerical - Galaxy: halo - galaxies: dwarf - galaxies: evolution - galaxies: formation - dark matter

Simbad objects: 42

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Number of rows : 42
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 NAME Andromeda XXVI G 00 23 45.6 +47 54 58     17.3     ~ 76 0
5 NAME Andromeda XXV G 00 30 08.9 +46 51 07     14.8     ~ 120 0
6 NGC 147 GiG 00 33 12.120 +48 30 31.46   12.0 9.5     ~ 720 1
7 NAME Andromeda III G 00 35 33.8 +36 29 52     14.4     ~ 309 0
8 NAME Andromeda XXX G 00 36 34.90 +49 38 48.0           ~ 59 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 M 32 GiG 00 42 41.82480 +40 51 54.6120 9.51 9.03 8.08     ~ 2236 2
14 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
15 NAME Andromeda I G 00 45 39.8 +38 02 28   13.9 12.7     ~ 355 0
16 NAME Andromeda XI G 00 46 20.0 +33 48 05     17.5     ~ 130 0
17 NAME Andromeda XII G 00 47 27.0 +34 22 29     18.3     ~ 124 0
18 NAME Andromeda XIV G 00 51 35.0 +29 41 49     15.9     ~ 132 0
19 NAME Andromeda XIII G 00 51 51.0 +33 00 16     18.1     ~ 128 0
20 NAME Andromeda IX G 00 52 53.0 +43 11 45     16.3     ~ 176 1
21 NAME Pisces V G 00 59 29.8 +32 22 36     14.4     ~ 149 0
22 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1498 4
23 NAME Andromeda X G 01 06 33.70 +44 48 15.8     16.6     ~ 125 1
24 NAME Andromeda V G 01 10 17.1 +47 37 41     15.3     ~ 215 0
25 NAME Andromeda XV G 01 14 18.7 +38 07 03     14.6     ~ 123 0
26 NAME Andromeda II G 01 16 29.8 +33 25 09     11.7     ~ 402 0
27 NAME Andromeda XXIV G 01 18 30.0 +46 21 58     16.3     ~ 64 0
28 NAME Andromeda XXII G 01 27 40.0 +28 05 25     18.0     ~ 95 0
29 NAME Andromeda XXIII G 01 29 21.8 +38 43 08     14.2     ~ 88 0
30 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
31 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
32 ESO 206-20A G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1190 0
33 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
34 NAME Sextans dSph LSB 10 13 02.9 -01 36 53   12 10.4     ~ 921 0
35 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
36 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
37 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
38 NAME Andromeda XXVIII G 22 32 41.20 +31 12 58.2     15.6     ~ 88 0
39 NAME Andromeda VII GiG 23 26 31.0 +50 40 33   13.6 11.8     ~ 222 1
40 NAME Peg dSph GiG 23 51 46.3 +24 34 57   14.5 13.2     ~ 250 2
41 NAME Andromeda XXI G 23 54 47.7 +42 28 15     14.8     ~ 117 0
42 NAME Andromeda XXIX G 23 58 55.6 +30 45 20     16.0     ~ 61 0

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