2013MNRAS.435..928B

Query : 2013MNRAS.435..928B

2013MNRAS.435..928B - Mon. Not. R. Astron. Soc., 435, 928-933 (2013/October-3)

Triaxial cosmological haloes and the disc of satellites.

BOWDEN A., EVANS N.W. and BELOKUROV V.

Abstract (from CDS):

We construct simple triaxial generalizations of Navarro-Frenk-White haloes. The models have elementary gravitational potentials, together with a density that is cusped like 1/r at small radii and falls off like 1/r3 at large radii. The ellipticity varies with radius in a manner that can be tailored to the user's specification. The closed periodic orbits in the planes perpendicular to the short and long axes of the model are well described by epicyclic theory, and can be used as building blocks for long-lived discs.

As an application, we carry out the simulations of thin discs of satellites in triaxial dark halo potentials. This is motivated by the recent claims of an extended, thin disc of satellites around the M31 galaxy with a vertical rms scatter of ∼ 12kpc and a radial extent of ∼ 300kpc. We show that a thin satellite disc can persist over cosmological times if and only if it lies in the planes perpendicular to the long or short axis of a triaxial halo, or in the equatorial or polar planes of a spheroidal halo. In any other orientation, then the disc thickness doubles on ∼ 5 Gyr time-scales and so must have been born with an implausibly small vertical scaleheight.


Abstract Copyright: © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)

Journal keyword(s): galaxies: dwarf - galaxies: individual: M31 - galaxies: kinematics and dynamics - Local Group

Simbad objects: 22

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Number of rows : 22
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 XXVI G 00 23 45.6 +47 54 58     17.3     ~ 76 0
2 NAME Andromeda XXV G 00 30 08.9 +46 51 07     14.8     ~ 120 0
3 NGC 147 GiG 00 33 12.120 +48 30 31.46   12.0 9.5     ~ 720 1
4 NAME Andromeda III G 00 35 33.8 +36 29 52     14.4     ~ 309 0
5 NAME Andromeda XXX G 00 36 34.90 +49 38 48.0           ~ 59 0
6 NAME Andromeda XVII G 00 37 07.0 +44 19 20     15.8     ~ 101 0
7 NAME Andromeda XXVII G 00 37 27.1 +45 23 13     16.7     ~ 82 0
8 NGC 185 Sy2 00 38 57.9400026024 +48 20 15.035874648   9.10 9.2     ~ 840 1
9 M 32 GiG 00 42 41.82480 +40 51 54.6120 9.51 9.03 8.08     ~ 2236 2
10 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
11 NAME Andromeda I G 00 45 39.8 +38 02 28   13.9 12.7     ~ 355 0
12 NAME Andromeda XI G 00 46 20.0 +33 48 05     17.5     ~ 130 0
13 NAME Andromeda XII G 00 47 27.0 +34 22 29     18.3     ~ 124 0
14 NAME Andromeda XIV G 00 51 35.0 +29 41 49     15.9     ~ 132 0
15 NAME Andromeda XIII G 00 51 51.0 +33 00 16     18.1     ~ 128 0
16 NAME Andromeda IX G 00 52 53.0 +43 11 45     16.3     ~ 176 1
17 NAME Pisces V G 00 59 29.8 +32 22 36     14.4     ~ 149 0
18 NAME Andromeda V G 01 10 17.1 +47 37 41     15.3     ~ 215 0
19 NAME Andromeda VII GiG 23 26 31.0 +50 40 33   13.6 11.8     ~ 222 1
20 Z 431-72 G 23 28 35.2 +14 44 35 13.85 13.16 12.52     ~ 499 1
21 NAME Peg dSph GiG 23 51 46.3 +24 34 57   14.5 13.2     ~ 250 2
22 NAME Local Group GrG ~ ~           ~ 9325 0

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