2020MNRAS.492..456W

Query : 2020MNRAS.492..456W

2020MNRAS.492..456W - Mon. Not. R. Astron. Soc., 492, 456-467 (2020/February-2)

On the origin of the asymmetric dwarf galaxy distribution around andromeda.

WAN Z., OLIVER W.H., LEWIS G.F., READ J.I. and COLLINS M.L.M.

Abstract (from CDS):

The dwarf galaxy distribution surrounding M31 is significantly anisotropic in nature. Of the 30 dwarf galaxies in this distribution, 15 form a disc-like structure and 23 are contained within the hemisphere facing the Milky Way. Using a realistic local potential, we analyse the conditions required to produce and maintain these asymmetries. We find that some dwarf galaxies are required to have highly eccentric orbits in order to preserve the presence of the hemispherical asymmetry with an appropriately large radial dispersion. Under the assumption that the dwarf galaxies originate from a single association or accretion event, we find that the initial size and specific energy of that association must both be relatively large in order to produce the observed hemispherical asymmetry. However if the association was large in physical size, the very high-energy required would enable several dwarf galaxies to escape from the M31 and be captured by the Milky Way. Furthermore, we find that associations that result in this structure have total specific energies concentrated around E = V_esc2 - V_init2 ∼ 200^2 - 300^2 {km^2 s^{-2}}, implying that the initial velocity and initial position needed to produce the structure are strongly correlated. The overlap of initial conditions required to produce the radial dispersion, angular dispersion, and the planar structure is small and suggests that either they did not originate from a single accretion event, or that these asymmetric structures are short-lived.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: evolution - galaxies: kinematics and dynamics

Simbad objects: 35

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Number of rows : 35
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 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
13 NAME Andromeda I G 00 45 39.8 +38 02 28   13.9 12.7     ~ 355 0
14 NAME Andromeda XI G 00 46 20.0 +33 48 05     17.5     ~ 130 0
15 NAME Andromeda XII G 00 47 27.0 +34 22 29     18.3     ~ 124 0
16 NAME Andromeda XIV G 00 51 35.0 +29 41 49     15.9     ~ 132 0
17 NAME Andromeda XIII G 00 51 51.0 +33 00 16     18.1     ~ 128 0
18 NAME Andromeda IX G 00 52 53.0 +43 11 45     16.3     ~ 176 1
19 NAME Pisces V G 00 59 29.8 +32 22 36     14.4     ~ 149 0
20 NAME Andromeda X G 01 06 33.70 +44 48 15.8     16.6     ~ 125 1
21 NAME Andromeda V G 01 10 17.1 +47 37 41     15.3     ~ 215 0
22 NAME Andromeda XV G 01 14 18.7 +38 07 03     14.6     ~ 123 0
23 NAME Andromeda II G 01 16 29.8 +33 25 09     11.7     ~ 402 0
24 NAME Andromeda XXIV G 01 18 30.0 +46 21 58     16.3     ~ 64 0
25 NAME Andromeda XXII G 01 27 40.0 +28 05 25     18.0     ~ 95 0
26 NAME Andromeda XXIII G 01 29 21.8 +38 43 08     14.2     ~ 88 0
27 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
28 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
29 NGC 3189 GiP 10 18 05.643 +21 49 54.98 12.60 12.12 11.15 11.14   ~ 422 2
30 NAME Andromeda XXVIII G 22 32 41.20 +31 12 58.2     15.6     ~ 88 0
31 NAME Andromeda VII GiG 23 26 31.0 +50 40 33   13.6 11.8     ~ 222 1
32 NAME Peg dSph GiG 23 51 46.3 +24 34 57   14.5 13.2     ~ 250 2
33 NAME Andromeda XXI G 23 54 47.7 +42 28 15     14.8     ~ 117 0
34 NAME Andromeda XXIX G 23 58 55.6 +30 45 20     16.0     ~ 61 0
35 NAME Local Group GrG ~ ~           ~ 9325 0

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