Query : 2017A&A...600A..17P

2017A&A...600A..17P - Astronomy and Astrophysics, volume 600A, 17-17 (2017/4-1)

Off-center dark matter halo leading to strong central disk lopsidedness.


Abstract (from CDS):

There is increasing evidence from simulations and observations that the center of the dark matter halo in a Milky Way-type galaxy could be off-center by a few 100pc with respect to the galactic disk. We study the effect of such an offset halo on the orbits and kinematics in the central few kpc of the disk via a simple, analytical model. The equations of motion in the disk plane can be written in terms of the potentials of the disk and halo when they are concentric, and a perturbation term arising due to the offset halo. We show that this perturbation potential has an m=1 azimuthal variation, or is lopsided, and its magnitude increases at small radii. On solving these equations, we find that the perturbed orbit shows a large deviation, ∼40% in radius at R=1.5kpc, and also strong kinematical lopsidedness. Thus, even a small halo offset of 350pc can induce surprisingly strong spatial and kinematical lopsidedness in the central region within a ∼3kpc radius. The disk lopsidedness would have important implications for the evolution of this region; for example, it could help fuel the central active galactic nucleus.

Abstract Copyright: © ESO, 2017

Journal keyword(s): galaxies: halos - galaxies: kinematics and dynamics - galaxies: spiral - galaxies: structure - Galaxy: center - Galaxy: center

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 M 99 H2G 12 18 49.625 +14 24 59.36 10.45 10.44 9.87     ~ 856 2
2 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 4002 3
3 ACO 3827 ClG 22 01 49.1 -59 57 15           ~ 146 0

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