Co-orbiting satellite galaxy structures are still in conflict with the distribution of primordial dwarf galaxies

  title={Co-orbiting satellite galaxy structures are still in conflict with the distribution of primordial dwarf galaxies},
  author={Marcel S. Pawlowski and Beno{\^i}t Famaey and Helmut Jerjen and David Merritt and Pavel Kroupa and J{\"o}rg Dabringhausen and Fabian Lughausen and Duncan A. Forbes and Gerhard Hensler and Franccois Hammer and Mathieu Puech and Sylvain Fouquet and H{\'e}ctor Flores and Yanbin Yang},
  journal={Monthly Notices of the Royal Astronomical Society},
Both major galaxies in the Local Group host planar distributions of co-orbiting satellite galaxies, the Vast Polar Structure (VPOS) of the Milky Way and the Great Plane of Andromeda (GPoA). The $\Lambda$CDM cosmological model did not predict these features. However, according to three recent studies the properties of the GPoA and the flattening of the VPOS are common features among sub-halo based $\Lambda$CDM satellite systems, and the GPoA can be naturally explained by satellites being… 

The Planes of Satellite Galaxies Problem, Suggested Solutions, and Open Questions

Satellite galaxies of the Milky Way and of the Andromeda galaxy have been found to preferentially align in significantly flattened planes of satellite galaxies, and available velocity measurements

Evolution of galactic planes of satellites in the eagle simulation

We study the formation of planes of dwarf galaxies around Milky Way (MW)-mass haloes in the eagle galaxy formation simulation. We focus on satellite systems similar to the one in the MW: spatially


The satellite galaxies of the Milky Way (MW) align with and preferentially orbit in a vast polar structure (VPOS), which also contains globular clusters (GCs) and stellar and gaseous streams. Similar

Co-orbiting planes of sub-halos are similarly unlikely around paired and isolated hosts

Sub-halos in dark-matter-based cosmological simulations tend to be distributed approximately isotropically around their host. The existence of highly flattened, co-orbiting planes of satellite

The origin of lopsided satellite galaxy distribution in galaxy pairs

It is well known that satellite galaxies are not isotropically distributed among their host galaxies as suggested by most interpretations of the Λ cold dark matter (ΛCDM) model. One type of

Planes of satellite galaxies: when exceptions are the rule

The detection of planar structures within the satellite systems of both the Milky Way (MW) and Andromeda (M31) has been reported as being in stark contradiction to the predictions of the standard

On the Co-orbitation of Satellite Galaxies along the Great Plane of Andromeda: NGC 147, NGC 185, and Expectations from Cosmological Simulations

Half of the satellite galaxies of Andromeda form a narrow plane termed the Great Plane of Andromeda (GPoA), and their line-of-sight velocities display a correlation reminiscent of a rotating

The Milky Way’s disc of classical satellite galaxies in light of Gaia DR2

We study the correlation of orbital poles of the 11 classical satellite galaxies of the Milky Way, comparing results from previous proper motions with the independent data by Gaia DR2. Previous

New dwarf galaxy candidates in the Centaurus group

Recent studies of the distribution and kinematics of the Milky Way and Andromeda satellite galaxy systems have confirmed the existence of coplanar, corotating structures of galaxies. In addition to

Simulated ΛCDM analogues of the thin plane of satellites around the Andromeda galaxy are not kinematically coherent structures

A large fraction of the dwarf satellites orbiting the Andromeda galaxy are surprisingly aligned in a thin, extended and apparently kinematically coherent planar structure. Such a structure is not



A vast, thin plane of corotating dwarf galaxies orbiting the Andromeda galaxy

Radial velocity measurements reveal that the satellites in this structure have the same sense of rotation about their host, and shows conclusively that substantial numbers of dwarf satellite galaxies share the same dynamical orbital properties and direction of angular momentum.

Dwarf galaxy planes: the discovery of symmetric structures in the Local Group

Both major galaxies in the Local Group (LG) are surrounded by thin planes of mostly co-orbiting satellite galaxies, the vast polar structure (VPOS) around the Milky Way (MW) and the Great Plane of

The co-planarity of satellite galaxies delivered by randomly aligned cold mode accretion streams

Recent observations have shown that the majority of the Andromeda galaxy's satellites are aligned in a thin plane. On the theoretical side it has been proposed that galaxies acquire their gas via


The dwarf satellite galaxies in the Local Group are generally considered to be hosted in dark matter subhalos that survived the disruptive processes during infall onto their host halos. It has

The VPOS: a vast polar structure of satellite galaxies, globular clusters and streams around the Milky Way

It has been known for a long time that the satellite galaxies of the Milky Way (MW) show a significant amount of phase-space correlation, they are distributed in a highly inclined Disc of Satellites

The distribution of satellite galaxies: the great pancake

The 11 known satellite galaxies within 250 kpc of the Milky Way lie close to a great circle on the sky. We use high-resolution N-body simulations of galactic dark matter haloes to test if this

The spatial distribution of the Milky Way and Andromeda satellite galaxies

There are two fundamentally different physical origins of faint satellite galaxies: cosmological sub-structures that contain shining baryons and the fragmentation of gas-rich tidal arms thrown out

The Orbital Poles of Milky Way Satellite Galaxies: A Rotationally Supported Disk of Satellites

We use available proper-motion measurements of Milky Way (MW) satellite galaxies to calculate their orbital poles and projected uncertainties. These are compared with a set of recent cold dark matter

Perseus I and the NGC 3109 association in the context of the Local Group dwarf galaxy structures

The recently discovered dwarf galaxy Perseus I appears to be associated with the dominant plane of non-satellite galaxies in the Local Group (LG). We predict its velocity dispersion and those of the

How common is the Milky Way-satellite system alignment?

The highly flattened distribution of satellite galaxies in the Milky Way (MW) presents a number of puzzles. First, its polar alignment stands out from the planar alignments commonly found in other