An updated detailed characterization of planes of satellites in the MW and M31

Abstract

We present a detailed characterization of planes of satellite galaxies in the Milky Way (MW) and M31. For a positional analysis, we introduce an extension to the `4-galaxy-normal density plot' method \citep[][P13]{Pawlowski13}. It finds the normal directions to the predominant planar configurations of satellites of a system, yielding for each a \textit{collection} of planes of increasing member satellites. This allows to quantify the quality of planes in terms of population ($N_{\mathrm{sat}}$) and spatial flattening ($c/a$). We apply this method to the latest data for confirmed MW and M31 satellite samples, with 46 and 34 satellites, respectively. New MW satellites form part of planes previously identified from the sample with $N_{\mathrm{sat}}=27$ studied in P13: we identify a new plane with $N_{\mathrm{sat}}=39$ as thin as the VPOS-3 ($c/a\sim 0.2$), and with roughly the same normal direction; so far the most populated plane that thin reported in the Local Group. We introduce a new method to determine, using kinematic data, the axis of maximum co-orbitation of MW satellites. Interestingly, this axis approximately coincides with the normal to the former plane: $\ge 45\pm 5\%$ of satellites co-orbit. In M31 we discover a plane with $N_{\mathrm{sat}}=18$ and $c/a\sim 0.15$, i.e., quality comparable to the GPoA, and perpendicular to it. This structure is viewed face-on from the Sun making it susceptible to M31 satellite distance uncertainties. An estimation of the perpendicular velocity dispersion suggests it is dynamically unstable. Finally we find that mass is not a property determining a satellite's membership to good quality planes.

arXiv comment20 pages. 13 figures. 5 tables. Accepted for publication in MNRAS. Supercedes arXiv:1908.02298. Please cite the NEW version. This updated and extended version of the paper considers up-to-date samples of confirmed MW and M31 satellite galaxies and studies the co-orbitation of MW satellites

References in corpus (66)

• The Sloan Digital Sky Survey: Technical Summary
• The observed properties of dwarf galaxies in and around the Local Group
• Gaia Data Release 2: Kinematics of globular clusters and dwarf galaxies around the Milky Way
• The remnants of galaxy formation from a panoramic survey of the region around M31
• Eight New Milky Way Companions Discovered in First-Year Dark Energy Survey Data
• The Faintest Dwarf Galaxies
• Beasts of the Southern Wild: Discovery of nine Ultra Faint satellites in the vicinity of the Magellanic Clouds
• Eight Ultra-faint Galaxy Candidates Discovered in Year Two of the Dark Energy Survey
• A Vast Thin Plane of Co-rotating Dwarf Galaxies Orbiting the Andromeda Galaxy
• The great disk of Milky-Way satellites and cosmological sub-structures
• The VPOS: a vast polar structure of satellite galaxies, globular clusters and streams around the Milky Way
• Gaia DR2 Proper Motions of Dwarf Galaxies within 420 kpc: Orbits, Milky Way Mass, Tidal Influences, Planar Alignments, and Group Infall
• Four New Stellar Debris Streams in the Galactic Halo
• The Distribution of Satellite Galaxies: The Great Pancake
• The feeble giant. Discovery of a large and diffuse Milky Way dwarf galaxy in the constellation of Crater
• Local-Group tests of dark-matter Concordance Cosmology: Towards a new paradigm for structure formation
• The hidden giant: discovery of an enormous Galactic dwarf satellite in Gaia DR2
• The spatial distribution of the Milky Way and Andromeda satellite galaxies
• A whirling plane of satellite galaxies around Centaurus A challenges cold dark matter cosmology
• A kinematic study of the Andromeda dwarf spheroidal system
• PAndAS' progeny: extending the M31 dwarf galaxy cabal
• Dwarf Galaxy Planes: the discovery of symmetric structures in the Local Group
• A Bayesian Approach to Locating the Red Giant Branch Tip Magnitude (Part II); Distances to the Satellites of M31
• The orbital poles of Milky Way satellite galaxies: a rotationally supported disc-of-satellites
• Scaling Relations and the Fundamental Line of the Local Group Dwarf Galaxies
• The Three-Dimensional Structure of the M31 Satellite System; Strong Evidence for an Inhomogeneous Distribution of Satellites
• Gaia Proper Motions and Orbits of the Ultra-Faint Milky Way Satellites
• Two Planes of Satellites in the Centaurus A Group
• The Anisotropic Distribution of M 31 Satellite Galaxies: A Polar Great Plane of Early-Type Companions
• The satellite distribution of M31
• The Milky Way's Disk of Classical Satellite Galaxies in Light of Gaia DR2
• Discs of Satellites: the new dwarf spheroidals
• Revised and new proper motions for confirmed and candidate Milky Way dwarf galaxies
• Probing the Canis Major stellar over-density as due to the Galactic warp
• Two Ultra-Faint Milky Way Stellar Systems Discovered in Early Data from the DECam Local Volume Exploration Survey
• Lacerta I and Cassiopeia III: Two luminous and distant Andromeda satellite dwarf galaxies found in the 3π Pan-STARRS1 survey
• The new Milky Way satellites: alignment with the VPOS and predictions for proper motions and velocity dispersions
• Proper motions of Milky Way Ultra-Faint satellites with $Gaia$ DR2 $\times$ DES DR1
• A New Milky Way Satellite Discovered In The Subaru/Hyper Suprime-Cam Survey
• The Young Globular Clusters of the Milky Way and the Local Group Galaxies: Playing With Great Circles
• The Formation of the Local Group Planes of Galaxies
• The Closest View of a Dwarf Galaxy: New Evidence on the Nature of the Canis Major over-density
• Comparing the observable properties of dwarf galaxies on and off the Andromeda plane
• Vast planes of satellites in a high resolution simulation of the Local Group: comparison to Andromeda
• Spectroscopy of the three distant Andromedan satellites Cassiopeia III, Lacerta I, and Perseus I
• Testing the two planes of satellites in the Centaurus Group
• Perseus I: A distant satellite dwarf galaxy of Andromeda
• A Gaia DR 2 and VLT/FLAMES search for new satellites of the LMC
• Andromeda XXIX: A New Dwarf Spheroidal Galaxy 200kpc from Andromeda
• Evolution of galactic planes of satellites in the EAGLE simulation
• Simulated ΛCDM analogues of the thin Plane of Satellites around the Andromeda galaxy are not kinematically coherent structures
• The Vast Polar Structure of the Milky Way Attains New Members
• The globular cluster system of the Milky Way: accretion in a cosmological context
• On the distance and reddening of the starburst galaxy IC10
• HST/WFPC2 Imaging of the Dwarf Satellites And XI and And XIII : HB Morphology and RR Lyraes
• No Excess of RR Lyrae Stars in the Canis Major Overdensity
• Co-orbiting planes of sub-halos are similarly unlikely around paired and isolated hosts
• The Milky Way's stellar streams and globular clusters do not align in a Vast Polar Structure
• The ISLAnds Project III: Variable Stars in Six Andromeda Dwarf Spheroidal Galaxies
• RR Lyrae variables in M32 and the disk of M31
• The alignment of SDSS satellites with the VPOS: effects of the survey footprint shape
• Bootes III is a disrupting dwarf galaxy associated with the Styx stellar stream
• On the Stability of Satellite Planes I: Effects of Mass, Velocity, Halo Shape and Alignment
• A rogues gallery of Andromeda's dwarf galaxies II. Precise Distances to 17 Faint Satellites
• ZOMG III: The effect of Halo Assembly on the Satellite Population
• Planes of satellites around simulated disc galaxies: I.- Finding high-quality planar configurations from positional information and their comparison to MW/M31 data

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• From galactic bars to the Hubble tension: weighing up the astrophysical evidence for Milgromian gravity
• The Hubble Space Telescope Survey of M31 Satellite Galaxies I. RR Lyrae-based Distances and Refined 3D Geometric Structure
• The Clustering of Orbital Poles Induced by the LMC: Hints for the Origin of Planes of Satellites
• 3D hydrodynamic simulations for the formation of the Local Group satellite planes
• Barred spiral galaxies in modified gravity theories
• Flattened structures of dwarf satellites around massive host galaxies in the MATLAS low-to-moderate density fields
• The spatial distribution of Milky Way satellites, gaps in streams and the nature of dark matter
• On the absence of backsplash analogues to NGC 3109 in the $\Lambda$CDM framework
• Planes of satellites around simulated disk galaxies II: Time-persistent planes of kinematically-coherent satellites in $\Lambda$CDM
• Analyzing Planar Galactic Halo Distributions with Fuzzy/Cold Dark Matter Models
• The Cen A galaxy group: dynamical mass and missing baryons