Planes of satellites around simulated disk galaxies II: Time-persistent planes of kinematically-coherent satellites in $\Lambda$CDM

Abstract

We use two zoom-in $\Lambda$CDM hydrodynamical simulations of massive disk galaxies to study the possible existence of fixed satellite groups showing a kinematically-coherent behaviour across evolution (angular momentum conservation and clustering). We identify three such groups in the two simulations, defining kinematically-coherent, time-persistent planes (KPPs) that last at least from virialization to $z=0$ (more than 7 Gyrs). This proves that orbital pole clustering is not necessarily set in at low redshift, representing a long-lived property of galaxy systems. KPPs are thin and oblate, represent $\sim 25-40\%$ of the total number of satellites in the system, and are roughly perpendicular to their corresponding central disk galaxies during certain periods, consistently with Milky Way $z=0$ data. KPP satellite members are statistically distinguishable from satellites outside KPPs: they show higher specific orbital angular momenta, orbit more perpendicularly to the central disk galaxy, and have larger pericentric distances, than the latter. We numerically prove, for the first time, that KPPs and the best-quality positional planes share the same space configuration across time, such that KPPs act as `skeletons' preventing the latter of being washed out in short timescales. In one of the satellite-host systems, we witness the late capture of a massive dwarf galaxy endowed with its own satellite system, also organized into a KPP configuration prior to its capture. We briefly explore the consequences this event has on the host's KPP, and on the possible enhancement of the asymmetry in the number of satellites rotating in one sense or the opposite within the KPP.

arXiv comment24 pages, 8 figures, 2 tables. Accepted for publication in The Astrophysical Journal

References in corpus (53)

• The Aquarius Project: the subhalos of galactic halos
• GADGET: A code for collisionless and gasdynamical cosmological simulations
• Gaia Data Release 2: Kinematics of globular clusters and dwarf galaxies around the Milky Way
• 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
• The Distribution of Satellite Galaxies: The Great Pancake
• Feedback and metal enrichment in cosmological SPH simulations - II. A multiphase model with supernova energy feedback
• Feedback and metal enrichment in cosmological SPH simulations I. A model for chemical enrichment
• The spatial distribution of the Milky Way and Andromeda satellite galaxies
• Confirmation of Faint Dwarf Galaxies in the M81 Group
• A whirling plane of satellite galaxies around Centaurus A challenges cold dark matter cosmology
• Dwarf Galaxy Planes: the discovery of symmetric structures in the Local Group
• The rotationally stabilized VPOS and predicted proper motions of the Milky Way satellite galaxies
• The orbital poles of Milky Way satellite galaxies: a rotationally supported disc-of-satellites
• The Three-Dimensional Structure of the M31 Satellite System; Strong Evidence for an Inhomogeneous Distribution of 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
• The cosmic web and the orientation of angular momenta
• A thousand shadows of Andromeda: rotating planes of satellites in the Millennium-II cosmological simulation
• Planes of satellite galaxies: when exceptions are the rule
• Chemical evolution of galaxies. I. A composition-dependent SPH model for chemical evolution and cooling
• The universal nature of subhalo accretion
• The Link between Galactic Satellite Orbits and Subhalo Accretion
• The M101 group complex: new dwarf galaxy candidates and spatial structure
• How common is the Milky Way - satellite system alignment?
• Planes of satellites around Milky Way/M31-mass galaxies in the FIRE simulations and comparisons with the Local Group
• The Spatial Distribution of Galactic Satellites in the LCDM Cosmology
• The coherent motion of Cen A dwarf satellite galaxies remains a challenge for $\Lambda$CDM cosmology
• Comparing the observable properties of dwarf galaxies on and off the Andromeda plane
• HST Proper Motions of NGC 147 and NGC 185: Orbital Histories and Test of Dynamically Coherent Andromeda Satellite Plane
• Vast planes of satellites in a high resolution simulation of the Local Group: comparison to Andromeda
• Formation of galaxies in ΛCDM cosmologies. I. The fine structure of disc galaxies
• A comparison of the distribution of satellite galaxies around Andromeda and the results of $\Lambda$CDM simulations
• Testing the two planes of satellites in the Centaurus Group
• Tracing satellite planes in the Sculptor group: I. Discovery of three faint dwarf galaxies around NGC 253
• 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 Role of Baryons in Creating Statistically Significant Planes of Satellites around Milky Way-Mass Galaxies
• Evidence for Early Filamentary Accretion from the Andromeda Galaxy's Thin Plane of Satellites
• The Clustering of Orbital Poles Induced by the LMC: Hints for the Origin of Planes of Satellites
• On the Stability of Satellite Planes I: Effects of Mass, Velocity, Halo Shape and Alignment
• Deviations from tidal torque theory: environment dependences on halo angular momentum growth
• An updated detailed characterization of planes of satellites in the MW and M31
• 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
• We are not the 99 percent: quantifying asphericity in the distribution of Local Group satellites
• Is there a disk of satellites around the Milky Way?
• Is the vast polar structure of dwarf galaxies a serious problem for lambda cold dark matter?

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