On the Origin of Dynamically Cold Rings Around the Milky Way

Abstract

We present a scenario for the production of dynamically cold rings around the Milky Way via a high-eccentricity, flyby encounter. These initial conditions are more cosmologically motivated than those considered in previous works. We find that the encounters we examine generically produce a series of nearly dynamically cold ring-like features on low-eccentricity orbits that persist over timescales of ~2-4 Gyr via the tidal response of the primary galaxy to the close passage of the satellite. Moreover, they are both qualitatively and quantitatively similar to the distribution, kinematics, and stellar population of the Monoceros ring. Therefore, we find that a high eccentricity flyby by a satellite galaxy represents a cosmologically appealing scenario for forming kinematically distinct ring-like features around the Milky Way.

arXiv commentaccepted to ApJL; 4 Figures

References in corpus (47)

• The Sloan Digital Sky Survey: Technical Summary
• The cosmological simulation code GADGET-2
• The Global Schmidt Law in Star Forming Galaxies
• Dark Matter Substructure in Galactic Halos
• Profiles of dark haloes: evolution, scatter, and environment
• Cosmological SPH simulations: A hybrid multi-phase model for star formation
• Modeling feedback from stars and black holes in galaxy mergers
• Gasdynamics and Starbursts in Major Mergers
• Tracing Galaxy Formation with Stellar Halos I: Methods
• The Field of Streams: Sagittarius and its Siblings
• Cosmological SPH simulations: The entropy equation
• Black holes in galaxy mergers: The formation of red elliptical galaxies
• The Ghost of Sagittarius and Lumps in the Halo of the Milky Way
• The tumultuous lives of galactic dwarfs and the missing satellites problem
• Are the Magellanic Clouds on their First Passage about the Milky Way?
• Quantifying the Fragility of Galactic Disks in Minor Mergers
• Dynamical Friction and Galaxy Merging Timescales
• A Low Latitude Halo Stream around the Milky Way
• How to Plant a Merger Tree
• The structure of galactic disks: Studying late-type spiral galaxies using SDSS
• A dwarf galaxy remnant in Canis Major: the fossil of an in-plane accretion onto the Milky Way
• Excitation of Activity in Galaxies by Minor Mergers
• The Photo-Evaporation of Dwarf Galaxies During Reionization
• One Ring to Encompass them All: A giant stellar structure that surrounds the Galaxy
• Orbital Parameters of Merging Dark Matter Halos
• On the accretion origin of a vast extended stellar disk around the Andromeda galaxy
• Anti-Truncation of Disks in Early-Type Barred Galaxies
• A comprehensive model for the Monoceros tidal stream
• Shock-induced star formation in a model of the Mice
• Exploring Halo Substructure with Giant Stars: Spectroscopy of Stars in the Galactic Anticenter Stellar Structure
• Accretion relicts in the solar neighbourhood: debris from omegaCen's parent galaxy
• Substructure in Tidal Streams; Tributaries in the Anticenter Ring
• Exploring Halo Substructure with Giant Stars X. Extended Dark Matter or Tidal Disruption?: The Case for the Leo I Dwarf Spheroidal Galaxy
• Antitruncated Stellar Disks via Minor Mergers
• Elemental Abundance Ratios in Stars of the Outer Galactic Disk. III. Cepheids
• On the formation of extended galactic disks by tidally disrupted dwarf galaxies
• Evaluating Semi-Analytic Halo Merging Histories
• On the nature of the ring-like structure in the outer Galactic disk
• Star Clusters in the Galactic Anticenter Stellar Structure and the Origin of Outer Old Open Clusters
• The distance to the Leo I dwarf spheroidal galaxy from the Red Giant Branch Tip
• The AAT/WFI survey of the Monoceros Ring and Canis Major Dwarf galaxy: I. from l = (193 - 276)o
• An SDSS Survey For Resolved Milky Way Satellite Galaxies I: Detection Limits
• A radial velocity survey of low Galactic latitude structures: I. Kinematics of the Canis Major dwarf galaxy
• The INT/WFC survey of the Monoceros Ring: Accretion origin or Galactic Anomaly?
• Stellar populations in the dwarf spheroidal galaxy Leo I
• The Effect of Thermal Conduction on the Virgo Cluster
• The Ultra Luminous X-ray sources in the High Velocity System of NGC 1275

Cited by in corpus (47)

• Thin, thick and dark discs in LCDM
• Rings and Radial Waves in the Disk of the Milky Way
• Vertical density waves in the Milky Way disc induced by the Sagittarius Dwarf Galaxy
• The Influence of Sagittarius and the Large Magellanic Cloud on the Milky Way Galaxy
• Mapping the stellar structure of the Milky Way thick disk and halo using SEGUE photometry
• Color Profiles of Spiral Galaxies: Clues on Outer-Disk Formation Scenarios
• Toward first-principle simulations of galaxy formation: I. How should we choose star formation criteria in high-resolution simulations of disk galaxies?
• Radial mixing in the outer Milky Way disk caused by an orbiting satellite
• Discovery of a Giant Stellar Tidal Stream Around the Disk Galaxy NGC 4013
• Warps and waves in the stellar discs of the Auriga cosmological simulations
• Excitation of coupled stellar motions in the Galactic Disk by orbiting satellites
• Signatures of minor mergers in the Milky Way disc I: The SEGUE stellar sample
• The Complex Structure of Stars in the Outer Galactic Disk as revealed by Pan-STARRS1
• Exploring Halo Substructure with Giant Stars: The Nature of the Triangulum-Andromeda Stellar Features
• The phase spiral in Gaia DR3
• On Rings and Streams in the Galactic Anti-Center
• Mapping the Monoceros Ring in 3D with Pan-STARRS1
• Metallicities and Radial Velocities of Five Open Clusters Including a New Candidate Member of the Monoceros Stream
• A Disk Origin for the Monoceros Ring and A13 Stellar Overdensities
• The fall of the Northern Unicorn: Tangential motions in the Galactic Anti-centre with SDSS and Gaia
• Phase Wrapping of Epicyclic Perturbations in the Wobbly Galaxy
• Spontaneous generation of bending waves in isolated Milky Way-like discs
• The Chemical Evolution of the Monoceros Ring/Galactic Anticenter Stellar Structure
• Tidally induced spiral arm wraps encoded in phase space
• Migration and Mixing in the Galactic Disc from Encounters between Sagittarius and the Milky Way
• Galactic seismology: joint evolution of impact-triggered stellar and gaseous disc corrugations
• The slowing down of galaxy disks in dissipationless minor mergers
• R-process-rich stellar streams in the Milky Way
• Measuring the vertical response of the Galactic disc to an infalling satellite
• Unveiling the nature of M94's (NGC4736) outer region: a panchromatic perspective
• Slicing The Monoceros Overdensity with Suprime-Cam
• Living with Neighbors. II. Statistical Analysis of Flybys and Mergers of Dark Matter Halos in Cosmological Simulations
• The Metallicity of the Monoceros Stream
• First Chemical Analysis of Stars in The Triangulum-Andromeda Star Cloud
• The outer disc in shambles: blind detection of Monoceros and ACS with Gaia's astrometric sample
• Spectroscopic hint of a cold stream in the direction of the globular cluster NGC 1851
• Radial Velocity and Metallicity of the Globular Cluster IC4499 Obtained with AAOmega
• Kinematics in Kapteyn's Selected Area 76: Orbital Motions Within the Highly Substructured Anticenter Stream
• A Map of the Local Velocity Substructure in the Milky Way Disk
• A Sagittarius-Induced Origin for the Monoceros Ring
• Photometric scaling relations of antitruncated stellar discs in S0-Scd galaxies
• On the Origin of the Monoceros Ring - I: Kinematics, proper motions, and the nature of the progenitor
• A Megacam Survey of Outer Halo Satellites. IV. Two foreground populations possibly associated with the Monoceros substructure in the direction of NGC2419 and Koposov2
• Ha Velocity Fields and Galaxy Interaction in the Quartet of Galaxies NGC 7769, 7770, 7771 and 7771A
• The role of impact parameter in typical close galaxy flybys
• Introduction to Tidal Streams
• Mapping low-latitude stellar substructure with SEGUE photometry