Stellar streams as gravitational experiments I. The case of Sagittarius
arXiv:1705.01552 · doi:10.1051/0004-6361/201730531
Abstract
Tidal streams of disrupting dwarf galaxies orbiting around their host galaxy offer a unique way to constrain the shape of galactic gravitational potentials. Such streams can be used as leaning tower gravitational experiments on galactic scales. The most well motivated modification of gravity proposed as an alternative to dark matter on galactic scales is Milgromian dynamics (MOND), and we present here the first ever N-body simulations of the dynamical evolution of the disrupting Sagittarius dwarf galaxy in this framework. Using a realistic baryonic mass model for the Milky Way, we attempt to reproduce the present-day spatial and kinematic structure of the Sagittarius dwarf and its immense tidal stream that wraps around the Milky Way. With very little freedom on the original structure of the progenitor, constrained by the total luminosity of the Sagittarius structure and by the observed stellar mass-size relation for isolated dwarf galaxies, we find reasonable agreement between our simulations and observations of this system. The observed stellar velocities in the leading arm can be reproduced if we include a massive hot gas corona around the Milky Way that is flattened in the direction of the principal plane of its satellites. This is the first time that tidal dissolution in MOND has been tested rigorously at these mass and acceleration scales.
arXiv comment12 pages, 11 figures accepted for publication in A&A. The movie of Fig 6 can be watched at http://astro.unistra.fr/fileadmin/upload/DUN/observatoire/Images/GFThomas_MONDSgrstream_movie.mp4
References in corpus (73)
- Planck 2015 results. XIII. Cosmological parameters
- Cosmological Hydrodynamics with Adaptive Mesh Refinement: a new high resolution code called RAMSES
- Local Kinematics and the Local Standard of Rest
- Too big to fail? The puzzling darkness of massive Milky Way subhaloes
- A 2MASS All-Sky View of the Sagittarius Dwarf Galaxy: I. Morphology of the Sagittarius Core and Tidal Arms
- Modified Newtonian Dynamics (MOND): Observational Phenomenology and Relativistic Extensions
- The Baryonic Tully-Fisher Relation
- SPARC: Mass Models for 175 Disk Galaxies with Spitzer Photometry and Accurate Rotation Curves
- The Sagittarius Dwarf Galaxy: a Model for Evolution in a Triaxial Milky Way Halo
- The unexpected diversity of dwarf galaxy rotation curves
- Great Circle tidal streams: evidence for a nearly spherical massive dark halo around the Milky Way
- The great disk of Milky-Way satellites and cosmological sub-structures
- One Law To Rule Them All: The Radial Acceleration Relation of Galaxies
- Mass models of the Milky Way
- Modified Newtonian Dynamics in the Milky Way
- A 2MASS All-Sky View of the Sagittarius Dwarf Galaxy: IV. Modeling the Sagittarius Tidal Tails
- The Kinematics, Orbit, and Survival of the Sagittarius Dwarf Spheroidal Galaxy
- A huge reservoir of ionized gas around the Milky Way: Accounting for the Missing Mass?
- Quasi-linear formulation of MOND
- Theory of Dark Matter Superfluidity
- A 2MASS All-Sky View of the Sagittarius Dwarf Galaxy: III. Constraints on the Flattening of the Galactic Halo
- Local-Group tests of dark-matter Concordance Cosmology: Towards a new paradigm for structure formation
- Is there a "too big to fail" problem in the field?
- Precession of the Sagittarius stream
- Galaxies as simple dynamical systems: observational data disfavor dark matter and stochastic star formation
- And yet it moves: The dangers of artificially fixing the Milky Way center of mass in the presence of a massive Large Magellanic Cloud
- The Sagittarius Streams in the Southern Galactic Hemisphere
- A Two Micron All-Sky Survey View of the Sagittarius Dwarf Galaxy: II. Swope Telescope Spectroscopy of M Giant Stars in the Dynamically Cold Sagittarius Tidal Stream
- Ram Pressure Stripping of the Large Magellanic Cloud's Disk as a Probe of the Milky Way's Circumgalactic Medium
- Constraints on the shape of the Milky Way dark matter halo from the Sagittarius stream
- Tidal Tails Test the Equivalence Principle in the Dark Sector
- Re-Assembling the Sagittarius Dwarf Galaxy
- Local Group Dwarf Spheroidals: Correlated Deviations from the Baryonic Tully-Fisher Relation
- Unveiling the corona of the Milky Way via ram-pressure stripping of dwarf satellites
- Was the Progenitor of the Sagittarius Stream a Disc Galaxy?
- Refining MOND interpolating function and TeVeS Lagrangian
- Crater 2: An Extremely Cold Dark Matter Halo
- The vast thin plane of M31 co-rotating dwarfs: an additional fossil signature of the M31 merger and of its considerable impact in the whole Local Group
- The origin of the Milky Way globular clusters
- Is the dark halo of our Galaxy spherical?
- The Relation between Stellar and Dynamical Surface Densities in the Central Regions of Disk Galaxies
- Evolution of spiral galaxies in modified gravity
- On the Hot Gas Content of the Milky Way Halo
- Galilean Equivalence for Galactic Dark Matter
- A statistical investigation of the mass discrepancy-acceleration relation
- Tracing the Outer Structure of the Sagittarius Dwarf Galaxy: Detections at Angular Distances Between 10 and 34 Degrees
- Combined Solar System and rotation curve constraints on MOND
- Stellar Streams as Probes of Dark Halo Mass and Morphology: A Bayesian Reconstruction
- Stability of disk galaxies in the modified dynamics
- Making Counter-Orbiting Tidal Debris: The Origin of the Milky Way Disc of Satellites
- Tidal Stream Morphology as an Indicator of Dark Matter Halo Geometry: the Case of Palomar 5
- On the persistence of two small-scale problems in ΛCDM
- Galactic rotation curves, the baryon-to-dark-halo-mass relation and space-time scale invariance
- What's Up in the Milky Way? The Orientation of the Disc Relative to the Triaxial Halo
- Dynamical friction in modified Newtonian dynamics
- Predicted Extension of the Sagittarius Stream to the Milky Way Virial Radius
- An assessment of the "too big to fail" problem for field dwarf galaxies in view of baryonic feedback effects
- Universal MOND relation between the baryonic and `dynamical' central surface densities of disc galaxies
- Dwarf elliptical galaxies as ancient tidal dwarf galaxies
- Modeling Tidal Streams in evolving dark matter halos
- Two-body relaxation in modified Newtonian dynamics
- Star formation triggered by galaxy interactions in modified gravity
- A scaling-relation for disc galaxies: circular-velocity gradient versus central surface brightness
- Dark Matter via Massive (bi-)Gravity
- Dissipationless collapses in MOND
- RAyMOND: An N-body and hydrodynamics code for MOND
- MOND Prediction for the Velocity Dispersion of the `Feeble Giant' Crater II
- Evolution of spiral galaxies in modified gravity: II- Gas dynamics
- Tidal streams in a MOND potential: constraints from Sagittarius
- Polytropic model fits to the globular cluster NGC 2419 in Modified Newtonian Dynamics
- Exploring the reality of density substructures in the Palomar 5 stellar stream
- N-body simulations of the Carina dSph in MOND
- Lopsidedness of cluster galaxies in modified gravity
Cited by in corpus (40)
- Tango for three: Sagittarius, LMC, and the Milky Way
- From galactic bars to the Hubble tension: weighing up the astrophysical evidence for Milgromian gravity
- The last breath of the Sagittarius dSph
- Fourteen candidate RR Lyrae star streams in the inner Galaxy
- Census and classification of low-surface-brightness structures in nearby early-type galaxies from the MATLAS survey
- MOND simulation suggests the origin of some peculiarities in the Local Group
- Systematic search for tidal features around nearby galaxies: I. Enhanced SDSS imaging of the Local Volume
- Star Clusters in Evolving Galaxies
- The distribution and morphologies of Fornax Cluster dwarf galaxies suggest they lack dark matter
- A panoramic landscape of the Sagittarius stream in Gaia DR2 revealed with the STREAMFINDER spyglass
- Stellar streams as gravitational experiments II. Asymmetric tails of globular cluster streams
- A-type stars in the Canada-France Imaging Survey I. The stellar halo of the Milky Way traced to large radius by blue horizontal branch stars
- Origin of the Local Group satellite planes
- Noncovariance at low accelerations as a route to MOND
- 3D hydrodynamic simulations for the formation of the Local Group satellite planes
- The global stability of M33 in MOND
- The hidden past of M92: Detection and characterization of a newly formed 17° long stellar stream using the Canada-France Imaging Survey
- The Escape Velocity Curve of the Milky Way in Modified Newtonian Dynamics
- Barred spiral galaxies in modified gravity theories
- The Pristine survey -- VII. A cleaner view of the Galactic outer halo using blue horizontal branch stars
- The formation of early-type galaxies through monolithic collapse of gas clouds in Milgromian gravity
- The Phantom of RAMSES user guide for galaxy simulations using Milgromian and Newtonian gravity
- The phantom dark matter halos of the Local Volume in the context of modified Newtonian dynamics
- Simulations of star forming main sequence galaxies in Milgromian gravity
- Uncovering fossils of the distant Milky Way with UNIONS: NGC 5466 and its stellar stream
- 1-DREAM: 1D Recovery, Extraction and Analysis of Manifolds in noisy environments
- Consequences of the external field effect for MOND disk galaxies in galaxy clusters
- Low Surface Brightness structures from annotated deep CFHT images: effects of the host galaxy's properties and environment
- A Pristine-UNIONS view on the Galaxy: Kinematics of the distant spur feature of the Sagittarius stream traced by Blue Horizontal Branch stars
- Modelling the Track of the GD-1 Stellar Stream Inside a Host with a Fermionic Dark Matter Core-Halo Distribution
- Probing modified Newtonian dynamics with hypervelocity stars
- Broader view of bimetric MOND
- Dipolar dark matter simulations on galaxy scales with the RAMSES code
- Simulations of cluster ultra-diffuse galaxies in MOND
- Globular cluster orbital decay in dwarf galaxies with MOND and CDM: Impact of supernova feedback
- Exploring the Sagittarius stream with RR Lyrae Stars from Gaia Data Release 3
- Measuring Mass of Gas in Central Galaxies using weak lensing and satellite kinematics in MOND
- Scaling relations of early-type galaxies in MOND
- Testing MOND using the dynamics of nearby stellar streams
- Investigating the origin of the Milky Way streams. A revised look at their orbital pole distribution in light of precession effects