The Effect of Dwarf Galaxies on the Tidal Tails of Globular Clusters

Abstract

The tidal tails of globular clusters have been shown to be sensitive to the external tidal field. We investigate how Galactic globular clusters with observed tails are affected by satellite dwarf galaxies by simulating tails in galaxy models with and without dwarf galaxies. The simulations indicate that tidal tails can be subdivided into into three categories based on how they are affected by dwarf galaxies: 1) dwarf galaxies perturb the progenitor cluster's orbit (NGC 4590, Pal 1, Pal 5), 2) dwarf galaxies perturb the progenitor cluster's orbit and individual tail stars (NGC 362, NGC 1851, NGC 4147, NGC 5466, NGC 7492, Pal 14, Pal 15), and 3) dwarf galaxies negligibly affect tidal tails (NGC 288, NGC 5139, NGC 5904, Eridanus). Perturbations to a cluster's orbit occur when dwarf galaxies pass within its orbit, altering the size and shape of the orbital and tail path. Direct interactions between one or more dwarf galaxies and tail stars lead to kinks and spurs, however we find that features are more difficult to observe in projection. We further find that the tails of Pal 5 are shorter in the galaxy model with dwarf galaxies as it is closer to apocentre, which results in the tails being compressed. Additional simulations reveal that differences between tidal tails in the two galaxy models are primarily due to the Large Magellanic Cloud. Understanding how dwarf galaxies affect tidal tails allows for tails to be used to map the distribution of matter in dwarf galaxies and the Milky Way.

arXiv comment13 pages, 7 figures, excluding 4 appendix figures. Submitted to MNRAS

References in corpus (54)

• galpy: A Python Library for Galactic Dynamics
• Gaia Data Release 2: Kinematics of globular clusters and dwarf galaxies around the Milky Way
• A catalogue of masses, structural parameters and velocity dispersion profiles of 112 Milky Way globular clusters
• The Gravitational Million-Body Problem
• Detection of massive tidal tails around the globular cluster Pal 5 with SDSS commissioning data
• The total mass of the Large Magellanic Cloud from its perturbation on the Orphan stream
• The kinematic status and mass content of the Sculptor dwarf spheroidal galaxy
• Tango for three: Sagittarius, LMC, and the Milky Way
• Proper motions and dynamics of the Milky Way globular cluster system from Gaia DR2
• Stellar Streams Discovered in the Dark Energy Survey
• Star cluster disruption by giant molecular clouds
• Does the Fornax dwarf spheroidal have a central cusp or core?
• Simulations of the Magellanic Stream in a First Infall Scenario
• Uncovering CDM halo substructure with tidal streams
• The Time Scale of Escape from Star Clusters
• Hunting for the Dark Matter Wake Induced by the Large Magellanic Cloud
• The Cold Dark Matter Halos of Local Group Dwarf Spheroidals
• The Orbital Histories of Magellanic Satellites Using Gaia DR2 Proper Motions
• 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 shape of the inner Milky Way halo from observations of the Pal 5 and GD-1 stellar streams
• The Discovery of Tidal Tails Around NGC 5466
• More on the structure of tidal tails
• Modeling the formation and evolution of star cluster populations in galaxy simulations
• Response of the Milky Way's disc to the Large Magellanic Cloud in a first infall scenario
• Linear perturbation theory for tidal streams and the small-scale CDM power spectrum
• Quantifying the impact of the Large Magellanic Cloud on the structure of the Milky Way's dark matter halo using Basis Function Expansions
• Measuring the Mass of the Large Magellanic Cloud with Stellar Streams Observed by $S^5$
• Limit on the LMC mass from a census of its satellites
• Generation of mock tidal streams
• Detection of the Milky Way reflex motion due to the Large Magellanic Cloud infall
• Stellar Streams and Clouds in the Galactic Halo
• Detection of the LMC-induced sloshing of the Galactic halo
• Gaps in globular cluster streams: giant molecular clouds can cause them too
• Search for Extratidal Features Around 17 Globular Clusters in the Sloan Digital Sky Survey
• Discovery of tidal tails around the distant globular cluster Palomar 14
• Effects of baryonic and dark matter substructure on the Pal 5 stream
• Equilibrium models of the Milky Way mass are biased high by the LMC
• Broken into Pieces: ATLAS and Aliqa Uma as One Single Stream
• Modelling the Tucana III stream - a close passage with the LMC
• Tidal tails around the outer halo globular clusters Eridanus and Palomar 15
• Tails and streams around the Galactic globular clusters NGC1851, NGC1904, NGC2298 and NGC2808
• A closer look at the spur, blob, wiggle, and gaps in GD-1
• The Tidal Tails of the Ultra-Faint Globular Cluster Palomar 1
• On the tidal tails of Milky Way globular clusters
• Detection of a 50 degree-long Trailing Tidal Tail for the Globular Cluster M5
• An extended Pal 5 stream in Gaia DR2
• The discovery of tidal tails around the globular cluster NGC 7492 with Pan-STARRS1
• Statistical detection of a tidal stream associated with the globular cluster M68 using Gaia data
• Using Gaia DR2 to detect extratidal structures around the Galactic globular cluster NGC362
• The GALAH Survey: Chemically tagging the Fimbulthul stream to the globular cluster $\omega$ Centauri
• The Effects of Dwarf Galaxies on the Orbital Evolution of Galactic Globular Clusters
• Rediscovering the Tidal Tails of NGC 288 with Gaia DR2
• Variation in the Stellar Mass Function Along Stellar Streams
• The Effects of $\Lambda$CDM Dark Matter Substructure on the Orbital Evolution of Star Clusters

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