Harassment Origin for Kinematic Substructures in Dwarf Elliptical Galaxies?

Abstract

We have run high resolution N-body models simulating the encounter of a dwarf galaxy with a bright elliptical galaxy. The dwarf absorbs orbital angular momentum and shows counter-rotating features in the external regions of the galaxy. To explain the core-envelope kinematic decoupling observed in some dwarf galaxies in high-density environments requires nearly head-on collisions and very little dark matter bound to the dwarf. These kinematic structures appear under rather restrictive conditions. As a consequence, in a cluster like Virgo ~1% of dwarf galaxies may present counter-rotation formed by harassment.

10 pages, 7 figures; Accepted for publication in Astronomy and Astrophysics

References in corpus (17)

• Dwarf Galaxies of the Local Group
• The Formation of Galactic Disks
• Galaxy Harassment and the Evolution of Clusters of Galaxies
• GADGET: A code for collisionless and gasdynamical cosmological simulations
• The Central Mass Distribution in Dwarf and Low Surface Brightness Galaxies
• Dwarf Elliptical Galaxies
• Tidal stirring and the origin of dwarf spheroidals in the Local Group
• Internal Dynamics, Structure and Formation of Dwarf Elliptical Galaxies: II. Rotating Versus Non-Rotating Dwarfs
• Growth of Galactic Bulges by Mergers: I. Dense Satellites
• Rotationally Supported Virgo Cluster Dwarf Elliptical Galaxies: Stripped Dwarf Irregular Galaxies?
• Evidence of fast rotation in dwarf elliptical galaxies
• Dwarf Spheroidal Galaxies : Keystones of Galaxy Evolution
• Environmental Effects in the Structural Parameters of Galaxies in the Coma Cluster
• Structural Parameters of Dwarf Galaxies in the Coma Cluster: On the Origin of dS0 Galaxies
• Lowered Evans Models: Analytic Distribution Functions of Oblate Halo Potentials
• Dwarf elliptical galaxies with kinematically decoupled cores
• Resonant capture, counter-rotating disks, and polar rings

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• The Signature of Galactic Tides in Local Group Dwarf Spheroidals
• The Preferential Tidal Stripping of Dark Matter versus Stars in Galaxies
• On the Origin of Dwarf Elliptical Galaxies: The Fundamental Plane
• The impact of galaxy harassment on the globular cluster systems of early-type cluster dwarf galaxies
• The Next Generation Virgo Cluster Survey. XII. Stellar Populations and Kinematics of Compact, Low-Mass Early-Type Galaxies from Gemini GMOS-IFU Spectroscopy
• A numerical study of interactions and stellar bars
• Virgo Cluster and field dwarf ellipticals in 3D: I. On the variety of stellar kinematic and line-strength properties
• Stellar Kinematics and Structural Properties of Virgo Cluster Dwarf Early-Type Galaxies from the SMAKCED Project. I. Kinematically Decoupled Cores and Implications for Infallen Groups in Clusters
• SDSS-IV MaNGA: Faint quenched galaxies I- Sample selection and evidence for environmental quenching
• Evidence for the disky origin of luminous Virgo dwarf ellipticals from the kinematics of their globular cluster systems
• Leavers and remainers: Galaxies split by group-exit
• The First Fall is the Hardest: The Importance of Peculiar Galaxy Dynamics at Infall Time for Tidal Stripping Acting at the Centers of Groups and Clusters
• Formation of Blue-cored Dwarf Early-type Galaxies in a Cluster Environment: a Kinematical Perspective
• Galaxies with kinematically distinct cores in Illustris
• Comments on a faint old stellar system at 150 kpc