Two channels for the formation of compact dwarf galaxies in clusters of galaxies

Abstract

We have identified two channels for the formation of compact dwarf galaxies in the Illustris simulation by reconstructing mass and distance histories of candidates located in the vicinity of the simulation's most massive cluster galaxies. One channel is tidal stripping of Milky Way mass galaxies that form outside of clusters and eventually sink into them, spiraling in toward central massive objects. Second channel of formation is an in-situ formation (in reference to the parent cluster) of dwarf mass galaxies, with negligible evolution and limited change in stellar mass. We find 19 compact dwarf galaxies at the centers of 14 clusters, consistent with observations. 30% of them have external origin while 70% are formed in-situ.

11 pages, 8 figures. Accepted by MNRAS

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• Low-mass compact elliptical galaxies: spatially-resolved stellar populations and kinematics with the Keck Cosmic Web Imager
• Compact elliptical galaxies in different local environments: a mixture of galaxies with different origins?
• The formation pathways of compact elliptical galaxies
• Compact elliptical galaxies hosting active galactic nuclei in isolated environment
• Infrared variable stars in the compact elliptical galaxy M32
• Dark matter mass loss in galaxy flybys: dependence on impact parameter