THE PREFERENTIAL TIDAL STRIPPING OF DARK MATTER VERSUS STARS IN GALAXIES

ABSTRACT Using high-resolution hydrodynamical cosmological simulations, we conduct a comprehensive study of how tidal stripping removes dark matter and stars from galaxies. We find that dark matter is always stripped far more significantly than the stars-galaxies that lose ∼80% of their dark matter,...

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Bibliographic Details
Published in:The Astrophysical journal 2016-12, Vol.833 (1), p.109
Main Authors: Smith, Rory, Choi, Hoseung, Lee, Jaehyun, Rhee, Jinsu, Sanchez-Janssen, Ruben, Yi, Sukyoung K.
Format: Article
Language:English
Subjects:
Astronomical models
Astrophysics
Computer simulation
Dark matter
Galactic clusters
Galactic evolution
Galaxies
galaxies: clusters: general
galaxies: evolution
galaxies: groups: general
galaxies: halos
galaxies: interactions
Mathematical models
methods: numerical
Stars
Stars & galaxies
Stripping
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Summary:ABSTRACT Using high-resolution hydrodynamical cosmological simulations, we conduct a comprehensive study of how tidal stripping removes dark matter and stars from galaxies. We find that dark matter is always stripped far more significantly than the stars-galaxies that lose ∼80% of their dark matter, typically lose only 10% of their stars. This is because the dark matter halo is initially much more extended than the stars. As such, we find that the stellar-to-halo size-ratio (measured using reff/rvir) is a key parameter controlling the relative amounts of dark matter and stellar stripping. We use simple fitting formulae to measure the relation between the fraction of bound dark matter and the fraction of bound stars. We measure a negligible dependence on cluster mass or galaxy mass. Therefore, these formulae have general applicability in cosmological simulations, and are ideal to improve stellar stripping recipes in semi-analytical models, and/or to estimate the impact that tidal stripping would have on galaxies when only their halo mass evolution is known.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/833/1/109