THE PREFERENTIAL TIDAL STRIPPING of DARK MATTER VERSUS STARS in GALAXIES

Rory Smith, Hoseung Choi, Jaehyun Lee, Jinsu Rhee, Ruben Sanchez-Janssen, Sukyoung K. Yi

Research output: Contribution to journalArticle

17 Citations (Scopus)

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 r eff /r vir ) 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.

Original languageEnglish
Article number109
JournalAstrophysical Journal
Volume833
Issue number1
DOIs
Publication statusPublished - 2016 Dec 10

Fingerprint

stripping
dark matter
stars
galaxies
halos
simulation
high resolution
estimates

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Smith, Rory ; Choi, Hoseung ; Lee, Jaehyun ; Rhee, Jinsu ; Sanchez-Janssen, Ruben ; Yi, Sukyoung K. / THE PREFERENTIAL TIDAL STRIPPING of DARK MATTER VERSUS STARS in GALAXIES. In: Astrophysical Journal. 2016 ; Vol. 833, No. 1.
@article{71afd3bce55447ee95f445b50ca20fef,
title = "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, 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 r eff /r vir ) 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.",
author = "Rory Smith and Hoseung Choi and Jaehyun Lee and Jinsu Rhee and Ruben Sanchez-Janssen and Yi, {Sukyoung K.}",
year = "2016",
month = "12",
day = "10",
doi = "10.3847/1538-4357/833/1/109",
language = "English",
volume = "833",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "1",

}

THE PREFERENTIAL TIDAL STRIPPING of DARK MATTER VERSUS STARS in GALAXIES. / Smith, Rory; Choi, Hoseung; Lee, Jaehyun; Rhee, Jinsu; Sanchez-Janssen, Ruben; Yi, Sukyoung K.

In: Astrophysical Journal, Vol. 833, No. 1, 109, 10.12.2016.

Research output: Contribution to journalArticle

TY - JOUR

T1 - THE PREFERENTIAL TIDAL STRIPPING of DARK MATTER VERSUS STARS in GALAXIES

AU - Smith, Rory

AU - Choi, Hoseung

AU - Lee, Jaehyun

AU - Rhee, Jinsu

AU - Sanchez-Janssen, Ruben

AU - Yi, Sukyoung K.

PY - 2016/12/10

Y1 - 2016/12/10

N2 - 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 r eff /r vir ) 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.

AB - 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 r eff /r vir ) 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.

UR - http://www.scopus.com/inward/record.url?scp=85006456151&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85006456151&partnerID=8YFLogxK

U2 - 10.3847/1538-4357/833/1/109

DO - 10.3847/1538-4357/833/1/109

M3 - Article

AN - SCOPUS:85006456151

VL - 833

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1

M1 - 109

ER -