Published in

Oxford University Press (OUP), Monthly Notices of the Royal Astronomical Society, 3(488), p. 3298-3307, 2019

DOI: 10.1093/mnras/stz1839

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Dark-matter-deficient galaxies in hydrodynamical simulations

Journal article published in 2019 by Yingjie Jing, Chunxiang Wang, Ran Li ORCID, Shihong Liao ORCID, Jie Wang, Qi Guo, Liang Gao
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Data provided by SHERPA/RoMEO

Abstract

Abstract Low-mass galaxies are expected to be dark-matter-dominated even within their central regions. Recently, two observations reported two dwarf galaxies in a group environment with very little dark matter in their central regions. We explore the population and origins of dark-matter-deficient galaxies (DMDGs) using two state-of-the-art hydrodynamical simulations, the EAGLE and Illustris projects. For all satellite galaxies with 109 < M* < 1010 M$⊙$ in groups with M200 > 1013 M$⊙$, we find that about $2.6\, {\rm per\, cent}$ of them in EAGLE, and $1.5\, {\rm per\, cent}$ in Illustris are DMDGs with dark matter fractions below $50\, {\rm per\, cent}$ inside two times the half-stellar-mass radius. We demonstrate that DMDGs are highly tidally disrupted galaxies, and that because dark matter has a higher binding energy than stars, mass loss of the dark matter is much more rapid than that of stars in DMDGs during tidal interactions. If DMDGs were confirmed in observations, they are expected in current galaxy formation models.

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