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25 April 2024 |
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The inner structure of early-type galaxies in the Illustris simulation | | Dandan Xu
; Volker Springel
; Dominique Sluse
; Peter Schneider
; Alessandro Sonnenfeld
; Dylan Nelson
; Mark Vogelsberger
; Lars Hernquist
; | | Date: |
24 Oct 2016 | | Abstract: | Early-type galaxies provide unique tests for the predictions of the cold dark
matter cosmology and the baryonic physics assumptions entering models for
galaxy formation. In this work, we use the Illustris simulation to study
correlations of three main properties of early-type galaxies, namely, the
stellar orbital anisotropies, the central dark matter fractions and the central
radial density slopes, as well as their redshift evolution since $z=1.0$. We
find that lower-mass galaxies or galaxies at higher redshift tend to be bluer
in rest-frame colour, have higher central gas fractions, and feature more
tangentially anisotropic orbits and steeper central density slopes than their
higher-mass or lower-redshift counterparts, respectively. The projected central
dark matter fraction within the effective radius shows no significant mass
dependence but positively correlates with galaxy effective radii due to the
aperture effect. The central density slopes obtained in the simulation by
combining strong lensing measurements with single aperture kinematics are found
to be shallower than the true density slopes. We identify systematic biases in
this measurement due to two common modelling assumptions, isotropic stellar
orbital distributions and power-law density profiles. We also compare the
properties of early-type galaxies in Illustris to those from the SLACS, SL2S
and BOSS surveys, finding in general broad agreement but also some tension,
which appears to be mostly caused by too large galaxy sizes in Illustris. | | Source: | arXiv, 1610.7605 | | Services: | Forum | Review | PDF | Favorites | |
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