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29 March 2024 |
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Intrinsic alignments of disk and elliptical galaxies in the MassiveBlack-II and Illustris simulations | Ananth Tenneti
; Rachel Mandelbaum
; Tiziana Di Matteo
; | Date: |
Fri, 23 Oct 2015 19:38:22 GMT (1873kb,D) | Abstract: | We study the shapes and intrinsic alignments of disks and elliptical galaxies
in the MassiveBlack-II (MBII) and Illustris cosmological hydrodynamic
simulations, with volumes of ($100h^{-1}$Mpc)$^{3}$ and ($75h^{-1}$Mpc)$^{3}$
respectively. We find that simulated disk galaxies are more oblate in shape and
more misaligned with the shape of their host dark matter subhalo when compared
with ellipticals. The disk major axis is found to be oriented towards the
location of nearby elliptical galaxies. We also find that the disks are thinner
in MBII and misalignments with dark matter halo orientations are smaller in
both disks and ellipticals when compared with Illustris. As a result, the
intrinsic alignment correlation functions at fixed mass have a higher amplitude
in MBII than in Illustris. Despite significant differences in the treatments of
hydrodynamics and baryonic physics in the simulations, we find that the
correlation functions scale similarly with transverse separation (yet both have
a different scale dependence to the correlation functions of the shapes of dark
matter subhalos within the same simulation). This is true for both disks and
ellipticals. This result makes it likely that we should be able to use
information from hydrodynamic simulations to understand intrinsic alignment
two-point statistics. Finally, in scales above $sim 0.1h^{-1}$Mpc, the
intrinsic alignment two-point correlation functions for disk galaxies in both
simulations are consistent with a null detection, unlike those for ellipticals. | Source: | arXiv, 1510.7024 | Services: | Forum | Review | PDF | Favorites |
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