Intrinsic alignments of disk and elliptical galaxies in the MassiveBlack-II and Illustris simulations
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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 −1Mpc)3 and (75h −1Mpc)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 ∼ 0.1h −1Mpc, the intrinsic alignment two-point correlation functions for disk galaxies in both simulations are consistent with a null detection, unlike those for ellipticals.