Shapes of stellar systems and dark halos from simulations of galaxy major mergers

Gregory S. Novak*, Thomas J. Cox, Joel R. Primack, Patrik Jonsson, Avishai Dekel

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

Using a sample of 89 snapshots from 58 hydrodynamic binary galaxy major merger simulations, we find that stellar remnants are mostly oblate while dark matter halos are mostly prolate or triaxial. The stellar minor axis and the halo major axis are almost always nearly perpendicular. This can be understood by considering the influence of angular momentum and dissipation during the merger. If binary mergers of spiral galaxies are responsible for the formation of elliptical galaxies or some subpopulation thereof, these galaxies can be expected to be oblate and inhabit their halos with the predicted shapes and orientations. These predictions are relevant to observational studies of weak gravitational lensing, where one must stack many optically aligned galaxies in order to determine the shape of the resulting stacked mass distribution. The simple relationship between the dark and luminous matter presented here can be used to guide the stacking of galaxies to minimize the information lost.

Original languageEnglish
Pages (from-to)L9-L12
JournalAstrophysical Journal
Volume646
Issue numberII
DOIs
StatePublished - 20 Jul 2006

Keywords

  • Galaxies: formation
  • Galaxies: interactions
  • Galaxies: kinematics and dynamics
  • Galaxies: structure

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