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Title:
Internal Alignment of the Halos of Disk Galaxies in Cosmological Hydrodynamic Simulations
Authors:
Bailin, Jeremy; Kawata, Daisuke; Gibson, Brad K.; Steinmetz, Matthias; Navarro, Julio F.; Brook, Chris B.; Gill, Stuart P. D.; Ibata, Rodrigo A.; Knebe, Alexander; Lewis, Geraint F.; Okamoto, Takashi
Affiliation:
AA(Centre for Astrophysics and Supercomputing, Swinburne University of Technology, P.O. Box 218, Hawthorn, VIC 3122, Australia; .), AB(Centre for Astrophysics and Supercomputing, Swinburne University of Technology, P.O. Box 218, Hawthorn, VIC 3122, Australia; .; Carnegie Observatories, 813 Santa Barbara Street, Pasadena, CA 91101.), AC(Centre for Astrophysics and Supercomputing, Swinburne University of Technology, P.O. Box 218, Hawthorn, VIC 3122, Australia; .), AD(Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany.), AE(Department of Physics and Astronomy, University of Victoria, P.O. Box 3055, Station CSC, Victoria, BC V8W 3P6, Canada.), AF(Département de Physique, de Génie Physique et d'Optique, Université Laval, Québec, QC G1K 7P4, Canada.), AG(Centre for Astrophysics and Supercomputing, Swinburne University of Technology, P.O. Box 218, Hawthorn, VIC 3122, Australia; .), AH(Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France.), AI(Centre for Astrophysics and Supercomputing, Swinburne University of Technology, P.O. Box 218, Hawthorn, VIC 3122, Australia; .; Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany.), AJ(School of Physics, University of Sydney, NSW 2006, Australia.), AK(Institute for Computational Cosmology, Department of Physics, Durham University, South Road, Durham DH1 3LE, UK.; National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan.)
Publication:
The Astrophysical Journal, Volume 627, Issue 1, pp. L17-L20. (ApJL Homepage)
Publication Date:
07/2005
Origin:
UCP
ApJ Keywords:
Cosmology: Dark Matter, Galaxies: Evolution, Galaxies: Formation, Galaxies: Halos, Galaxies: Spiral
DOI:
10.1086/432157
Bibliographic Code:
2005ApJ...627L..17B

Abstract

Seven cosmological hydrodynamic simulations of disk galaxy formation are analyzed to determine the alignment of the disk within the dark matter halo and the internal structure of the halo. We find that the orientation of the outer halo, beyond ~0.1rvir, is unaffected by the presence of the disk. In contrast, the inner halo is aligned such that the halo minor axis aligns with the disk axis. The relative orientations of these two regions of the halo are uncorrelated. The alignment of the disk and inner halo appears to take place simultaneously through their joint evolution. The lack of connection between these two regions of the halo should be taken into account when modeling tidal streams in the halos of disk galaxies and when calculating intrinsic alignments of disk galaxies based on the properties of dark matter halos.
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