Warped Galaxies From Misaligned Angular Momenta

Article, Preprint English OPEN
Debattista, Victor P. ; Sellwood, J. A. (1999)
  • Publisher: The American Astronomical Society
  • Related identifiers: doi: 10.1086/311913
  • Subject: F500 | Astrophysics
    arxiv: Astrophysics::Galaxy Astrophysics | Astrophysics::Cosmology and Extragalactic Astrophysics | Astrophysics::Earth and Planetary Astrophysics

A galaxy disk embedded in a rotating halo experiences a dynamical friction force which causes it to warp when the angular momentum axes of the disk and halo are misaligned. Our fully self-consistent simulations of this process induce long-lived warps in the disk which mimic Briggs's rules of warp behavior. They also demonstrate that random motion within the disk adds significantly to its stiffness. Moreover, warps generated in this way have no winding problem and are more pronounced in the extended \h1 disk. As emphasized by Binney and his co-workers, angular momentum misalignments, which are expected in hierarchical models of galaxy formation, can account for the high fraction of warped galaxies. Our simulations exemplify the role of misaligned spins in warp formation even when the halo density is not significantly flattened.
  • References (26)
    26 references, page 1 of 3

    Barnes, J., & Efstathiou, G. 1987, ApJ, 319, 575

    Binney, J. 1992, ARA&A, 30, 51

    Binney, J., Jiang, I.-G., & Dutta, S. 1998, MNRAS, 297, 1237

    Binney, J., & Tremaine, S. 1987, Galactic Dynamics (Princeton: Princeton Univ. Press)

    Bosma, A. 1991, in Warped Disks and Inclined Rings around Galaxies, ed. S. Casertano, P. D. Sackett, & F. H. Briggs (Cambridge: Cambridge Univ. Press), 181

    Briggs, F. H. 1990, ApJ, 352, 15

    Debattista, V. P., & Sellwood, J. A. 1998, ApJ, 493, L5

    Dekel, A., & Shlosman, I. 1983, in IAU Symp. 100, Internal Kinematics and Dynamics of Galaxies, ed. E. Athanassoula (Dordrecht: Kluwer), 187

    Dubinski, J., & Kuijken, K. 1995, ApJ, 442, 492

    Hunter, C., & Toomre, A. 1969, ApJ, 155, 747

  • Related Research Results (1)
    Inferred
    Physics and Astronomy (2012)
    43%
  • Metrics
    No metrics available
Share - Bookmark