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Title:
The Formation of Polar Disk Galaxies
Authors:
Brook, Chris B.; Governato, Fabio; Quinn, Thomas; Wadsley, James; Brooks, Alyson M.; Willman, Beth; Stilp, Adrienne; Jonsson, Patrik
Affiliation:
AA(Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195.), AB(Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195.), AC(Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195.), AD(Department of Physics and Astronomy, McMaster University, Hamilton, ON L88 4M1, Canada.), AE(Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195.), AF(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138; Clay Fellow.), AG(Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195.), AH(Physics Department, University of California, Santa Cruz, CA 95064.)
Publication:
The Astrophysical Journal, Volume 689, Issue 2, pp. 678-686. (ApJ Homepage)
Publication Date:
12/2008
Origin:
UCP
ApJ Keywords:
Cosmology: Theory, Galaxies: Evolution, Galaxies: Formation
DOI:
10.1086/591489
Bibliographic Code:
2008ApJ...689..678B

Abstract

Polar ring galaxies, such as NGC 4650A, are a class of galaxies that have two kinematically distinct components that are inclined by almost 90° to each other. These striking galaxies challenge our understanding of how galaxies form; the origin of their distinct components has remained uncertain and is the subject of much debate. We use high-resolution cosmological simulations of galaxy formation to show that polar ring galaxies are simply an extreme example of the misalignment of angular momentum that occurs during the hierarchical structure formation characteristic of a cold dark matter cosmology. In our model, polar ring galaxies form through the continuous accretion of gas whose angular momentum is misaligned with the central galaxy.
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