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Self-consistent massive disks in triaxial dark matter halos

Bailin, Jeremy and Simon, Joshua D. and Bolatto, Alberto D. and Gibson, Brad K. and Power, Chris (2007) Self-consistent massive disks in triaxial dark matter halos. Astrophysical Journal, 667 (1). pp. 191-201. ISSN 0004-637X.

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Galactic disks in triaxial dark matter halos become deformed by the elliptical potential in the plane of the disk in such a way as to counteract the halo ellipticity. We develop a technique to calculate the equilibrium configuration of such a disk in the combined disk-halo potential, which is based on the method of Jog but accounts for the radial variation in both the halo potential and the disk ellipticity. This crucial ingredient results in qualitatively different behavior of the disk: the disk circularizes the potential at small radii, even for a reasonably low disk mass. This effect has important implications for proposals to reconcile cuspy halo density profiles with low surface brightness galaxy rotation curves using halo triaxiality. The disk ellipticities in our models are consistent with observational estimates based on two-dimensional velocity fields and isophotal axis ratios.

Item Type:Article
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URLURL TypeDescription
Bolatto, Alberto D.0000-0002-5480-5686
Additional Information:© 2007. The American Astronomical Society. Received 2007 April 2; accepted 2007 June 9. J. B. thanks the Australian Research Council for financial support. J. D. S. acknowledges the support of a Millikan Fellowship provided by Caltech. B. K. G. and C. P. gratefully acknowledge the support of the Australian Research Council–supported "Commonwealth Cosmology Initiative," DP 0665574. We thank Milo Milosavljevi and Darren Croton for helpful conversations and the referee, Chanda Jog, for a very useful report.
Funding AgencyGrant Number
Australian Research CouncilDP 0665574
Caltech Millikan FellowshipUNSPECIFIED
Subject Keywords:dark matter; galaxies: halos; galaxies: kinematics and dynamics; galaxies: spiral; galaxies: structure; methods: numerical
Issue or Number:1
Record Number:CaltechAUTHORS:20090419-200727928
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:14017
Deposited By: Joy Painter
Deposited On:21 Apr 2009 21:51
Last Modified:03 Oct 2019 00:46

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