On Universal Halos and the Radial Orbit Instability | Zendy

J. D. MacMillan | Zendy; Lawrence M. Widrow | Zendy; R. N. Henriksen | Zendy

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On Universal Halos and the Radial Orbit Instability

Author(s) -

J. D. MacMillan,

Lawrence M. Widrow,

R. N. Henriksen

Publication year - 2006

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/508602

Subject(s) - instability , physics , perturbation (astronomy) , halo , orbit (dynamics) , cutoff , classical mechanics , circular orbit , astrophysics , mechanics , astronomy , quantum mechanics , galaxy , engineering , aerospace engineering

The radial orbit instability drives dark matter halos toward a universalstructure. This conclusion, first noted by Huss, Jain, and Steinmetz, isexplored in detail through a series of numerical experiments involving thecollapse of an isolated halo into the non-linear regime. The role played by theradial orbit instability in generating the density profile, shape, and orbitstructure is carefully analyzed and, in all cases, the instability leads touniversality independent of initial conditions. New insights into theunderlying physics of the radial orbit instability are presented.Comment: 31 pages, 11 figures, submitted to the Astrophysical Journa

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