Models of Cuspy Triaxial Galaxies
نویسندگان
چکیده
منابع مشابه
Dynamics of Cuspy Triaxial Galaxies with a Supermassive
This talk provides a progress report on an extended collaboration which has aimed to address two basic questions, namely: Should one expect to see cuspy, triaxial galaxies in nature? And can one construct realistic cuspy, triaxial equilibrium models that are robust? Three technical results are described: (1) Unperturbed chaotic orbits in cuspy triaxial potentials can be extraordinarily sticky, ...
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This paper summarises an investigation of chaos in a toy potential which mimics much of the behaviour observed for the more realistic triaxial generalisations of the Dehnen potentials, which have been used to model cuspy triaxial galaxies both with and without a supermassive black hole. The potential is the sum of an anisotropic harmonic oscillator potential, Vo = 12 (a 2x2 + b2y2 + c2z2), and ...
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This paper continues an investigation of chaos and chaotic phase mixing in triaxial generalisations of the Dehnen potential which have been proposed to describe realistic ellipticals that have a strong density cusp and manifest significant deviations from axisymmetry. Earlier work is extended in three important ways, namely by exploring systematically the effects of (1) variable axis ratios, (2...
متن کاملTriaxial Galaxies with Cusps
We have constructed fully self-consistent models of triaxial galaxies with central density cusps. The triaxial generalizations of Dehnen's (1993) spherical mass models are presented, which have densities that vary as r −γ near the center and r −4 at large radii. We computed libraries of ∼ 7000 orbits in each of two triaxial models with γ = 1 (" weak cusp ") and γ = 2 (" strong cusp "); these tw...
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The Bekenstein-Milgrom gravity theory with a modified Poisson equation is tested here for the existence of triaxial equilibrium solutions. Using the nonnegative least square method, we show that self-consistent triaxial galaxies exist for baryonic models with a mild density cusp ρ ∼ Σ r . Self-consistency is achieved for a wide range of central concentrations, Σ ∼ 10 − 1000M⊙pc , representing l...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2001
ISSN: 0004-637X,1538-4357
DOI: 10.1086/319453