Cusps without chaos

Sridhar, S.; Touma, Jihad R.

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/4805

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DC Field	Value	Language
dc.contributor.author	Sridhar, S.	-
dc.contributor.author	Touma, Jihad R.	-
dc.date.accessioned	2012-07-10T09:58:25Z	-
dc.date.available	2012-07-10T09:58:25Z	-
dc.date.issued	1997	-
dc.identifier.citation	Monthly Notices of the Royal Astronomical Society, 1997, Vol.287, pL1-L4	en
dc.identifier.issn	0035-8711	-
dc.identifier.uri	http://hdl.handle.net/2289/4805	-
dc.description	Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)	en
dc.description.abstract	We present cuspy, non-axisymmetric, scale-free mass models of discs, whose gravitational potentials are of Stackel form in parabolic coordinates. A black hole may be added at the centre, without in any way affecting the Stackel form; the dynamics in these potentials is, of course, fully integrable. The surface density Sigma(disc) proportional to 1/r(gamma), where 0<gamma<1 corresponds to steep cusps for which the central force diverges. Thus cusps, black holes, and non-axisymmetry are not a sure recipe for chaos, as is generally assumed. A new family of orbits, lens orbits, emerges to replace the box orbits of models of elliptical galaxies that have constant-density cores. Loop orbits are conspicuous by their absence. Both lenses and bananas (the other family of orbits) can be elongated in the direction of the density distribution, a property that is favourable for the construction of non-axisymmetric, self-consistent equilibrium models of elliptical galaxies.	en
dc.language.iso	en	en
dc.publisher	Blackwell Publishing for the Royal Astronomical Society	en
dc.rights	1997 Blackwell Publishing for the Royal Astronomical Society	en
dc.subject	Galaxies	en
dc.subject	Elliptical and lenticular	en
dc.subject	Kinematics and dynamics	en
dc.title	Cusps without chaos	en
dc.type	Article	en
Appears in Collections:	Research Papers (A&A)

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