Dynamical modeling of the stellar nucleus of M 31

Sambhus, N.; Sridhar, S.

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/4866

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DC Field	Value	Language
dc.contributor.author	Sambhus, N.	-
dc.contributor.author	Sridhar, S.	-
dc.date.accessioned	2012-07-11T06:25:34Z	-
dc.date.available	2012-07-11T06:25:34Z	-
dc.date.issued	2002	-
dc.identifier.citation	Astronomy & Astrophysics, 2002, Vol.388, p766	en
dc.identifier.issn	0004-6361	-
dc.identifier.issn	1432-0746 (Online)	-
dc.identifier.uri	http://hdl.handle.net/2289/4866	-
dc.description	Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)	en
dc.description.abstract	We present stellar dynamical models of the lopsided, double-peaked nucleus of M 31, derived from Hubble Space Telescope (HST) photometry. A Schwarzschild-type method, in conjunction with Richardson-Lucy deconvolution, was employed to construct steadily rotating, hot, stellar disks. The stars orbit a massive dark object, on prograde and retrograde quasi-periodic loop orbits. Our results support Tremaine's eccentric disk model, extended to include a more massive disk, non zero pattern speed ( $\Omega$), and different viewing angle. Most of the disk mass populated prograde orbits, with $\simeq$3.4% on retrograde orbits. The best fits to photometric and kinematic maps were disks with $\Omega\simeq 16\mbox{\,km\, s${}^{-1}$\, pc${}^{-1}$ }$ . We speculate on the origins of the lopsidedness, invoking recent work on the linear overstability of nearly Keplerian disks, that possess even a small amount of a counter - rotating component. Accretion of material - no more massive than a globular cluster - onto a preexisting stellar disk, will account for the mass in our retrograde orbits, and could have stimulated the lopsidedness seen in the nucleus of M 31.	en
dc.language.iso	en	en
dc.publisher	EDP Sciences	en
dc.relation.uri	http://dx.doi.org/10.1051/0004-6361:20020298	en
dc.relation.uri	http://adsabs.harvard.edu/abs/2002A%26A...388..766S	en
dc.relation.uri	http://arxiv.org/abs/astro-ph/0110274	en
dc.rights	2002 European Southern Observatory	en
dc.subject	galaxies	en
dc.subject	M 31 -- galaxies	en
dc.subject	kinematics and dynamics	en
dc.title	Dynamical modeling of the stellar nucleus of M 31	en
dc.type	Article	en
Appears in Collections:	Research Papers (A&A)

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