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Kozai resonance model for Sagittarius A* stellar orbits

Published online by Cambridge University Press:  01 August 2006

Ladislav Šubr ,
Vladimír Karas  and
Jaroslav Haas
Ladislav Šubr
Affiliation:
Argelander Institut für Astronomie, University of Bonn, Bonn, Germany email: subr@sirrah.troja.mff.cuni.cz Charles University, Astronomical Institute, Prague, Czech Republic
Vladimír Karas
Affiliation:
Astronomical Institute, Academy of Sciences, Prague, Czech Republic
Jaroslav Haas
Affiliation:
Charles University, Astronomical Institute, Prague, Czech Republic
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Abstract

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We study a possibility of tidal disruptions of stars orbiting a supermassive black hole due to eccentricity oscillations driven by Kozai's mechanism. We apply the model to conditions relevant for the Galactic Centre where we consider two different sources of the perturbation to the central potential, which trigger the resonance mechanism. Firstly, it is a disc of young massive stars orbiting Sgr A* at r ≳ 0.08 pc, and, secondly, a molecular circumnuclear disc. Each of the two possibilities appears to be capable of exciting eccentricities to values sufficient for the tidal disruption of ∼100 stars from the nuclear stellar cluster on a time-scale of 0.1–10 Myrs. Tidally disrupted stars may cause periods of increased accretion activity of Sgr A*.

Keywords

Galaxy: center – stellar dynamics – celestial mechanics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S238: Black Holes from Stars to Galaxies – Across the Range of Masses , August 2006 , pp. 201 - 206
Copyright
Copyright © International Astronomical Union 2007

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