Query : 2005A&A...433..405S

2005A&A...433..405S - Astronomy and Astrophysics, volume 433, 405-413 (2005/4-2)

On highly eccentric stellar trajectories interacting with a self-gravitating disc in Sgr A*.


Abstract (from CDS):

We propose that Kozai's phenomenon is responsible for the long-term evolution of stellar orbits near a supermassive black hole. We pursue the idea that this process may be driven by a fossil accretion disc in the centre of our Galaxy, causing the gradual orbital decay of stellar trajectories, while setting some stars on highly elliptic orbits. We evolve model orbits that undergo repetitive transitions across the disc over the period of ≃107-years. We assume that the disc mass is small compared to the central black hole, and its gravitational field comparatively weak, yet non-zero, and we set the present values of orbital parameters of the model star consistent with those reported for the S2 star in Sagittarius A*. We show how a model trajectory decays and circularizes, but at some point the mean eccentricity is substantially increased by Kozai's resonance. In consequence the orbital decay of highly eccentric orbits is accelerated. A combination of an axially symmetric gravitational field and dissipative environment can provide a mechanism explaining the origin of stars on highly eccentric orbits tightly bound to the central black hole. In the context of other S-stars, we can conclude that an acceptable mass of the disc (i.e., Md≲1 per cent of the black hole mass) is compatible with their surprisingly young age and small pericentre distances, provided these stars were formed at r≲105 gravitational radii.

Abstract Copyright:

Journal keyword(s): Galaxy: centre - accretion, accretion disks - black hole physics

CDS comments: S2 = [EG97] S2

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13665 0
2 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 4135 3
3 [EG97] S2 * 17 45 40.0442 -29 00 27.975           B0/2V 346 1

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