SIMBAD references

2003ApJ...590L..33L - Astrophys. J., 590, L33-L36 (2003/June-2)

Stellar disk in the Galactic center: a remnant of a dense accretion disk.


Abstract (from CDS):

Observations of the Galactic center revealed a population of young massive stars within 0.4 pc from Sgr A*–the presumed location of a supermassive black hole. The origin of these stars is a puzzle as their formation in situ should be suppressed by the black hole's tidal field. We find that out of 13 stars whose three-dimensional velocities have been measured by Genzel et al., 10 lie in a thin disk. The half-opening angle of the disk is consistent with zero within the measurement errors and does not exceed 10°. We propose that a recent burst of star formation has occurred in a dense gaseous disk around Sgr A*. Such a disk is no longer present because, most likely, it has been accreted by the central black hole.

The three-dimensional orbit of S2, the young star closest to Sgr A*, has been recently mapped out with high precision. It is inclined to the stellar disk by 75°. We find that the orbit should undergo Lense-Thirring precession with the period of ~(6/a)x106 yr, where a<1 is the dimensionless spin of the black hole. Therefore, it is possible that originally the S2 orbit lay in the disk plane. The Lense-Thirring precession can turn the S2 orbit by 75° if a>0.2(tS2/6x106yr)–1, where tS2is the age of S2.

Abstract Copyright:

Journal keyword(s): Accretion, Accretion Disks - Galaxy: Center - Stars: Formation

Simbad objects: 16

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