On the Formation of Compact Stellar Disks Around Sgr A*

Details On the Formation of Compact Stellar Disks Around Sgr A* On the Formation of Compact Stellar Disks Around Sgr A*

2008-05-21

arxiv.org/abs/0805.3274v2

Astronomy and Astrophysics

Astrophysics

12 pages, 2 figs, minor changes, ApJ Letters accepted

Scientific paper

10.1086/591471

The recent identification of one or two sub-parsec disks of young, massive stars orbiting the ~4e6 solar mass black hole Sgr A* has prompted an "in-situ" scenario for star formation in disks of gas formed from a cloud captured from the Galactic center environment. To date there has been no explanation given for the low angular momentum of the disks relative to clouds passing close to the center. Here we show that the partial accretion of extended Galactic center clouds, such as the 50 km/s giant molecular cloud, that temporarily engulf Sgr A* during their passage through the central region of the Galaxy provide a natural explanation for the angular momentum and surface density of the the observed stellar disks. The captured cloud material is gravitationally unstable and forms stars as it circularizes, potentially explaining the large eccentricity and range of inclinations of the observed stellar orbits. The application of this idea to the formation of the circumnuclear ring is also discussed.

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