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| Paper: |
Dynamics and Origins of the Young Stars in the Galactic Center |
| Volume: |
439, The Galactic Center: a Window to the Nuclear Environment of Disk Galaxies |
| Page: |
172 |
| Authors: |
Perets, H. B. |
| Abstract: |
The environment near the massive black hole (MBH) in the Galactic
center is very hostile for star formation. Nevertheless, many young
stars (both O and B stars) are observed close the MBH. The B-stars
seems to have an isotropic, continuous distribution between 0.01 pc
and up to a pc. The O stars, in contrast, seem to be distributed in
a coherent disk like configuration, extending only between ∼0.04
pc to ∼0.5 pc. Our current understanding favors an in-situ formation
origin for the more massive (O and Wolf-Rayet) stars, in gaseous disk
and/or streams from an infalling gas clump. The B-stars seem to have
a different origin, more likely through a dynamical capture, following
binary disruption by the MBH. This scenario could also be able to
explain the origin of hypervelocity stars in the Galactic halo. These
and other possible origins of the young stars in the Galactic center
are briefly reviewed and their possible observational signatures and
constraints are detailed. |
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