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Young stellar disks formed by the collision of a molecular cloud with a circumnuclear disk at the Galactic center

Published online by Cambridge University Press:  22 May 2014

C. Alig ,
M. Schartmann ,
A. Burkert  and
K. Dolag
C. Alig
Affiliation:
Universitäts-Sternwarte München, Scheinerstraße 1, D-81679 München, Germany email: schartmann@mpe.mpg.de Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, Giessenbachstr., D-85741 Garching, Germany
M. Schartmann
Affiliation:
Universitäts-Sternwarte München, Scheinerstraße 1, D-81679 München, Germany email: schartmann@mpe.mpg.de Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, Giessenbachstr., D-85741 Garching, Germany
A. Burkert
Affiliation:
Universitäts-Sternwarte München, Scheinerstraße 1, D-81679 München, Germany email: schartmann@mpe.mpg.de Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, Giessenbachstr., D-85741 Garching, Germany
K. Dolag
Affiliation:
Universitäts-Sternwarte München, Scheinerstraße 1, D-81679 München, Germany email: schartmann@mpe.mpg.de
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Abstract

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We suggest a new formation mechanism for the inclined, sub-parsec scale and counterrotating stellar disks observed around the central black hole in the Milky Way Galactic center. The simulation of a single molecular cloud crashing into a circumnuclear ring of gas leads to the inflow of multiple streams of gas towards the central parsec region. The time delayed arrival of those streams forms multiple, sub-parsec scale accretion disks, with angular momentum depending on the ratio of cloud and circumnuclear ring material. These accretion disks could then be the progenitors which fragmented into the observed stellar disks. A similar event might have also led to the creation of the so-called minispiral in the Galactic center.

Keywords

black hole physics — accretionaccretion disks — hydrodynamics — methods: numerical — ISM: clouds — Galaxy: center
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S303: The Galactic Center: Feeding and Feedback in a Normal Galactic Nucleus , October 2013 , pp. 185 - 187
Copyright
Copyright © International Astronomical Union 2014 

References

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