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Star-formation in nuclear clusters and the origin of the Galactic center apparent core distribution

Published online by Cambridge University Press:  07 March 2016

Danor Aharon  and
Hagai B. Perets
Danor Aharon
Affiliation:
Physics Department, Technion – Israel Institute of Technology, Haifa 3200003, Israel email: danor@tx.technion.ac.il
Hagai B. Perets
Affiliation:
Physics Department, Technion – Israel Institute of Technology, Haifa 3200003, Israel email: danor@tx.technion.ac.il
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Abstract

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Nuclear stellar clusters (NSCs) are known to exist around massive black holes (MBHs) in galactic nuclei. Two formation scenarios were suggested for their origin: build-up of NSCs and Continuous in-situ star-formation. Here we study the effects of star formation on the build-up of NSCs and its implications for their long term evolution and their resulting structure. We show that continuous star-formation can lead to the build-up of an NSC with properties similar to those of the Milky-way NSC. We also find that the general structure of the old stellar population in the NSC with in-situ star-formation could be very similar to the steady-state Bahcall-Wolf cuspy structure. However, its younger stellar population does not yet achieve a steady state. In particular, formed/evolved NSCs with in-situ star-formation contain differential age-segregated stellar populations which are not yet fully mixed. Younger stellar populations formed in the outer regions of the NSC have a cuspy structure towards the NSC outskirts, while showing a core-like distribution inwards; with younger populations having larger core sizes.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Issue S312: Star Clusters and Black Holes in Galaxies across Cosmic Time , August 2014 , pp. 282 - 285
Copyright
Copyright © International Astronomical Union 2016 

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