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KETJU: Post-Newtonian-Accurate Supermassive Black Hole Dynamics in GADGET-3

Published online by Cambridge University Press:  23 June 2017

Antti Rantala ,
Pauli Pihajoki  and
Peter H. Johansson
Antti Rantala
Affiliation:
Department of Physics, University of HelsinkiGustaf Hällstrmin katu 2A, 00560, Helsinki, Finland email: antti.rantala@helsinki.fi
Pauli Pihajoki
Affiliation:
Department of Physics, University of HelsinkiGustaf Hällstrmin katu 2A, 00560, Helsinki, Finland email: antti.rantala@helsinki.fi
Peter H. Johansson
Affiliation:
Department of Physics, University of HelsinkiGustaf Hällstrmin katu 2A, 00560, Helsinki, Finland email: antti.rantala@helsinki.fi
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Abstract

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We present KETJU, a new regularized tree code based on algorithmic chain regularization and implemented into Gadget-3. This new code is able to follow simultaneously galactic-scale dynamical and astrophysical processes and the small-scale supermassive black hole binary dynamics. We present here the general idea of this new code and show a test simulation of black hole binary dynamics in a galaxy merger of two massive elliptical galaxies. The separation of the black holes at the time of the merger is several orders of magnitude smaller in KETJU than when compared to ordinary Gadget-3 simulations. The merger timescale is also longer by 100 − 200 Myr.

Keywords

black hole physicsgalaxies: kinematics and dynamicsgalaxies: nucleimethods: n-body simulations
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S324: New Frontiers in Black Hole Astrophysics , September 2016 , pp. 342 - 346
Copyright
Copyright © International Astronomical Union 2017 

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