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

Antti Rantala, Pauli Pihajoki, Peter H. Johansson

Research output: Contribution to journalConference articleScientific


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.
Original languageEnglish
JournalProceedings of the International Astronomical Union
Issue numberS324
Pages (from-to)342-346
Number of pages5
Publication statusPublished - 1 May 2017
MoE publication typeB3 Article in conference proceedings
EventIAU Symposium: New Frontiers in Black Hole Astrophysics - Cankarjev dom, Ljubljana, Slovenia
Duration: 12 Sep 201616 Sep 2016
Conference number: 324

Fields of Science

  • 115 Astronomy, Space science

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