NGC 6240 supermassive black hole binary dynamical evolution based on Chandra data
Sobolenko M. Kompaniiets O. Berczik P. Marchenko V. Vasylenko A. Fedorova E. Shukirgaliyev B.
1 December 2022Oxford University Press
Monthly Notices of the Royal Astronomical Society
2022#517Issue 21791 - 1802 pp.
The main idea of our research is to estimate the physical coalescence time of the double supermassive black hole (SMBH) system in the centre of NGC 6240 based on the X-ray observations from the Chandra space observatory. The spectra of the northern and southern nuclei were fitted by spectral models from Sherpa and both presented the narrow component of the Fe Kα emission line. It enabled us to apply the spectral model to these lines and to find relative offset ≈0.02 keV. The enclosed dynamical mass of the central region of NGC 6240 with radius 1 kpc was estimated ≈ 2.04 × 1011 M☉. These data allowed us to carry on the high-resolution direct N-body simulations with Newtonian and post-Newtonian (up to 2.5PN correction) dynamics for this particular double SMBH system. As a result, from our numerical models, we approximated the central SMBH binary merging time for the different binary eccentricities. In our numerical parameters range, the upper limit for the merging time, even for the very small eccentricities, is still below ≈70 Myr. Gravitational waveforms and amplitude-frequency pictures from such events can be detected using pulsar timing array projects at the last merging phase.
black hole physics , galaxies: active , galaxies: individual: NGC 6240 , galaxies: kinematics and dynamics , gravitational waves , X-rays: galaxies
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Main Astronomical Observatory, National Academy of Sciences of Ukraine, 27 Akademika Zabolotnoho St, Kyiv, 03143, Ukraine
Institute of Physics, National Academy of Sciences of Ukraine, 46 av. Nauky, Kyiv, 03028, Ukraine
Astronomisches Rechen-Institut, Zentrum für Astronomie, University of Heidelberg, Mönchhofstrasse 12-14, Heidelberg, D-69120, Germany
Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Eötvös Loránd Research Network (ELKH), MTA Centre of Excellence, Konkoly Thege Miklós út 15-17, Budapest, 1121, Hungary
Astronomical Observatory, Jagiellonian University, 171 ul. Orla, Krakow, PL-30-244, Poland
Astronomical Observatory, National Taras Shevchenko University of Kyiv, 3 Observatorna str., Kyiv, 04053, Ukraine
INAF-Osservatorio Astronomico di Roma, via Frascati 33, Monte Porzio Catone, I-00078, Italy
INAF-Osseravatorio Astrofisico di Catania, Universita di Catania, Catania, I-95123, Italy
Energetic Cosmos Laboratory, Nazarbayev University, 53 Kabanbay Batyr ave, Nur-Sultan, 010000, Kazakhstan
Laboratory of Cosmology, Stellar Dynamics and Computational Astrophysics, Fesenkov Astrophysical Institute, 23 Observatory str, Almaty, 050020, Kazakhstan
Faculty of Physics and Technology, Al-Farabi Kazakh National University, 71 Al-Farabi ave, Almaty, 050020, Kazakhstan
Main Astronomical Observatory
Institute of Physics
Astronomisches Rechen-Institut
Konkoly Observatory
Astronomical Observatory
Astronomical Observatory
INAF-Osservatorio Astronomico di Roma
INAF-Osseravatorio Astrofisico di Catania
Energetic Cosmos Laboratory
Laboratory of Cosmology
Faculty of Physics and Technology
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