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Accurate Simulations of Binary Black Hole Mergers in Force-free Electrodynamics

Alic, Daniela and Moesta, Philipp and Rezzolla, Luciano and Zanotti, Olindo and Jaramillo, José Luis (2012) Accurate Simulations of Binary Black Hole Mergers in Force-free Electrodynamics. Astrophysical Journal, 754 (1). Art. No. 36. ISSN 0004-637X.

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We provide additional information on our recent study of the electromagnetic emission produced during the inspiral and merger of supermassive black holes when these are immersed in a force-free plasma threaded by a uniform magnetic field. As anticipated in a recent letter, our results show that although a dual-jet structure is present, the associated luminosity is ~100 times smaller than the total one, which is predominantly quadrupolar. Here we discuss the details of our implementation of the equations in which the force-free condition is not implemented at a discrete level, but rather obtained via a damping scheme which drives the solution to satisfy the correct condition. We show that this is important for a correct and accurate description of the current sheets that can develop in the course of the simulation. We also study in greater detail the three-dimensional charge distribution produced as a consequence of the inspiral and show that during the inspiral it possesses a complex but ordered structure which traces the motion of the two black holes. Finally, we provide quantitative estimates of the scaling of the electromagnetic emission with frequency, with the diffused part having a dependence that is the same as the gravitational-wave one and that scales as L^(non-coll)_(EM) ≈ Ω^((10/3)–(8/3)), while the collimated one scales as L^(coll)_(EM) ≈ Ω^((5/3)–(6/3)), thus with a steeper dependence than previously estimated. We discuss the impact of these results on the potential detectability of dual jets from supermassive black holes and the steps necessary for more accurate estimates.

Item Type:Article
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URLURL TypeDescription Paper
Moesta, Philipp0000-0002-9371-1447
Additional Information:© 2012 The American Astronomical Society. Received 2012 April 7; accepted 2012 May 9; published 2012 July 3. We thank L. Lehner and C. Palenzuela for insightful discussions on the analysis of the radiated quantities. We are grateful to E. Schnetter for his help in the implementation of the RKIMEX methods, I. Hinder and B. Wardell for some of the analysis tools used in this work, and E. Bentivegna and K. Dionysopoulou for help with the visualization of the currents and charges. This work was supported in part by the DFG grant SFB/Transregio 7; the computations were made at the AEI and on the TERAGRID network (TG-MCA02N014).
Funding AgencyGrant Number
Deutsche Forschungsgemeinschaft (DFG)SFB/Transregio7
Subject Keywords:binaries: close; galaxies: jets; gravitation; magnetic fields; plasmas; relativistic processes
Issue or Number:1
Record Number:CaltechAUTHORS:20120803-111031539
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Official Citation:Accurate Simulations of Binary Black Hole Mergers in Force-free Electrodynamics Daniela Alic et al. 2012 ApJ 754 36
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:32917
Deposited By: Aucoeur Ngo
Deposited On:03 Aug 2012 22:46
Last Modified:09 Mar 2020 13:19

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