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JWST Observations of the Double Nucleus in NGC 4486B: Possible Evidence for a Recent Binary SMBH Merger and Recoil

  • Authors: Behzad Tahmasebzadeh, Monica Valluri, Shashank Dattathri, Tatsuya Akiba, Fazeel Mahmood Khan, Matthew A. Taylor, Haruka Yoshino, Solveig Thompson, Ann-Marie Madigan, Frank C. van den Bosch, Kelly Holley-Bockelmann, Patrick Côté, Laura Ferrarese, Michael J. Drinkwater, Holger Baumgardt, Misty C. Bentz, Kristen Dage, Eric W. Peng, Somya Jha, Andrea V. Macciò, Chengze Liu, Tyrone E. Woods

Behzad Tahmasebzadeh et al 2026 The Astrophysical Journal Letters 1001 .

  • Provider: AAS Journals

Caption: Figure 4.

Expected GW recoil kick magnitude, Vkick, as a function of the premerger BH mass ratio, q. The thick purple line shows the mean, and the shaded region shows a 1σ confidence interval estimated via Monte Carlo simulations. The recoil kick required to induce the double nucleus of NGC 4486B is shown in the gray horizontal dashed line, and the mass of the corresponding premerger companion to NGC 4486B’s central SMBH is indicated on the top horizontal axis. The gray vertical dashed line marks q = 0.15, the lower-limit premerger BH mass ratio for NGC 4486B. Adapted from T. Akiba et al. (2025), who use the analytical prescription from C. O. Lousto et al. (2010, 2012).

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