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JWST Reveals a Candidate Supermassive Black Hole Binary at z = 4.3 in the Brightest Submillimeter Galaxy in COSMOS-Web

  • Authors: Jed McKinney, Ansh Gupta, Julian B. Muñoz, John Chisholm, Caitlin M. Casey, Stephanie M. Urbano Stawinski, Olivia Cooper, Erini Lambrides, Hollis Akins, Maximilien Franco, Archana Aravindan, Seiji Fujimoto, Kohei Inayoshi, Andreas L. Faisst, Jeyhan S. Kartaltepe, Michael Boylan-Kolchin

Jed McKinney et al 2026 The Astrophysical Journal Letters 1011 .

  • Provider: AAS Journals

Caption: Figure 2.

PRISM spectra multiplied by the fraction of F356W emission in the ZENITH/EMBER overlap region relative to the total F356W flux measured in the slit aperture from each program. The difference between the scaled ZENITH and EMBER spectra (black line) is consistent with zero, indicating that the difference in total flux is an aperture effect arising from the offset slit placements as shown in Figure 1. The inset shows the filter transmission curve for F356W for reference.

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