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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 11.

NIRSpec/PRISM zoom-in on the [O III] doublet and nondetection of Hβ. The red line shows a model fitting only narrow [O III], but this fit is dominated by the PRISM line-spread function (blue). The expected offset broad component for [O III] based on the G395M Hα profile is shown as a shaded green region, which can be added to the model but with no discriminatory power given the resolution.

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