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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 10.

Sérsic decomposition of AzTEC-1’s F356W image (top left) which overlaps [N II]+Hα. These emission lines contribute ∼10% to the total flux. We show the model from a single Sérsic fit (1S, top right) which looks identical to a double Sérsic fit (2S). Residual maps are shown in units of SNR (bottom). Both Sérsic models converge to a point source dominated profile ﹩{n}_{{\rm{S}}\acute{{\rm{e}}}{\rm{rsic}}}\gg 10﹩. There is some evidence for residual asymmetric structure in the model-subtracted maps within the inner few kiloparsecs that could be attributable to an ionized outflow; however, the aggregate flux of this residual emission does not reproduce the total flux from broad Hα.

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