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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 3.

AzTEC-1’s combined and slit-loss corrected NIRSPec/PRISM spectrum from EMBER (29 min) and ZENITH (1.1 hr) for a total of 1.6 hr of exposure time. The prism spectra from both programs have been individually slit-loss corrected by normalizing to HST and JWST photometry and then combined. The insets show the 18 minute G395M spectrum from EMBER capturing the Hα+[N II] complex, [S II] doublet, and [S III].

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