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Beyond the Dot: An LRD-like Nucleus at the Heart of an IR-bright Galaxy and its Implications for High-redshift LRDs

  • Authors: Pierluigi Rinaldi, George H. Rieke, Zihao Wu, Carys J. E. Gilbert, Fabio Pacucci, Luigi Barchiesi, Stacey Alberts, Stefano Carniani, Andrew J. Bunker, Rachana Bhatawdekar, Francesco D'Eugenio, Zhiyuan Ji, Benjamin D. Johnson, Kevin Hainline, Vasily Kokorev, Nimisha Kumari, Edoardo Iani, Jianwei Lyu, Roberto Maiolino, Eleonora Parlanti, Brant E. Robertson, Yang Sun, Cristian Vignali, Christina C. Williams, Christopher N. A. Willmer, Yongda Zhu

Pierluigi Rinaldi et al 2026 The Astrophysical Journal 1006 .

  • Provider: AAS Journals

Caption: Figure 1.

Top: on the left, we show the NIRSpec/PRISM spectrum of the Saguaro (from the DJA DAWN Archive; v4.4), with all prominent emission lines labeled. The expected position of the break, as defined by D. J. Setton et al. (2025), is marked in orchid. We also note the presence of [Ne IV]λλ2422, 2424, as already reported in higher-z LRDs (see, e.g., M. Tang et al. 2026). The Hα + [N II]λλ6548, 6583 complex (unresolved in the PRISM spectrum) is highlighted in gray. Its higher-resolution counterpart from the NIRSpec G235H/F170LP grating is shown in the top-right panel, along with the line model fits for both Hα and [N II]λλ6548, 6583 (although we highlight the limited data quality of this dataset). Finally, we show the NIRCam RGB image (3″ × 3) of the Saguaro with the slit overlaid, illustrating that the PRISM flux originates from the nuclear regions. Bottom: postage stamps (3″×3″) of the available HST and JWST filters for the Saguaro.

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