Image Details
Caption: Figure 1.
Top: 5″ × 5″ NIRCam and MIRI cutouts of CAPERS-LRD-z9 in the PRIMER-COSMOS NIRCam and COSMOS-3D MIRI images. We also show RGB images generated for both the short-wavelength and long-wavelength NIRCam detectors. We overplot the NIRSpec MSA slitlet. Bottom: we plot the 2D and 1D photometrically calibrated spectra of CAPERS-LRD-z9 in fλ. We mark strongly detected emission features with red dashed lines and overplot the NIRCam photometry with blue squares. Despite being near the corner of the central shutter in the slitlet, CAPERS-LRD-z9 exhibits a detectable Lyα break, a strong Balmer break, and clear rest-optical emission line detections, including broadened Hβ and Hγ and narrow [O III] λλ4959, 5007. The combination of narrow forbidden lines and a broad Hβ clearly indicates that CAPERS-LRD-z9 is a BLAGN at z = 9.288.
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© 2025. The Author(s). Published by the American Astronomical Society.
