Image Details
Caption: Figure 3.
Left panel: selection of narrow absorption features seen in the LRIS spectrum of SN 2025mkn (here showing the continuum normalized Keck/LRIS spectrum from 2025 June 24). The spectrum shows absorption features from the lens galaxy at z = 0.420 (blue lines), as well as from systems at z = 1.256 (green) and z = 1.371 (red lines). Right panel: JWST/NIRSpec spectra of SN 2025mkn Images A and B (black lines). The red lines show SN 2023ixf, redshifted to z = 1.371 and scaled to match SN 2025mkn.
© 2026. The Author(s). Published by the American Astronomical Society.