US National Gemini Office
@usngo.bsky.social
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The US NGO at NSF NOIRLab supports Gemini Observatory users in the stages of the astronomical observing cycle, from proposal to data reduction. Visit our website at noirlab.edu/science/programs/csdc/u….
![A two-panel line graph displaying Normalized Continuum-Subtracted Flux (0 to 10) versus Rest Wavelength (4000 to 5500 Å). The top panel is labeled t/t_d < 4, and the bottom is t/t_d > 4. Multiple spectra are plotted and color-coded by an L_{7300}/L_{6300} ratio ranging from 0 (dark purple) to 4 (yellow-green). Vertical dashed lines mark specific emission features: H_gamma, [O III], Mg I, H_beta, and a second [O III] region. In the top panel, spectra with higher ratios (yellow/green) exhibit strong, broad emission peaks at the marked hydrogen and oxygen lines. In the bottom panel, spectra are predominantly lower ratio (purple/blue) and exhibit generally weaker, narrower emission features, though sharp [O III] and H_beta peaks are still visible.](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:ypf46tvmlk77b2x4coe3ceir/bafkreice3vxqkutqohsbw5f3bf6ymsm2sj5h5ze55zz5bpabbfi7sdusju)
![A figure with four main quadrants, displaying multiple overlaid line graphs plotting "Normalized Flux" against "Rest Wavelength." The left quadrants show optical spectra between 4400 and 5600 Angstroms, while the right quadrants display near-infrared spectra between 1.5 and 2.4 micrometers.
Colored lines represent different supernovae—including 2011fe, 2013aa, 2014J, and 2017cbv—observed at late epochs, ranging from approximately 300 to 570 days past peak brightness. Vertical tick marks identify specific iron emission lines, categorized into [Fe II] and [Fe III], with specific wavelengths labeled (e.g., 4658 Angstroms and 1.6440 micrometers). The plots compare the emission features of these astronomical objects, showing overall similarities in their broad spectral line profiles.](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:ypf46tvmlk77b2x4coe3ceir/bafkreihs6q6w6zfjflusackrks5jhsxqycesrkmbtsln6z47ewljfdiesu)