Extreme Nebular Conditions in the Early Universe with JWST
The first galaxies observed by the James Webb Space Telescope (JWST) do not look like simple younger versions of galaxies in the nearby Universe. Their nebular spectra indicate …
Implications of Broad [OIII]4364 and UV Line Emission in Two Little Red Dots at z ~ 7 - 8
We present deep, NIRSpec G140M and G395M spectroscopy of Little Red Dots (LRDs) at z = 6.68 and z = 8.35. Both LRDs show broad Balmer and [O III]λ4364 emission. The broad [O …
casey-papovich
Optical Strong Line Ratios Cannot Distinguish Between Stellar Populations and Accreting Black Holes at High Ionization Parameters and Low Metallicities
High-redshift observations from JWST indicate that optical strong line ratios do not carry the same constraining power as they do at low redshifts. Critically, this prevents a …
nikko-j.-cleri