James Webb Space Telescope Feed Post

Harvard ADS: Efficient Ionizers with Low H\boldsymbol{\beta}+[OIII] Equivalent Widths: JADES Spectroscopy of a Peculiar High-z Population

Paper abstract: Early JWST photometric studies discovered a population of UV faint (\rm 700\r{A}) exclude the most metal-poor efficient ionizers and favor 1) more chemically enriched systems with comparable extreme radiation fields and 2) older starbursting systems. In contrast, metallicity degeneracies are reduced in H\alpha space, enabling the identification of these metal-poor efficient ionizers by their specific star-formation rate.