The Nature of High ${[\mathrm{OIII}]}_{88\mu \mathrm{m}}$/${[\mathrm{CII}]}_{158\mu \mathrm{m}}$ Galaxies in the Epoch of Reionization: Low Carbon Abundance and a Top-Heavy IMF?

Harley Katz, Joakim Rosdahl, Taysun Kimm +11

ALMA observations of $z>6$ galaxies have revealed abnormally high [OIII]${}_{88\mu \mathrm{m}}$/[CII]${}_{158\mu \mathrm{m}}$ ratios and [CII]${}_{158\mu \mathrm{m}}$ deficits compared to local galaxies. Numero…