A theoretical investigation of far-infrared fine structure lines at $z>6$ and of the origin of the [OIII]88/[CII]158 enhancement

Camilla T. Nyhagen, Alice Schimek, Claudia Cicone +2

[Abridged] The [OIII]${}_{88\hat{I}¼m}$/[CII]${}_{158\hat{I}¼m}$ and [OIII]${}_{88\hat{I}¼m}$/[NII]${}_{122\hat{I}¼m}$ luminosity ratios have shown to be promising tracers of the ionisation state and gas-phase me…