High redshift JWST predictions from IllustrisTNG: II. Galaxy line and continuum spectral indices and dust attenuation curves

Understand

We present predictions for high redshift ($z=2-10$) galaxy populations based on the IllustrisTNG simulation suite and a full Monte Carlo dust radiative transfer post-processing.

• Specifically, we discuss the ${\rm H}_{\alpha}$ and ${\rm H}_{\beta}$ + $[\rm O \,III]$ luminosity functions up to $z=8$.
• The predicted ${\rm H}_{\beta}$ + $[\rm O \,III]$ luminosity functions are consistent with present observations at $z\lesssim 3$ with $\lesssim 0.1\,{\rm dex}$ differences in luminosities.
• However, the predicted ${\rm H}_{\alpha}$ luminosity function is $\sim 0.3\,{\rm dex}$ dimmer than the observed one at $z\simeq 2$.