Synthetic nebular emission from massive galaxies I: origin of the cosmic evolution of optical emission-line ratios

Michaela Hirschmann, Stephane Charlot, Anna Feltre +4

Galaxies occupy different regions of the [OIII]$\lambda 5007$/H$\beta$-versus-[NII]$\lambda 6584$/H$\alpha$ emission-line ratio diagram in the distant and local Universe. We investigate the o…