I will present new results from a unique sample of ∼ 7000 narrow-band selected galaxies with strong Hβ+[Oiii] and [Oii] nebular emission lines from the High-z Emission Line Survey (HiZELS) between z ∼ 0.8 − 5.0. Our sample covers a wide range of stellar mass (Mstellar ∼ 107.5−12.0 M), rest-frame equivalent widths (EWrest ∼ 10 − 105 Å), and line luminosities. We study the evolution of the Hβ+[Oiii]- and [Oii]-selected stellar mass functions for the first time. We find a strong evolution matching with the stellar mass growth in the mainstream literature. I will also present new results of the EWrest evolution.
We find an increasing trend up to z ∼ 2 and z ∼ 3 for Hβ+[Oiii] and [Oii], respectively.
Interestingly, we find evidence for a slower evolution for z > 2 in the Hβ+[Oiii] EWrest and a decreasing trend for z > 3 in the [Oii] EWrest evolution. I will conclude with an analysis on the shifts in the EWrest evolution and what this implies about the changes in the [Oiii]/[Oii] line ratios, an indicator of the ionization parameter.