The MOSDEF Survey: Electron Density and Ionization Parameter at $z\sim 2.3$

Abstract

Using observations from the MOSFIRE Deep Evolution Field (MOSDEF) survey, we investigate the physical conditions of star-forming regions in $z\sim 2.3$ galaxies, specifically the electron density and ionization state. From measurements of the [O II]$\lambda \lambda$3726,3729 and [S II]$\lambda \lambda$6716,6731 doublets, we find a median electron density of $\sim 250$ cm${}^{-3}$ at $z\sim 2.3$, an increase of an order of magnitude compared to measurements of galaxies at $z\sim 0$. While $z\sim 2.3$ galaxies are offset towards significantly higher O${}_{32}$ values relative to local galaxies at fixed stellar mass, we find that the high-redshift sample follows a similar distribution to the low-metallicity tail of the local distribution in the O${}_{32}$ vs. R${}_{23}$ and O3N2 diagrams. Based on these results, we propose that $z\sim 2.3$ star-forming galaxies have the same ionization parameter as local galaxies at fixed metallicity. In combination with simple photoionization models, the position of local and $z\sim 2.3$ galaxies in excitation diagrams suggests that there is no significant change in the hardness of the ionizing spectrum at fixed metallicity from $z\sim 0$ to $z\sim 2.3$. We find that $z\sim 2.3$ galaxies show no offset compared to low-metallicity local galaxies in emission line ratio diagrams involving only lines of hydrogen, oxygen, and sulfur, but show a systematic offset in diagrams involving [N II]$\lambda$6584. We conclude that the offset of $z\sim 2.3$ galaxies from the local star-forming sequence in the [N II] BPT diagram is primarily driven by elevated N/O at fixed O/H compared to local galaxies. These results suggest that the local gas-phase and stellar metallicity sets the ionization state of star-forming regions at $z\sim 0$ and $z\sim 2$.

26 pages, 14 figures, accepted to ApJ

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