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Studies measuring the chemical abundances of the neutral gas in star-forminggalaxies (SFGs) require ionization correction factors (ICFs) to accuratelymeasure their metal contents. In the work presented here we calculate newlyimproved ICFs for a sample of SFGs. These new corrections include both thecontaminating ionized gas along the line of sight (ICF$_{\rm ionized}$) andunaccounted higher ionization stages in the neutral gas (ICF$_{\rm neutral}$).We make use of recently acquired spectroscopic observations taken with theCosmic Origins Spectrograph (COS) on board Hubble to measure column densitiesfor Fe II and Fe III. Using the Fe III/Fe II ratios as well as other physicalproperties (i.e. $\log$[L$_{\rm UV}$], $N$(H I), T, and $Z$) we generate ad-hocphotoionization models with CLOUDY to quantify the corrections required foreach of the targets. We identify a luminosity threshold of $\log$[L$_{\rmUV}$]$\sim$ 40.75 erg s$^{-1}$ above which the ICF$_{\rm neutral}$ values fornitrogen are relatively higher (ICF$_{\rm neutral}=0.05$-0.7) than those forthe rest of the elements (ICF$_{\rm neutral}\sim 0.01$). This behaviorindicates that for the high UV luminosity objects, N II is found innon-negligible quantities in the neutral gas, making these ICF$_{\rm neutral}$corrections critical for determining the true abundances in the interstellarmedium. In addition, we calculate ICFs from a uniform grid of models covering awide range of physical properties typically observed in studies of SFGs andextragalactic H II regions. We provide the community with tabulated ICF valuesfor the neutral gas abundances measured from a variety of environments andapplicable to chemical studies of the high redshift universe.

astrophysical journal/the astrophysical journal

Newly Improved Ionization Corrections for the Neutral Interstellar  Medium: Enabling Accurate Abundance Determinations in Star-forming Galaxies  throughout the Universe