Local Analogs of Potential Ionizers of the Intergalactic Medium: Compact Star-Forming Galaxies with Intense CIV $λ$1550 Emission

Abstract: We performed spectroscopic analyses of five local compact star-forming galaxies (CSFGs) with extremely high [OIII]/OII ratios ($>20$). These targets remarkably share similar properties with high-redshift CIV emitters at $z>6$: high H$\beta$ equivalent widths (EWs $>200$\AA), extreme O${32}$ ratios, low metallicities (12+log(O/H) $\lesssim7.8$), low C/O abundances (log(C/O) $<-0.6$), and high ionization conditions (log$U>-2$). The UV spectra were acquired using the Hubble Space Telescope's (HST) Cosmic Origins Spectrograph (COS) and Space Telescope Imaging Spectrograph (STIS). We have identified a wealth of rest-frame UV emission lines (CIV, HeII, OIII], CIII]) in the HST spectra. Notably, all our targets show intense CIV emission lines with rest-frame EWs $>10$\AA, indicative of hard ionizing radiation. The rest-frame UV emission line diagnostics disfavor an AGN and could be consistent with significant shock contributions to the source of ionizing radiation. Four of our targets show high CIV/CIII] ratios ($\geq1.4$), suggestive of strong Lyman-continuum leakage (LyC escape fraction, $f{\rm esc,LyC}>10$%) from these sources. This is consistent with their Ly$\alpha$-inferred LyC escape fractions ($f_{\rm esc,LyC}=$ 9 - 31%). We derive relative C/O abundances from our sources, showing log(C/O) values from $-1.12$ to $-0.61$, comparable to those of reionization-era galaxies at $z\gtrsim6$. The properties of the CSFGs, particularly their intense CIV emission and high O$_{32}$ ratios, which suggest significant LyC escape fractions, are similar to those of the reionization-era CIV emitters. These similarities reinforce the hypothesis that these CSFGs are the closest analogs of significant contributors to the reionization of the intergalactic medium.