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Using Hubble Space Telescope (HST)/Cosmic Origins Spectrograph (COS)observations of one of the most metal-poor dwarf star-forming galaxies (SFG) inthe local Universe, J2229+2725, we have discovered an extremely strong nebularCIV 1549, 1551 emission-line doublet, with an equivalent width of 43A, severaltimes higher than the value observed so far in low-redshift SFGs. Together withother extreme characteristics obtained from optical spectroscopy (oxygenabundance 12+log(O/H)=7.085+/-0.031, ratio O32 = I([OIII]5007)/I([OII]3727) ~53, and equivalent width of the Hbeta emission line EW(Hbeta) = 577A), thisgalaxy greatly increases the range of physical properties for dwarf SFGs at lowredshift and is a likely analogue of the high-redshift dwarf SFGs responsiblefor the reionization of the Universe. We find the ionizing radiation inJ2229+2725 to be stellar in origin and the high EW(CIV 1549,1551) to be due toboth extreme ionization conditions and a high carbon abundance, with acorresponding log C/O = -0.38, that is ~ 0.4 dex higher than the average valuefor nearby low-metallicity SFGs.

Extremely strong CIV 1550 nebular emission in the extremely low-metallicity star-forming galaxy J2229+2725