An extreme [OIII] emitter at $z=3.2$: a low metallicity Lyman continuum source

Understand

[Abridged] We investigate the physical properties of a Lyman continuum emitter candidate at $z=3.212$ with photometric coverage from $U$ to MIPS 24$\mu$m band and VIMOS/VLT and MOSFIRE/Keck spectroscopy.

• Investigation of the UV spectrum confirms a direct spectroscopic detection of the Lyman continuum emission with $S/N>5$.
• Non-zero Ly$\alpha$ flux at the systemic redshift and high Lyman-$\alpha$ escape fraction suggest a low HI column density.
• The weak C and Si low-ionization absorption lines are also consistent with a low covering fraction along the line of sight.