Population III Host Candidates at $z\sim 2$: Strong He II $\lambda 1640$ and Absent UV Metal Lines in HETDEX Ly$\alpha$ Emitters

Mahan Mirza Khanlari, Dustin Davis, Karl Gebhardt +15

Population III (Pop III) stars are expected to produce extremely hard ionizing spectra, yet direct evidence for their signature--strong narrow He II $\lambda 1640$ emission with wea…