The properties of He IIλ1640 emitters at z ∼ 2.5–5 from the VANDELS survey A. Saxena, L. Pentericci, M. Mirabelli, D. Schaerer, R. Schneider, F. Cullen, R. Amorin, M. Bolzonella, A. Bongiorno, A. C. Carnall et al. (17 more) A&A, 636 (2020) A47 Published online: 15 April 2020 DOI: 10.1051/0004-6361/201937170