Modelling the number density of Hα emitters for future spectroscopic near-IR space missions L. Pozzetti, C. M. Hirata, J. E. Geach, A. Cimatti, C. Baugh, O. Cucciati, A. Merson, P. Norberg and D. Shi A&A, 590 (2016) A3 Published online: 28 April 2016 DOI: 10.1051/0004-6361/201527081