© Copyright 2022 IOP PublishingCedrés, B.Pérez García, A. M.Pérez Martínez, R.Cerviño, M.Gallego, J.Bongiovanni, Á.Cepa, J.Navarro Martínez, R.Nadolny, J.Lara López, M. A.2022-05-062022-05-062021-07-01The Astrophysical Journal Letters 915(1): L17(2021)0004-637Xhttps://iopscience.iop.org/article/10.3847/2041-8213/ac0a7ehttp://hdl.handle.net/20.500.12666/749We present the analysis of a sample of Hα, Hβ, and [O ii] emission line galaxies from the OTELO survey, with masses typically below $\mathrm{log}({M}_{* }/{M}_{\odot })\sim 9.4$ and redshifts between z ∼ 0.4 and 1.43. We study the star formation rate, star formation rate density, and their number density and evolution with redshift. We obtain a robust estimate of the specific star formation rate—stellar mass relation based on the lowest-mass sample published so far. We also determine a flat trend of the star formation rate density (SFRD) and number density with redshift. Our results suggest a scenario of no evolution of the number density of galaxies, regardless of their masses, up to redshift z ∼ 1.4. This implies a gradual change of the relative importance of the star-forming processes, from high-mass galaxies to low-mass galaxies, with decreasing redshift. We also find little or no variation of the SFRD in the redshift range of 0.4 < z < 1.43.engAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttps://creativecommons.org/licenses/by-nc-nd/4.0/Luminosity functionObservational cosmologyStar formationStarburst galaxiesSurveysinfo:eu-repo/semantics/article10.3847/2041-8213/ac0a7e1538-4357info:eu-repo/semantics/openAccess