2021A&A...650A..68V

Aims. Our goal is to estimate the star formation main sequence (SFMS) and the star formation rate density (SFRD) at z≤0.017 (d≤75Mpc) using the Javalambre Photometric Local Universe Survey (J-PLUS) first data release, that probes 897.4deg² with twelve optical bands.
Methods. We extract the Hα emission flux of 805 local galaxies from the J-PLUS filter J0660, being the continuum level estimated with the other eleven J-PLUS bands, and the dust attenuation and nitrogen contamination corrected with empirical relations. Stellar masses (M*, Hα luminosities (L_Hα), and star formation rates (SFRs) were estimated by accounting for parameters covariances. Our sample comprises 689 blue galaxies and 67 red galaxies, classified in the (u-g) vs. (g-z) color-color diagram, plus 49 AGN.
Results. The SFMS is explored at logM*≤8 and it is clearly defined by the blue galaxies, with the red galaxies located below them. The SFMS is described as logSFR=0.83logM*-8.44. We find a good agreement with previous estimations of the SFMS, especially those based on integral field spectroscopy. The Hα luminosity function of the AGN-free sample is well described by a Schechter function with logL_Hα^*=41.34, logph^*=-2.43, and α=-1.25. Our measurements provide a lower characteristic luminosity than several previous studies in the literature.
Conclusions. The derived star formation rate density at d≤75Mpc is logρ_SFR=-2.10±0.11, with red galaxies accounting for 15% of the SFRD. Our value is lower than previous estimations at similar redshift, and provides a local reference for evolutionary studies regarding the star formation history of the Universe.