The OTELO survey: the star formation rate evolution of low-mass galaxies
  We present the analysis of a sample of \ha\,, \hb\ and \oii\ emission line
galaxies from the \otelo\ survey, with masses typically below $log(M_*/M_\sun)
\sim 9.4$ and redshifts between $z \sim 0.4$ and 1.43. We study the star
formation rate, star formation rate density, and number density and their
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 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 $z\sim1.4$. 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 star
formation rate density in the redshift range of $0.4<z<1.43$.
