The OTELO survey: the star formation rate evolution of low-mass galaxies

Abstract

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 $z\sim 1.4$. 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 star formation rate density in the redshift range of $0.4<z<1.43$.

8 pages, 3 figures, accepted for publication in ApJ letters

References in corpus (12)

• The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
• Introducing the Illustris Project: Simulating the coevolution of dark and visible matter in the Universe
• Constraining the Low-Mass Slope of the Star Formation Sequence at 0.5<z<2.5
• An Objective Definition for the Main Sequence of Star-Forming Galaxies
• The Luminosity Function and Star Formation Rate between Redshifts of 0.07 and 1.47 for Narrow-band Emitters in the Subaru Deep Field
• Evolution of the H$\beta$+[OIII] and [OII] luminosity functions and the [OII] star-formation history of the Universe up to $z$ ~ 5 from HiZELS
• Relation Between Stellar Mass and Star Formation Activity in Galaxies
• The OTELO survey. I. Description, data reduction, and multi-wavelength catalogue
• A spectroscopic measure of the star-formation rate density in dwarf galaxies at z~1
• The OTELO survey. II. The faint-end of the H$\alpha$ luminosity function at z $\sim$ 0.40
• Recent stellar mass assembly of low-mass star-forming galaxies at redshifts 0.3 < z < 0.9
• HST Hα grism spectroscopy of ROLES: a flatter low-mass slope for the z~1 SSFR--mass relation

Cited by in corpus (1)

• On the Origins of "Hostless'' Supernovae: Testing the Faint-end Galaxy Luminosity Function and Supernova Progenitors with Events in Dwarf Galaxies