We present a robust calibration of the 1.4GHz radio continuum star formation rate (SFR) using a combination of the Galaxy And Mass Assembly (GAMA) survey and the Faint Images of the Radio Sky at Twenty-cm (FIRST) survey. We identify individually detected 1.4GHz GAMA-FIRST sources and use a late-type, non-AGN, volume-limited sample from GAMA to produce stellar mass-selected samples. The latter are then combined to produce FIRST-stacked images. This extends the robust parametrisation of the 1.4GHz-SFR relation to faint luminosities. For both the individually detected galaxies and our stacked samples, we compare 1.4GHz luminosity to SFRs derived from GAMA to determine a new 1.4GHz luminosity-to-SFR relation with well constrained slope and normalisation. For the first time, we produce the radio SFR-M* relation over 2 decades in stellar mass, and find that our new calibration is robust, and produces a SFR-M* relation which is consistent with all other GAMA SFR methods. Finally, using our new 1.4GHz luminosity-to-SFR calibration we make predictions for the number of star-forming GAMA sources which are likely to be detected in the upcoming ASKAP surveys, EMU and DINGO.
@article{arxiv.1701.06242,
title = {Galaxy And Mass Assembly: The 1.4GHz SFR indicator, SFR-M* relation and predictions for ASKAP-GAMA},
author = {L. J. M. Davies and M. T. Huynh and A. M. Hopkins and N. Seymour and S. P. Driver and A. G. R. Robotham and I. K. Baldry and J. Bland-Hawthorn and N. Bourne and M. N. Bremer and M. J. I. Brown and S. Brough and M. Cluver and M. W. Grootes and M. Jarvis and J. Loveday and A. Moffet and M. Owers and S. Phillipps and E. Sadler and L. Wang and S. Wilkins and A. Wright},
journal= {arXiv preprint arXiv:1701.06242},
year = {2017}
}