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Davies, L J M; Huynh, M T; Hopkins, A M; Seymour, N; Driver, S P; Robotham, A G R; Baldry, I K; Bland-Hawthorn, J; Bourne, N; Bremer, M N; Brown, M J I; Brough, S; Cluver, M; Grootes, M W; Jarvis, M; Loveday, J; Moffet, A; Owers, M; Phillipps, S; Sadler, E; Wang, L; Wilkins, S; Wright, A
Monthly notices of the Royal Astronomical Society, 04/2017, Volume: 466, Issue: 2Journal Article
We present a robust calibration of the 1.4 GHz 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 1.4 GHz GAMA-FIRST sources and use a late-type, non-active galactic nucleus, 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 parametrization of the 1.4 GHz-SFR relation to faint luminosities. For both the individually detected galaxies and our stacked samples, we compare 1.4 GHz luminosity to SFRs derived from GAMA to determine a new 1.4 GHz luminosity-to-SFR relation with well-constrained slope and normalization. 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 1.4 GHz luminosity-to-SFR calibration we make predictions for the number of star-forming GAMA sources which are likely to be detected in the upcoming Australian Square Kilometre Array Pathfinder surveys, Evolutionary Map of the Universe and Deep Investigation of Neutral Gas Origins.
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