Galaxy and mass assembly: the 1.4GHz SFR indicator, SFR-M* relation and predictions for ASKAP-GAMA

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, Loveday, J, The GAMA survey, and Unset (2016) Galaxy and mass assembly: the 1.4GHz SFR indicator, SFR-M* relation and predictions for ASKAP-GAMA. Monthly Notices Of The Royal Astronomical Society, 466 (2). pp. 2312-2324. ISSN 0035-8711

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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 1.4 GHz luminosity-to-SFR relation with well constrained slope and normalisation. For the _rst time, we produce the radio SFR-M_ relation over 2 decades in stellar mass, and _nd 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 ASKAP surveys, EMU and DINGO.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Astronomy Centre
Subjects: Q Science > QB Astronomy
Depositing User: Richard Chambers
Date Deposited: 06 Dec 2016 09:58
Last Modified: 31 May 2017 12:24

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