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Galaxy And Mass Assembly: The 1.4GHz SFR indicator, SFR-M* relation and predictions for ASKAP-GAMA

Davies, LJM and Huynh, MT and Hopkins, AM and Seymour, N and Driver, SP and Robotham, AGR and Baldry, IK and Bland-Hawthorn, J and Bourne, N and Bremer, MN and Brown, MJI and Brough, S and Cluver, M and Grootes, MW and Jarvis, M and Loveday, J and Moffet, A and Owers, M and Phillipps, S and Sadler, E and Wang, L and Wilkins, S and Wright, A (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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Abstract

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.

Item Type: Article
Additional Information: This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record MNRAS (2016) 466 (2): 2312-2324 is available online at: http://dx.doi.org/10.1093/mnras/stw3080
Uncontrolled Keywords: astro-ph.GA; astro-ph.GA
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 06 Feb 2017 10:49
Last Modified: 07 Sep 2017 13:17
DOI or Identification number: 10.1093/mnras/stw3080
URI: http://researchonline.ljmu.ac.uk/id/eprint/5440

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