TY - JOUR
T1 - Galaxy And Mass Assembly
T2 - the 1.4 GHz SFR indicator, SFR–M* relation and predictions for ASKAP–GAMA
AU - Davies, Luke J M
AU - Huynh, M T
AU - Hopkins, Andrew Mark
AU - Seymour, Nicholas
AU - Driver, Simon P
AU - Robotham, Aaron S G
AU - Baldry, Ivan K
AU - Bland-Hawthorn, Jonathan
AU - Bourne, Nathan
AU - Bremer, Malcolm N
AU - Brown, Michael James Isles
AU - Brough, Sarah
AU - Cluver, Michelle E
AU - Grootes, Meiert W
AU - Jarvis, Matt John
AU - Loveday, Jonathan
AU - Moffett, A
AU - Owers, Matthew S
AU - Phillipps, S
AU - Sadler, E
AU - Wang, L.
AU - Wilkins, S
AU - Wright, Angus
PY - 2017/4
Y1 - 2017/4
N2 - 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.
AB - 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.
KW - radiation mechanisms: non-thermal
KW - galaxies: evolution
KW - galaxies: star formation
KW - radio continuum: galaxies
U2 - 10.1093/mnras/stw3080
DO - 10.1093/mnras/stw3080
M3 - Article
SN - 0035-8711
VL - 466
SP - 2312
EP - 2324
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 2
ER -