Galaxy And Mass Assembly GAMA : The Dependence of Star Formation on Surface Brightness in Low Redshift Galaxies

Galaxy And Mass Assembly GAMA : The Dependence of Star Formation on Surface Brightness in Low Redshift Galaxies by S. Phillipps et al. on Tuesday 29 November The star formation rate in galaxies is well known to correlate with stellar mass (the `star-forming main sequence'). Here we extend this further to explore any additional dependence on galaxy surface brightness, a proxy for stellar mass surface density. We use a large sample of low redshift ($z \leq 0.08$) galaxies from the GAMA survey which have both SED derived star formation rates and photometric bulge-disc decompositions, the latter providing measures of disc surface brightness and disc masses. Using two samples, one of galaxies fitted by a single component with S\'{e}rsic index below 2 and one of the discs from two-component fits, we find that once the overall mass dependence of star formation rate is accounted for, there is no evidence in either sample for a further dependence on stellar surface density. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.15998v1