# Galaxy And Mass Assembly (GAMA): M-star-R-e relations of z=0 bulges, discs and spheroids

Lange, R and Moffett, AJ and Driver, SP and Robotham, ASG and Lagos, CDP and Kelvin, LS and Conselice, C and Margalef-Bentabol, B and Alpaslan, M and Baldry, I and Bland-Hawthorn, J and Bremer, M and Brough, S and Cluve, M and Colless, M and Davies, LJM and Häußler, B and Holwerda, BW and Hopkins, AM and Kafle, PR and Kennedy, R and Liske, J and Phillipps, S and Popescu, CC and Taylor, EN and Tuffs, R and Kampen, EV and Wright, AH (2016) Galaxy And Mass Assembly (GAMA): M-star-R-e relations of z=0 bulges, discs and spheroids. Monthly Notices of the Royal Astronomical Society, 462 (2). pp. 1470-1500. ISSN 0035-8711

We perform automated bulge + disc decomposition on a sample of ~7500 galaxies from the Galaxy And Mass Assembly (GAMA) survey in the redshift range of 0.002<z<0.06 using SIGMA, a wrapper around GALFIT3. To achieve robust profile measurements we use a novel approach of repeatedly fitting the galaxies, varying the input parameters to sample a large fraction of the input parameter space. Using this method we reduce the catastrophic failure rate significantly and verify the confidence in the fit independently of \chi^2 Additionally, using the median of the final fitting values and the 16^{th}$and 84^{th} percentile produces more realistic error estimates than those provided by GALFIT, which are known to be underestimated. We use the results of our decompositions to analyse the stellar mass - half-light radius relations of bulges, discs and spheroids. We further investigate the association of components with a parent disc or elliptical relation to provide definite z=0 disc and spheroid M-star-R-e} relations. We conclude by comparing our local disc and spheroid M-star-R-e} to simulated data from EAGLE and high redshift data from CANDELS-UDS. We show the potential of using the mass-size relation to study galaxy evolution in both cases but caution that for a fair comparison all data sets need to be processed and analysed in the same manner. Item Type: Article This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of The Royal Astronomical Society following peer review. The version of record Galaxy And Mass Assembly (GAMA):$\mathcal{M_\star}-R_{\rm e}$relations of$z=0\$ bulges, discs and spheroids is available at: http://dx.doi.org/10.1093/mnras/stw1495 astro-ph.GA; astro-ph.GA; astro-ph.CO Q Science > QB Astronomy Astrophysics Research Institute Oxford University Press Author 15 Jul 2016 09:22 07 Nov 2016 15:55 10.1093/mnras/stw1495 http://researchonline.ljmu.ac.uk/id/eprint/3896