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Journal Article

Galaxy And Mass Assembly (GAMA): M*--Re relations of z=0 bulges, discs and spheroids


Tuffs,  R. J.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Lange, R., Moffett, A. J., Driver, S. P., Robotham, A. S. G., Lagos, C. d. P., Kelvin, L. S., et al. (2016). Galaxy And Mass Assembly (GAMA): M*--Re relations of z=0 bulges, discs and spheroids. Monthly Notices of the Royal Astronomical Society, 462, 1470-1500. doi:10.1093/mnras/stw1495.

Cite as: http://hdl.handle.net/11858/00-001M-0000-002C-0404-2
We perform automated bulge + disc decomposition on a sample of $\sim$7500 galaxies from the Galaxy And Mass Assembly (GAMA) survey in the redshift range of 0.002$<$z$<$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 $\mathcal{M_\star}-R_{\rm e}$ relations. We conclude by comparing our local disc and spheroid $\mathcal{M_\star}-R_{\rm e}$ 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.