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

Lange, R, Moffett, AJ, Driver, SP, Robotham, ASG, Lagos, CDP, Kelvin, LS, Conselice, C, Margalef-Bentabol, B, Alpaslan, M, Baldry, I, Bland-Hawthorn, J, Bremer, M, Brough, S, Cluve, M, Colless, M, Davies, LJM, Häußler, B, Holwerda, BW, Hopkins, AM, Kafle, PR , Kennedy, R, Liske, J, Phillipps, S, Popescu, CC, Taylor, EN, Tuffs, R, 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

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Abstract

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
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 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
Uncontrolled Keywords: astro-ph.GA; astro-ph.GA; astro-ph.CO
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 15 Jul 2016 09:22
Last Modified: 08 Sep 2017 04:15
DOI or Identification number: 10.1093/mnras/stw1495
URI: http://researchonline.ljmu.ac.uk/id/eprint/3896

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