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Galaxy And Mass Assembly (GAMA): mass-size relations of z < 0.1 galaxies subdivided by Sersic index, colour and morphology

Lange, R and Driver, SP and Robotham, ASG and Kelvin, LS and Graham, AW and Alpaslan, M and Andrews, SK and Baldry, IK and Bamford, S and Bland-Hawthorn, J and Brough, S and Cluver, ME and Conselice, CJ and Davies, LJM and Haeussler, B and Konstantopoulos, IS and Loveday, J and Moffett, AJ and Norberg, P and Phillipps, S and Taylor, EN and Lopez-Sanchez, AR and Wilkins, SM (2015) Galaxy And Mass Assembly (GAMA): mass-size relations of z < 0.1 galaxies subdivided by Sersic index, colour and morphology. Monthly Notices of the Royal Astronomical Society, 447 (3). pp. 2603-2630. ISSN 0035-8711

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Abstract

We use data from the Galaxy And Mass Assembly (GAMA) survey in the redshift range 0.01 < z < 0.1 (8399 galaxies in g to Ks bands) to derive the stellar mass–half-light radius relations for various divisions of ‘early’- and ‘late’-type samples. We find that the choice of division between early and late (i.e. colour, shape, morphology) is not particularly critical; however, the adopted mass limits and sample selections (i.e. the careful rejection of outliers and use of robust fitting methods) are important. In particular, we note that for samples extending to low stellar mass limits (<10 10 M ⊙ ) the Sérsic index bimodality, evident for high-mass systems, becomes less distinct and no-longer acts as a reliable separator of early- and late-type systems. The final set of stellar mass–half-light radius relations are reported for a variety of galaxy population subsets in 10 bands (ugrizZY JHKs) and are intended to provide a comprehensive low-z benchmark for the many ongoing high-z studies. Exploring the variation of the stellar mass–half-light radius relations with wavelength, we confirm earlier findings that galaxies appear more compact at longer wavelengths albeit at a smaller level than previously noted: at 10 10 M ⊙ both spiral systems and ellipticals show a decrease in size of 13 per cent from g to Ks (which is near linear in log wavelength). Finally, we note that the sizes used in this work are derived from 2D Sérsic light profile fitting (using galfit3), i.e. elliptical semimajor half-light radii, improving on earlier low-z benchmarks based on circular apertures.

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 MNRAS (March 1, 2015) 447 (3): 2603-2630. is available online at: http://dx.doi.org/10.1093/mnras/stu2467
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
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Date Deposited: 26 Oct 2015 14:56
Last Modified: 26 Oct 2015 14:56
DOI or Identification number: 10.1093/mnras/stu2467
URI: http://researchonline.ljmu.ac.uk/id/eprint/1604

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