Galaxy And Mass Assembly (GAMA): galaxy colour gradients versus colour, structure, and luminosity

Kennedy, Rebecca and Bamford, Steven P. and Häußler, Boris and Brough, Sarah and Holwerda, Benne and Hopkins, Andrew M. and Vika, Marina and Vulcani, Benedetta (2016) Galaxy And Mass Assembly (GAMA): galaxy colour gradients versus colour, structure, and luminosity. Astronomy & Astrophysics, 593 . A84/1-A84/4. ISSN 0004-6361

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Abstract

Using single-component fits to SDSS/UKIDSS images of galaxies in the G09 region of the GAMA survey we study radial colour gradients across the galaxy population. We use the multi-wavelength information provided by MegaMorph analysis of galaxy light profiles to calculate intrinsic colour gradients, and divide into six subsamples split by overall Sérsic index (n) and galaxy colour. We find a bimodality in the colour gradients of high- and low-n galaxies in all wavebands which varies with overall galaxy luminosity. Global trends in colour gradients therefore result from combining the contrasting behaviour of a number of different galaxy populations. The ubiquity of strong negative colour gradients supports the picture of inside-out growth through gas accretion for blue, low-n galaxies, and through dry minor mergers for red, high-n galaxies. An exception is the blue high-n population which has properties indicative of dissipative major mergers.

Item Type: Article
Keywords: galaxies: general ; galaxies: structure ; galaxies: fundamental parameters ; galaxies: formation
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
Identification Number: 10.1051/0004-6361/201628715
Depositing User: Bamford, Steven
Date Deposited: 06 Jan 2017 14:50
Last Modified: 12 Oct 2017 22:02
URI: http://eprints.nottingham.ac.uk/id/eprint/39621

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