Kelvin, LS, Bremer, MN, Phillipps, S, James, PA, Davies, LJM, Propris, RD, Moffett, AJ, Percival, SM, Baldry, IK, Collins, CA, Alpaslan, M, Bland-Hawthorn, J, Brough, S, Cluver, M, Driver, SP, Hashemizadeh, A, Holwerda, BW, Laine, J, Lara-Lopez, MA, Liske, J et al, Maciejewski, W, Napolitano, NR, Penny, SJ, Popescu, CC, Sansom, AE, Sutherland, W, Taylor, EN, Kampen, EV and Wang, L (2018) Galaxy and Mass Assembly (GAMA): Variation in Galaxy Structure Across the Green Valley. Monthly Notices of the Royal Astronomical Society. ISSN 0035-8711

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Abstract

Using a sample of 472 local Universe (z<0.06) galaxies in the stellar mass range 10.25 < log M*/M_sun < 10.75, we explore the variation in galaxy structure as a function of morphology and galaxy colour. Our sample of galaxies is sub-divided into red, green and blue colour groups and into elliptical and non-elliptical (disk-type) morphologies. Using KiDS and VIKING derived postage stamp images, a group of eight volunteers visually classified bars, rings, morphological lenses, tidal streams, shells and signs of merger activity for all systems. We find a significant surplus of rings ($2.3\sigma$) and lenses ($2.9\sigma$) in disk-type galaxies as they transition across the green valley. Combined, this implies a joint ring/lens green valley surplus significance of $3.3\sigma$ relative to equivalent disk-types within either the blue cloud or the red sequence. We recover a bar fraction of ~44% which remains flat with colour, however, we find that the presence of a bar acts to modulate the incidence of rings and (to a lesser extent) lenses, with rings in barred disk-type galaxies more common by ~20-30 percentage points relative to their unbarred counterparts, regardless of colour. Additionally, green valley disk-type galaxies with a bar exhibit a significant $3.0\sigma$ surplus of lenses relative to their blue/red analogues. The existence of such structures rules out violent transformative events as the primary end-of-life evolutionary mechanism, with a more passive scenario the favoured candidate for the majority of galaxies rapidly transitioning across the green valley.

Item Type:	Article
Additional Information:	This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords:	astro-ph.GA; astro-ph.GA
Subjects:	Q Science > QB Astronomy Q Science > QC Physics
Divisions:	Astrophysics Research Institute
Publisher:	Oxford University Press
Related URLs:	http://arxiv.org/abs/1804.04470v1
Date Deposited:	18 Apr 2018 09:33
Last Modified:	04 Sep 2021 02:45
DOI or ID number:	10.1093/mnras/sty933
URI:	https://researchonline.ljmu.ac.uk/id/eprint/8507

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