TY - JOUR
T1 - Galaxy and Mass Assembly (GAMA)
T2 - Variation in galaxy structure across the green valley
AU - Kelvin, Lee S.
AU - Bremer, Malcolm N.
AU - Phillipps, Steven
AU - James, Philip A.
AU - Davies, Luke J.M.
AU - De Propris, Roberto
AU - Moffett, Amanda J.
AU - Percival, Susan M.
AU - Baldry, Ivan K.
AU - Collins, Chris A.
AU - Alpaslan, Mehmet
AU - Bland-Hawthorn, Joss
AU - Brough, Sarah
AU - Cluver, Michelle
AU - Driver, Simon P.
AU - Hashemizadeh, Abdolhosein
AU - Holwerda, Benne W.
AU - Laine, Jarkko
AU - Lara-Lopez, Maritza A.
AU - Liske, Jochen
AU - Maciejewski, Witold
AU - Napolitano, Nicola R.
AU - Penny, Samantha J.
AU - Popescu, Cristina C.
AU - Sansom, Anne E.
AU - Sutherland, Will
AU - Taylor, Edward N.
AU - van Kampen, Eelco
AU - Wang, Lingyu
PY - 2018/4/14
Y1 - 2018/4/14
N2 - Using a sample of 472 local Universe (z < 0.06) galaxies in the stellar mass range 10.25 < logM*/M⊙ < 10.75, we explore the variation in galaxy structure as a function of morphology and galaxy colour. Our sample of galaxies is subdivided into red, green, and blue colour groups and into elliptical and non-elliptical (disk-type) morphologies. Using Kilo- Degree Survey (KiDS) and Visible and Infrared Survey Telescope for Astronomy (VISTA) Kilo-Degree Infrared Galaxy Survey (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 (2.3s) and lenses (2.9s) in disk-type galaxies as they transition across the green valley. Combined, this implies a joint ring/lens green valley surplus significance of 3.3s relative to equivalent disk-types within either the blue cloud or the red sequence. We recover a bar fraction of ~44 per cent 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 3.0s 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.
AB - Using a sample of 472 local Universe (z < 0.06) galaxies in the stellar mass range 10.25 < logM*/M⊙ < 10.75, we explore the variation in galaxy structure as a function of morphology and galaxy colour. Our sample of galaxies is subdivided into red, green, and blue colour groups and into elliptical and non-elliptical (disk-type) morphologies. Using Kilo- Degree Survey (KiDS) and Visible and Infrared Survey Telescope for Astronomy (VISTA) Kilo-Degree Infrared Galaxy Survey (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 (2.3s) and lenses (2.9s) in disk-type galaxies as they transition across the green valley. Combined, this implies a joint ring/lens green valley surplus significance of 3.3s relative to equivalent disk-types within either the blue cloud or the red sequence. We recover a bar fraction of ~44 per cent 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 3.0s 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.
KW - CD- galaxies: evolution
KW - Galaxies: elliptical and lenticular
KW - Galaxies: spiral
KW - Galaxies: star formation
KW - Galaxies: statistics
KW - Galaxies: structure
UR - http://www.scopus.com/inward/record.url?scp=85047936073&partnerID=8YFLogxK
U2 - 10.1093/mnras/sty933
DO - 10.1093/mnras/sty933
M3 - Article
AN - SCOPUS:85047936073
SN - 0035-8711
VL - 477
SP - 4116
EP - 4130
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 3
ER -