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Galaxy and Mass Assembly (GAMA) : variation in galaxy structure across the green valley

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Date
07/2018
Author
Kelvin, Lee S.
Bremer, Malcolm N.
Phillipps, Steven
James, Philip A.
Davies, Luke J. M.
Propris, Roberto De
Moffett, Amanda J.
Percival, Susan M.
Baldry, Ivan K.
Collins, Chris A.
Alpaslan, Mehmet
Bland-Hawthorn, Joss
Brough, Sarah
Cluver, Michelle
Driver, Simon P.
Hashemizadeh, Abdolhosein
Holwerda, Benne W.
Laine, Jarkko
Lara-Lopez, Maritza A.
Liske, Jochen
Maciejewski, Witold
Napolitano, Nicola R.
Penny, Samantha J.
Popescu, Cristina C.
Sansom, Anne E.
Sutherland, Will
Taylor, Edward N.
Kampen, Eelco van
Wang, Lingyu
Keywords
Galaxies: elliptical and lenticular, cD
Galaxies: spiral
Galaxies: evolution
Galaxies: star formation
Galaxies: statistics
Galaxies: structure
QB Astronomy
QC Physics
3rd-DAS
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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*/Mʘ < 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(2.3σ) and lenses (2.9σ) in disk-type galaxies as they transition across the green valley. Combined, this implies a joint ring/lens green valley surplus significance of 3.3σ 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 3.0σ 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.
Citation
Kelvin , L S , Bremer , M N , Phillipps , S , James , P A , Davies , L J M , Propris , R D , Moffett , A J , Percival , S M , Baldry , I K , Collins , C A , Alpaslan , M , Bland-Hawthorn , J , Brough , S , Cluver , M , Driver , S P , Hashemizadeh , A , Holwerda , B W , Laine , J , Lara-Lopez , M A , Liske , J , Maciejewski , W , Napolitano , N R , Penny , S J , Popescu , C C , Sansom , A E , Sutherland , W , Taylor , E N , Kampen , E V & Wang , L 2018 , ' Galaxy and Mass Assembly (GAMA) : variation in galaxy structure across the green valley ' , Monthly Notices of the Royal Astronomical Society , vol. 477 , no. 3 , pp. 4116-4130 . https://doi.org/10.1093/mnras/sty933
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
DOI
https://doi.org/10.1093/mnras/sty933
ISSN
0035-8711
Type
Journal article
Rights
© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1093/mnras/sty933
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/13246

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