Galaxy And Mass Assembly (GAMA): the effect of close interactions on star formation in galaxies

Davies, L. J. M., Robotham, A. S. G., Driver, S. P., Alpaslan, M., Baldry, I. K., Bland-Hawthorn, J., Brough, S., Brown, M. J. I., Cluver, M. E., Drinkwater, M. J., Foster, C., Grootes, M. W., Konstantopoulos, I. S., Lara-Lopez, M. A., Lopez-Sanchez, A. R., Loveday, J., Meyer, M. J., Moffett, A. J., Norberg, P., Owers, M. S., Popescu, C. C., De Propris, R., Sharp, R., Tuffs, R. J., Wang, L., Wilkins, S. M., Dunne, L., Bourne, N. and Smith, M. W. L. (2015) Galaxy And Mass Assembly (GAMA): the effect of close interactions on star formation in galaxies. Monthly Notices of the Royal Astronomical Society, 452 1: 616-636. doi:10.1093/mnras/stv1241


Author Davies, L. J. M.
Robotham, A. S. G.
Driver, S. P.
Alpaslan, M.
Baldry, I. K.
Bland-Hawthorn, J.
Brough, S.
Brown, M. J. I.
Cluver, M. E.
Drinkwater, M. J.
Foster, C.
Grootes, M. W.
Konstantopoulos, I. S.
Lara-Lopez, M. A.
Lopez-Sanchez, A. R.
Loveday, J.
Meyer, M. J.
Moffett, A. J.
Norberg, P.
Owers, M. S.
Popescu, C. C.
De Propris, R.
Sharp, R.
Tuffs, R. J.
Wang, L.
Wilkins, S. M.
Dunne, L.
Bourne, N.
Smith, M. W. L.
Title Galaxy And Mass Assembly (GAMA): the effect of close interactions on star formation in galaxies
Journal name Monthly Notices of the Royal Astronomical Society   Check publisher's open access policy
ISSN 1365-2966
0035-8711
Publication date 2015-09-01
Year available 2015
Sub-type Article (original research)
DOI 10.1093/mnras/stv1241
Open Access Status Not Open Access
Volume 452
Issue 1
Start page 616
End page 636
Total pages 21
Place of publication Oxford, United Kingdom
Publisher Oxford University Press
Collection year 2016
Language eng
Abstract The modification of star formation (SF) in galaxy interactions is a complex process, with SF observed to be both enhanced in major mergers and suppressed in minor pair interactions. Such changes likely to arise on short time-scales and be directly related to the galaxy–galaxy interaction time. Here we investigate the link between dynamical phase and direct measures of SF on different time-scales for pair galaxies, targeting numerous star- formation rate (SFR) indicators and comparing to pair separation, individual galaxy mass and pair mass ratio. We split our sample into the higher (primary) and lower (secondary) mass galaxies in each pair and find that SF is indeed enhanced in all primary galaxies but suppressed in secondaries of minor mergers. We find that changes in SF of primaries are consistent in both major and minor mergers, suggesting that SF in the more massive galaxy is agnostic to pair mass ratio. We also find that SF is enhanced/suppressed more strongly for short-duration SFR indicators (e.g. Hα), highlighting recent changes to SF in these galaxies, which are likely to be induced by the interaction. We propose a scenario where the lower mass galaxy has its SF suppressed by gas heating or stripping, while the higher mass galaxy has its SF enhanced, potentially by tidal gas turbulence and shocks. This is consistent with the seemingly contradictory observations for both SF suppression and enhancement in close pairs.
Keyword Galaxies: evolution
Galaxies: interactions
Galaxies: star formation
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2016 Collection
 
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