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Evolution of starburst galaxies in the Illustris simulation

Wilkinson, C. L.; Pimbblet, K. A.; Stott, J. P.; Few, C. G.; Gibson, B. K.

Authors

C. L. Wilkinson

J. P. Stott

C. G. Few

Abstract

© 2018 The Author(s). Published by Oxford University Press on behalf of The Royal Astronomical Society. There is a consensus in the literature that starburst galaxies are triggered by interaction events. However, it remains an open question as to what extent both merging and nonmerging interactions have in triggering starbursts. In this study, we make use of the Illustris simulation to test how different triggeringmechanisms can affect starburst events.We examine the star formation rate, colour, and environment of starburst galaxies to determine if this could be why we witness a bimodality in post-starburst populations within observational studies. Further, we briefly test the extent of quenching due to active galactic nuclei feedback. From Illustris, we select 196 starburst galaxies at z = 0.15 and split them into post-merger and pre-merger/harassment-driven starburst samples. We find that 55 % of this sample have not undergone a merger in the past 2 Gyr. Both of our samples are located in low-density environments within the filament regions of the cosmic web; however, we find that premerger/ harassment-driven starbursts are in higher-density environments than post-mergerdriven starbursts. We also find that pre-merger/harassment starbursts are redder than postmerger starbursts; this could be driven by environmental effects. Both, however, produce nuclear starbursts of comparable strengths.

Journal Article Type Article
Publication Date Sep 1, 2018
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press (OUP)
Peer Reviewed Peer Reviewed
Volume 479
Issue 1
Pages 758-767
Institution Citation Wilkinson, C. L., Pimbblet, K. A., Stott, J. P., Few, C. G., & Gibson, B. K. (2018). Evolution of starburst galaxies in the Illustris simulation. Monthly notices, containing papers, abstracts of papers, and reports of the proceedings of the Society, 479(1), 758-767. https://doi.org/10.1093/mnras/sty1493
DOI https://doi.org/10.1093/mnras/sty1493
Publisher URL http://www.research.lancs.ac.uk/portal/en/publications/evolution-of-starburst-galaxies-in-the-illustris-simulation(2928c26a-cd86-4f41-b86b-aef2d0ee4245).html

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Copyright Statement
This article has been accepted for publication in MNRAS ©: 2018 The authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.



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