The origins of post-starburst galaxies at z < 0.05
Abstract
Post-starburst galaxies can be identified via the presence of prominent Hydrogen Balmer absorption lines in their spectra. We present a comprehensive study of the origin of strong Balmer lines in a volume-limited sample of 189 galaxies with 0.01 < z < 0.05, log (M⋆/M⊙) > 9.5 and projected axis ratio b/a > 0.32. We explore their structural properties, environments, emission lines and star formation histories, and compare them to control samples of star-forming and quiescent galaxies, and simulated galaxy mergers. Excluding contaminants, in which the strong Balmer lines are most likely caused by dust-star geometry, we find evidence for three different pathways through the post-starburst phase, with most events occurring in intermediate-density environments: (1) a significant disruptive event, such as a gas-rich major merger, causing a starburst and growth of a spheroidal component, followed by quenching of the star formation (70% of post-starburst galaxies at 9.5 < log ({M}⋆/{M}⊙) < 10.5 and 60% at log ({M}⋆/{M}⊙) > 10.5); (2) at 9.5 < log ({M}⋆/{M}⊙) < 10.5, stochastic star formation in blue-sequence galaxies, causing a weak burst and subsequent return to the blue sequence (30%); (3) at log ({M}⋆/{M}⊙) > 10.5, cyclic evolution of quiescent galaxies which gradually move towards the high-mass end of the red sequence through weak starbursts, possibly as a result of a merger with a smaller gas-rich companion (40%). Our analysis suggests that active galactic nuclei (AGNs) are ‘on’ for 50% of the duration of the post-starburst phase, meaning that traditional samples of post-starburst galaxies with strict emission line cuts will be at least 50% incomplete due to the exclusion of narrow-line AGNs.
Citation
Pawlik , M M , Taj Aldeen , L , Wild , V , Mendez-Abreu , J , Lahén , N , Johansson , P H , Jimenez , N , Lucas , W , Zheng , Y , Walcher , C J & Rowlands , K 2018 , ' The origins of post-starburst galaxies at z < 0.05 ' , Monthly Notices of the Royal Astronomical Society , vol. 477 , no. 2 . https://doi.org/10.1093/mnras/sty589
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
ISSN
0035-8711Type
Journal article
Description
MMP, VW, JM-A, NJ and KR acknowledge support of the European Research Council via the award of a starting grant (SEDMorph; P.I. V. Wild). LTA acknowledges support from the Iraqi Ministry of Higher Education and Scientific Research. NL acknowledges the support of the Jenny & Antti Wihuri Foundation. NL and PHJ acknowledge the support of the Academy of Finland project 274931. YZ ac- knowledges support of a China Scholarship Council Univer- sity of St Andrews Scholarship. WL acknowledges support from the ECOGAL project, grant agreement 291227, funded by the European Research Council under ERC-2011-ADG.Collections
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