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Massive post-starburst galaxies at z > 1 are compact proto-spheroids

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Almaini_2017_Massive_post_starburst_MNRAS_AAM.pdf (3.321Mb)
Date
01/12/2017
Author
Almaini, Omar
Wild, Vivienne
Maltby, David T.
Hartley, William G.
Simpson, Chris
Hatch, Nina A.
McLure, Ross J.
Dunlop, James S.
Rowlands, Kate
Keywords
Galaxies: evolution
Galaxies: formation
Galaxies: fundamental paramaters
Galaxies: structure
Galaxies: high-redshift
QB Astronomy
QC Physics
3rd-DAS
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Abstract
We investigate the relationship between the quenching of star formation and the structural transformation of massive galaxies, using a large sample of photometrically-selected post-starburst galaxies in the UKIDSS UDS field. We find that post-starburst galaxies at high-redshift (z > 1) show high Sérsic indices, significantly higher than those of active star-forming galaxies, but with a distribution that is indistinguishable from the old quiescent population. We conclude that the morphological transformation occurs before (or during) the quenching of star formation. Recently quenched galaxies are also the most compact; we find evidence that massive post-starburst galaxies (M★ > 1010.5~M⊙) at high redshift (z > 1) are on average smaller than comparable quiescent galaxies at the same epoch. Our findings are consistent with a scenario in which massive passive galaxies are formed from three distinct phases: (1) gas-rich dissipative collapse to very high densities, forming the proto-spheroid; (2) rapid quenching of star formation, to create the “red nugget” with post-starburst features; (3) a gradual growth in size as the population ages, perhaps as a result of minor mergers.
Citation
Almaini , O , Wild , V , Maltby , D T , Hartley , W G , Simpson , C , Hatch , N A , McLure , R J , Dunlop , J S & Rowlands , K 2017 , ' Massive post-starburst galaxies at z > 1 are compact proto-spheroids ' , Monthly Notices of the Royal Astronomical Society , vol. 472 , no. 2 , pp. 1401-1412 . https://doi.org/10.1093/mnras/stx1957
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
DOI
https://doi.org/10.1093/mnras/stx1957
ISSN
0035-8711
Type
Journal article
Rights
© 2017, the Author(s). 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 academic.oup.com/mnras / https://doi.org/10.1093/mnras/stx1957
Collections
  • University of St Andrews Research
URL
http://adsabs.harvard.edu/abs/2017arXiv170800005A
URI
http://hdl.handle.net/10023/11520

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