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Fast and slow paths to quiescence : ages and sizes of 400 quiescent galaxies from the LEGA-C survey

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Wu_2018_Fast_and_slow_APJ_AAM.pdf (1.568Mb)
Date
19/11/2018
Author
Wu, Po-Feng
van der Wel, Arjen
Bezanson, Rachel
Gallazzi, Anna
Pacifici, Camilla
Straatman, Caroline M. S.
Barišić, Ivana
Bell, Eric F.
Chauke, Priscilla
van Houdt, Josha
Franx, Marijn
Muzzin, Adam
Sobral, David
Wild, Vivienne
Keywords
Galaxies: evolution
Galaxies: formation
Galaxies: high-redshift
Galaxies: stellar content
Galaxies: structure
QB Astronomy
QC Physics
3rd-NDAS
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Abstract
We analyze stellar age indicators (Dn4000 and EW(Hδ)) and sizes of 467 quiescent galaxies with M∗≥1010M⊙ at z∼0.7 drawn from DR2 of the LEGA-C survey. Interpreting index variations in terms of equivalent single stellar population age, we find that the median stellar population is younger for larger galaxies at fixed stellar mass. The effect is significant, yet small; the ages of the larger and the smaller subsets differ by only<500 Myr, much less than the age variation among individual galaxies (∼1.5 Gyr). At the same time, quiescent galaxies with the strongest Hδ absorption —those experienced recent and rapid quenching events — tend to be smaller than the average. These co-existing trends unify seemingly contradictory results in the literature; the complex correlations between size and age indicators revealed by our large sample of galaxies with high-quality spectra suggest that there are multiple evolutionary pathways to quiescence. Regardless of the specific physical mechanisms responsible for the cessation of star formation in massive galaxies, the large scatter in Dn4000 and EW(Hδ) immediately implies that galaxies follow a large variety in evolutionary pathways. On the one hand, we see evidence for a process that slowly shuts off star-formation and transforms star-forming galaxies to quiescent galaxies without necessarily changing their structures. On the other hand, there is likely a mechanism that rapidly quenches galaxies, an event that coincides with dramatic structural changes, producing small post-starburst galaxies.
Citation
Wu , P-F , van der Wel , A , Bezanson , R , Gallazzi , A , Pacifici , C , Straatman , C M S , Barišić , I , Bell , E F , Chauke , P , van Houdt , J , Franx , M , Muzzin , A , Sobral , D & Wild , V 2018 , ' Fast and slow paths to quiescence : ages and sizes of 400 quiescent galaxies from the LEGA-C survey ' , Astrophysical Journal , vol. 868 , no. 1 , 37 . https://doi.org/10.3847/1538-4357/aae822
Publication
Astrophysical Journal
Status
Peer reviewed
DOI
https://doi.org/10.3847/1538-4357/aae822
ISSN
0004-637X
Type
Journal article
Rights
Copyright © 2018, American 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 as such may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.3847/1538-4357/aae822
Description
Funding: VW acknowledges funding from the ERC (starting grant SEDmorph, PI. Wild)
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  • University of St Andrews Research
URL
http://adsabs.harvard.edu/abs/2018arXiv180901211W
URI
http://hdl.handle.net/10023/16017

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