Home > Research > Publications & Outputs > Rejuvenation in z~0.8 quiescent galaxies in LEGA-C

Associated organisational unit

Electronic data

  • sfh_legac_rejuv_apj_s2

    Rights statement: This is an author-created, un-copyedited version of an article accepted for publication/published in The Astrophysical Journal. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at doi: 10.3847/1538-4357/ab164d.

    Accepted author manuscript, 2 MB, PDF-document

    Available under license: CC BY-NC: Creative Commons Attribution-NonCommercial 4.0 International License

Links

Text available via DOI:

View graph of relations

Rejuvenation in z~0.8 quiescent galaxies in LEGA-C

Research output: Contribution to journalJournal article

Published
  • Priscilla Chauke
  • Arjen van der Wel
  • Camilla Pacifici
  • Rachel Bezanson
  • Po-Feng Wu
  • Anna Gallazzi
  • Caroline Straatman
  • Marijn Franx
  • Ivana Barišić
  • Eric F. Bell
  • Josha van Houdt
  • Michael V. Maseda
  • Adam Muzzin
  • David Sobral
  • Justin Spilker
Close
Article number48
<mark>Journal publication date</mark>23/05/2019
<mark>Journal</mark>The Astrophysical Journal
Issue number1
Volume877
Number of pages11
Publication statusPublished
Original languageEnglish

Abstract

We use reconstructed star-formation histories (SFHs) of quiescent galaxies at z = 0.6 − 1 in the LEGA-C survey to identify secondary star-formation episodes that, after an initial period of quiescence, moved the galaxies back to the star-forming main sequence (blue cloud). 16 ± 3% of the z ∼ 0.8 quiescent population has experienced such rejuvenation events in the redshift range 0.7 < z < 1.5 after reaching quiescence at some earlier time. On average, these galaxies first became quiescent at z = 1.2, and those that rejuvenated, remained quiescent for ∼ 1Gyr before their secondary SF episode which lasted ∼ 0.7Gyr. The stellar mass attributed to rejuvenation is on average 10% of the galaxy stellar mass, with rare instances of an increase of more than a factor 2. Overall, rejuvenation events only contribute ∼ 2% of the total stellar mass in z ∼ 0.8 quiescent galaxies and we conclude that rejuvenation is not an important evolutionary channel when considering the growth of the red sequence. However, our results complicate the interpretation of galaxy demographics in color space: the galaxies with rejuvenation events tend to lie in the so-called ‘green valley’, yet their progenitors were quiescent at z ∼ 2.

Bibliographic note

This is an author-created, un-copyedited version of an article accepted for publication/published in The Astrophysical Journal. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at doi: 10.3847/1538-4357/ab164d