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24 April 2024 |
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Rejuvenation in $zsim0.8$ quiescent galaxies in LEGA-C | | 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
; | | Date: |
18 May 2019 | | 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). $16pm3$\% of the $zsim0.8$ 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 $sim1$Gyr before their secondary SF episode which
lasted $sim0.7$Gyr. 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 $sim2$\% of the
total stellar mass in $zsim0.8$ 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 $zsim2$. | | Source: | arXiv, 1905.7541 | | Services: | Forum | Review | PDF | Favorites | |
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