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Rejuvenation in z ∼ 0.8 quiescent galaxies in LEGA-C

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Abstract
We use reconstructed star formation (SF) histories of quiescent galaxies at z = 0.6-1 in the Large Early Galaxy Astrophysics Census survey to identify secondary SF 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 similar to 0.8 quiescent population has experienced such rejuvenation events in the redshift range of 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 similar to 1 Gyr before their secondary SF episode, which lasted similar to 0.7 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 of 2. Overall, rejuvenation events only contribute similar to 2% of the total stellar mass in z similar to 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 similar to 2.
Keywords
DIGITAL SKY SURVEY, RECENT STAR-FORMATION, E+A-GALAXIES, POPULATION, EVOLUTION, UNCERTAINTIES, SPECTROSCOPY, PROPAGATION, ENVIRONMENT, CONNECTION, galaxies: evolution, galaxies: high-redshift, galaxies: star formation

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MLA
Chauke, Priscilla et al. “Rejuvenation in z ∼ 0.8 Quiescent Galaxies in LEGA-C.” ASTROPHYSICAL JOURNAL 877.1 (2019): n. pag. Print.
APA
Chauke, P., van der Wel, A., Pacifici, C., Bezanson, R., Wu, P.-F., Gallazzi, A., Straatman, C., et al. (2019). Rejuvenation in z ∼ 0.8 quiescent galaxies in LEGA-C. ASTROPHYSICAL JOURNAL, 877(1).
Chicago author-date
Chauke, Priscilla, Arjen van der Wel, Camilla Pacifici, Rachel Bezanson, Po-Feng Wu, Anna Gallazzi, Caroline Straatman, et al. 2019. “Rejuvenation in z ∼ 0.8 Quiescent Galaxies in LEGA-C.” Astrophysical Journal 877 (1).
Chicago author-date (all authors)
Chauke, Priscilla, Arjen van der Wel, Camilla Pacifici, Rachel Bezanson, Po-Feng Wu, Anna Gallazzi, Caroline Straatman, Marijn Franx, Ivana Barisic, Eric F Bell, Josha van Houdt, V Maseda, Michael, Adam Muzzin, David Sobral, and Justin Spilker. 2019. “Rejuvenation in z ∼ 0.8 Quiescent Galaxies in LEGA-C.” Astrophysical Journal 877 (1).
Vancouver
1.
Chauke P, van der Wel A, Pacifici C, Bezanson R, Wu P-F, Gallazzi A, et al. Rejuvenation in z ∼ 0.8 quiescent galaxies in LEGA-C. ASTROPHYSICAL JOURNAL. 2019;877(1).
IEEE
[1]
P. Chauke et al., “Rejuvenation in z ∼ 0.8 quiescent galaxies in LEGA-C,” ASTROPHYSICAL JOURNAL, vol. 877, no. 1, 2019.
@article{8620676,
  abstract     = {We use reconstructed star formation (SF) histories of quiescent galaxies at z = 0.6-1 in the Large Early Galaxy Astrophysics Census survey to identify secondary SF 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 similar to 0.8 quiescent population has experienced such rejuvenation events in the redshift range of 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 similar to 1 Gyr before their secondary SF episode, which lasted similar to 0.7 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 of 2. Overall, rejuvenation events only contribute similar to 2% of the total stellar mass in z similar to 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 similar to 2.},
  articleno    = {48},
  author       = {Chauke, Priscilla and van der Wel, Arjen and Pacifici, Camilla and Bezanson, Rachel and Wu, Po-Feng and Gallazzi, Anna and Straatman, Caroline and Franx, Marijn and Barisic, Ivana and Bell, Eric F and van Houdt, Josha and Maseda, Michael, V and Muzzin, Adam and Sobral, David and Spilker, Justin},
  issn         = {0004-637X},
  journal      = {ASTROPHYSICAL JOURNAL},
  keywords     = {DIGITAL SKY SURVEY,RECENT STAR-FORMATION,E+A-GALAXIES,POPULATION,EVOLUTION,UNCERTAINTIES,SPECTROSCOPY,PROPAGATION,ENVIRONMENT,CONNECTION,galaxies: evolution,galaxies: high-redshift,galaxies: star formation},
  language     = {eng},
  number       = {1},
  pages        = {11},
  title        = {Rejuvenation in z ∼ 0.8 quiescent galaxies in LEGA-C},
  url          = {http://dx.doi.org/10.3847/1538-4357/ab164d},
  volume       = {877},
  year         = {2019},
}

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