Rejuvenation in z ∼ 0.8 Quiescent Galaxies in LEGA-C

Chauke, Priscilla; van der Wel, Arjen; Pacifici, Camilla; Bezanson, Rachel; Wu, Po-Feng; Gallazzi, Anna; Straatman, Caroline; Franx, Marijn; Barišić, Ivana; Bell, Eric F.; van Houdt, Josha; Maseda, Michael V.; Muzzin, Adam; Sobral, David; Spilker, Justin

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Rejuvenation in z ∼ 0.8 Quiescent Galaxies in LEGA-C

MPS-Authors

Chauke, Priscilla
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

van der Wel, Arjen
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pacifici, Camilla
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bezanson, Rachel
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Wu, Po-Feng
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Gallazzi, Anna
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Straatman, Caroline
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Franx, Marijn
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Barišić, Ivana
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bell, Eric F.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

van Houdt, Josha
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Maseda, Michael V.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Muzzin, Adam
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Sobral, David
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Spilker, Justin
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

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https://ui.adsabs.harvard.edu/abs/2019ApJ...877...48C
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Citation

Chauke, P., van der Wel, A., Pacifici, C., Bezanson, R., Wu, P.-F., Gallazzi, A., et al. (2019). Rejuvenation in z ∼ 0.8 Quiescent Galaxies in LEGA-C. The Astrophysical Journal, 877.

Cite as: https://hdl.handle.net/21.11116/0000-0005-D19A-1

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 ∼ 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 ∼1 Gyr before their secondary SF episode, which lasted ∼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 ∼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.