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  Rejuvenation in z ∼ 0.8 Quiescent Galaxies in LEGA-C

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.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-D19A-1 Version Permalink: https://hdl.handle.net/21.11116/0000-0005-D19B-0
Genre: Journal Article

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https://ui.adsabs.harvard.edu/abs/2019ApJ...877...48C (Any fulltext)
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 Creators:
Chauke, Priscilla1, Author
van der Wel, Arjen1, Author
Pacifici, Camilla1, Author
Bezanson, Rachel1, Author
Wu, Po-Feng1, Author
Gallazzi, Anna1, Author
Straatman, Caroline1, Author
Franx, Marijn1, Author
Barišić, Ivana1, Author
Bell, Eric F.1, Author
van Houdt, Josha1, Author
Maseda, Michael V.1, Author
Muzzin, Adam1, Author
Sobral, David1, Author
Spilker, Justin1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: galaxies: evolution galaxies: high-redshift galaxies: star formation Astrophysics - Astrophysics of Galaxies
 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.

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 Dates: 2019
 Publication Status: Issued
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Title: The Astrophysical Journal
Source Genre: Journal
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Pages: - Volume / Issue: 877 Sequence Number: - Start / End Page: - Identifier: -