Rejuvenation in $z\sim 0.8$ quiescent galaxies in LEGA-C

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). $16\pm 3$\% of the $z\sim 0.8$ 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 $\sim 1$Gyr before their secondary SF episode which lasted $\sim 0.7$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 2. Overall, rejuvenation events only contribute $\sim 2$\% of the total stellar mass in $z\sim 0.8$ 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 $z\sim 2$.

14 pages, 8 figures, accepted by ApJ

References in corpus (15)

• Cosmic Star Formation History
• The propagation of uncertainties in stellar population synthesis modeling I: The relevance of uncertain aspects of stellar evolution and the IMF to the derived physical properties of galaxies
• A Highly Consistent Framework for the Evolution of the Star-Forming "Main Sequence" from z~0-6
• The Co-Evolution of Galaxies and Supermassive Black Holes: Insights from Surveys of the Contemporary Universe
• An ultra-deep near-infrared spectrum of a compact quiescent galaxy at z=2.2
• PRIMUS: Constraints on Star Formation Quenching and Galaxy Merging, and the Evolution of the Stellar Mass Function From z=0-1
• The FourStar Galaxy Evolution Survey (ZFOURGE): ultraviolet to far-infrared catalogs, medium-bandwidth photometric redshifts with improved accuracy, stellar masses, and confirmation of quiescent galaxies to z~3.5
• Charting the evolution of the ages and metallicities of massive galaxies since z=0.7
• The role of minor mergers in the recent star formation history of early-type galaxies
• The Assembly Histories of Quiescent Galaxies Since z=0.7 from Absorption Line Spectroscopy
• The UV properties of E+A galaxies: constraints on feedback-driven quenching of star formation
• The VIMOS-VLT Deep Survey. Color bimodality and the mix of galaxy populations up to z~2
• GALEX UV Color Relations for Nearby Early-Type Galaxies
• Post-starburst--AGN Connection: Spatially Resolved Spectroscopy of Hdelta-Strong AGNs
• E+A and Companion Galaxies - I : A Catalogue and Statistics

Cited by in corpus (43)

• Full spectrum fitting with photometry in pPXF: stellar population versus dynamical masses, non-parametric star formation history and metallicity for 3200 LEGA-C galaxies at redshift z~0.8
• Fast, Slow, Early, Late: Quenching Massive Galaxies at z~0.8
• New Observational $H(z)$ Data from Full-Spectrum Fitting of Cosmic Chronometers in the LEGA-C Survey
• Mini-quenching of $z=4-8$ galaxies by bursty star formation
• Ram pressure stripping candidates in the Coma Cluster: Evidence for enhanced star formation
• Coincidence between morphology and star-formation activity through cosmic time: the impact of the bulge growth
• Spectral Energy Distributions in Three Deep-Drilling Fields of the Vera C. Rubin Observatory Legacy Survey of Space and Time: Source Classification and Galaxy Properties
• Reconstructing the Assembly of Massive Galaxies. I: The Importance of the Progenitor Effect in the Observed Properties of Quiescent Galaxies at $z\approx 2$
• Gravitational Potential and Surface Density Drive Stellar Populations -- II. Star-Forming Galaxies
• The Close AGN Reference Survey (CARS): No obvious signature of AGN feedback on star formation, but subtle trends
• A few StePS forward in unveiling the complexity of galaxy evolution: light-weighted stellar ages of intermediate redshift galaxies with WEAVE
• From Carbon to Cobalt: Chemical compositions and ages of $z\sim 0.7$ quiescent galaxies
• Diffstar: A Fully Parametric Physical Model for Galaxy Assembly History
• Molecular Gas Reservoirs in Massive Quiescent Galaxies at $\mathrm{z}\sim 0.7$ Linked to Late Time Star Formation
• Recent Star-formation in a Massive Slowly-Quenched Lensed Quiescent Galaxy at z=1.88
• Across the Green Valley with HST grisms: colour evolution, crossing time-scales and the growth of the red sequence at $z=1.0-1.8$
• Reconstructing the Assembly of Massive Galaxies. II. Galaxies Develop Massive and Dense Stellar Cores as They Evolve and Head Toward Quiescence at Cosmic Noon
• WEAVE-StePS. A stellar population survey using WEAVE at WHT
• Clues on the history of early-type galaxies from SDSS spectra and GALEX photometry
• Ubiquitous [OII] Emission in Quiescent Galaxies at z ~ 0.85
• Morphology & Environment's Role on the Star Formation Rate -- Stellar Mass Relation in COSMOS from 0 < z < 3.5
• The evolution of the gas fraction of quiescent galaxies modeled as a consequence of their creation rate
• ${\mu }_{\star }$ Masses: Weak Lensing Calibration of the Dark Energy Survey Year 1 redMaPPer Clusters using Stellar Masses
• A simple spectroscopic technique to identify rejuvenating galaxies
• COSMOS-Web: A history of galaxy migrations over the stellar mass-star formation rate plane
• A new perspective on the stellar Mass-Metallicity Relation of quiescent galaxies from the LEGA-C survey
• Quantifying the cool ISM in radio AGNs: evidence for late-time re-triggering by galaxy mergers and interactions
• Tracing the evolutionary pathways of dust and cold gas in high-z quiescent galaxies with SIMBA
• The effect of the morphological quenching mechanism on star formation activity at 0.5 < z < 1.5 in 3D-HST/CANDELS
• Evolution of the Sérsic Index up to z=2.5 from JWST and HST
• Die Hard: The On-Off-Cycle of Galaxies on the Star Formation Main Sequence
• The Formation and Evolution of Massive Galaxies
• LeMMINGs. VI. Connecting nuclear activity to bulge properties of active and inactive galaxies: radio scaling relations and galaxy environment
• Feeding the Dead: Neutral Gas Inflow in a Long-Quenched Ancient Massive Galaxy at $z\sim 2.7$ Observed with JWST/NIRSpec
• MASCOT: Molecular gas depletion times and metallicity gradients -- evidence for feedback in quenching active galaxies
• Dust sub-millimetre emission in green valley galaxies
• LEGA-C stellar populations scaling relations. I: Chemo-archaeological downsizing trends at z~0.7
• The LEGA-C galaxy survey: multiple quenching channels for quiescent galaxies at $z\sim 1$
• Reconstructing the Assembly of Massive Galaxies. III: Quiescent Galaxies Loose Angular Momentum as They Evolve in a Mass-dependent Fashion
• The LEGA-C and SAMI Galaxy Surveys: Quiescent Stellar Populations and the Mass-Size Plane across 6 Gyr
• Post-starburst galaxies in the centers of intermediate redshift clusters
• The extension of the Fundamental Metallicity Relation beyond the BPT star-forming sequence: evidence for both gas accretion and starvation
• Lack of influence of the environment in the earliest stages of massive galaxy formation