A combined VANDELS and LEGA-C study: the evolution of quiescent galaxy size, stellar mass and age from $\text{z}=0.6$ to $\text{z}=1.3$

Abstract

We study the relationships between stellar mass, size and age within the quiescent population, using two mass-complete spectroscopic samples with $\mathrm{lo}{\mathrm{g}}_{10}(M_{\star }/{\mathrm{M}}_{\odot })>10.3$, taken from VANDELS at $1.0<z<1.3$, and LEGA-C at $0.6<z<0.8$. Using robust D${}_n$4000 values, we demonstrate that the well-known 'downsizing' signature is already in place by $z\simeq 1.1$, with D${}_n$4000 increasing by $\simeq 0.1$ across a $\simeq$ 1 dex mass interval for both VANDELS and LEGA-C. We then proceed to investigate the evolution of the quiescent galaxy stellar mass-size relation from $z\simeq 1.1$ to $z\simeq 0.7$. We find the median size increases by a factor of $1.9\pm 0.1$ at $\mathrm{lo}{\mathrm{g}}_{10}(M_{\star }/{\mathrm{M}}_{\odot })=10.5$, and see tentative evidence for flattening of the relation, finding slopes of $\alpha =0.72\pm 0.06$ and $\alpha =$ $0.56\pm 0.04$ for VANDELS and LEGA-C respectively. We finally split our sample into galaxies above and below our fitted mass-size relations, to investigate how size and D${}_n$4000 correlate. For LEGA-C, we see a clear difference, with larger galaxies found to have smaller D${}_n$4000 at fixed stellar mass. Due to the faintness and smaller numbers of the VANDELS sample, we cannot confirm whether a similar relation exists at $z\simeq 1.1$. We consider whether differences in stellar age or metallicity are most likely to drive this size-D${}_n$4000 relation, finding that any metallicity differences are unlikely to fully explain the observed offset, meaning smaller galaxies must be older than their larger counterparts. We find the observed evolution in size, mass and D${}_n$4000 across the $\simeq 2$ Gyr from $z\sim 1.1$ to $z\sim 0.7$ can be explained by a simple toy model in which VANDELS galaxies evolve passively, whilst experiencing a series of minor mergers.

14 pages, 9 figures, submitted to MNRAS

References in corpus (24)

• The UKIRT Infrared Deep Sky Survey (UKIDSS)
• Mass and environment as drivers of galaxy evolution in SDSS and zCOSMOS and the origin of the Schechter function
• 3D-HST+CANDELS: The Evolution of the Galaxy Size-Mass Distribution since $z=3$
• An ultra-deep near-infrared spectrum of a compact quiescent galaxy at z=2.2
• zCOSMOS: A Large VLT/VIMOS redshift survey covering 0 < z < 3 in the COSMOS field
• Detection of quiescent galaxies in a bicolor sequence from z=0-2
• UltraVISTA: a new ultra-deep near-infrared survey in COSMOS
• Size evolution of the most massive galaxies at 1.7<z<3 from GOODS NICMOS survey imaging
• The Galaxy Mass Function up to z=4 in the GOODS-MUSIC sample: into the epoch of formation of massive galaxies
• Charting the evolution of the ages and metallicities of massive galaxies since z=0.7
• The Cosmic Evolution of Metallicity from the SDSS Fossil Record
• The evolution of star formation histories of quiescent galaxies
• The dependence of Star Formation on Galaxy Stellar Mass
• Fast, Slow, Early, Late: Quenching Massive Galaxies at z~0.8
• Stellar populations from spectroscopy of a large sample of quiescent galaxies at z > 1: Measuring the contribution of progenitor bias to early size growth
• The Assembly Histories of Quiescent Galaxies Since z=0.7 from Absorption Line Spectroscopy
• Half-mass radii for ~7,000 galaxies at 1.0 < z < 2.5: most of the evolution in the mass-size relation is due to color gradients
• Extending the evolution of the stellar mass-size relation at $z\le 2$ to low stellar mass galaxies from HFF and CANDELS
• The VANDELS ESO public spectroscopic survey: final Data Release of 2087 spectra and spectroscopic measurements
• SpectRes: A Fast Spectral Resampling Tool in Python
• Half-mass radii of quiescent and star-forming galaxies evolve slowly from 0 < z < 2.5: implications for galaxy assembly histories
• GMASS Ultradeep Spectroscopy of Galaxies at redshift z~2. I. The stellar metallicity
• Minor vs Major Mergers: The Stellar Mass Growth of Massive Galaxies from z=3 using Number Density Selection Techniques
• Elemental Abundances and Ages of $z\sim 0.7$ Quiescent Galaxies on the Mass-Size Plane: Implication for Chemical Enrichment and Star-Formation Quenching

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• Euclid. I. Overview of the Euclid mission
• 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
• A massive quiescent galaxy at redshift 4.658
• A surprising abundance of massive quiescent galaxies at 3 < z < 5 in the first data from JWST CEERS
• A new measurement of the expansion history of the Universe at z=1.26 with cosmic chronometers in VANDELS
• The stellar metallicities of massive quiescent galaxies at 1.0 < z < 1.3 from KMOS+VANDELS
• The impact of AGN-driven winds on physical and observable galaxy sizes
• Molecular Gas Reservoirs in Massive Quiescent Galaxies at $\mathrm{z}\sim 0.7$ Linked to Late Time Star Formation
• The galaxy mass-size relation in CARLA clusters and proto-clusters at 1.4 < z < 2.8: larger cluster galaxy sizes
• AGN accretion and black hole growth across compact and extended galaxy evolution phases
• The VANDELS ESO public spectroscopic survey: The spectroscopic measurements catalogue
• HectoMAP: The Complete Redshift Survey (Data Release 2)
• PRIMER & JADES reveal an abundance of massive quiescent galaxies at 2 < z < 5
• Size and Spectroscopic Evolution of HectoMAP Quiescent Galaxies
• The connection between stellar mass, age and quenching timescale in massive quiescent galaxies at $z\simeq 1$
• JWST/NIRSpec spectroscopy of intermediate-mass quiescent galaxies at $z\sim 3-4$
• Effects of Environment on the Size Evolution of Quiescent Galaxies: Comparing Galaxies in Clusters and in the Field at Two Rest-frame Wavelengths
• 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 $z\sim 1$
• A SHARP Look at Quenching and Bulge-Disk Growth in Massive Galaxies at Cosmic Noon
• The $10\mathrm{kpc}$ collar of early-type galaxies -- probing evolution by focusing on the inner stellar density profile
• Structural evolution of quiescent galaxies at intermediate redshifts at UV and red rest-frame wavelengths