Stellar population properties of individual massive early-type galaxies at 1.4 < z < 2

Abstract

We analyse publicly available, individual spectra of four, massive ($M>10^{11}{M}_{\odot }$) early-type galaxies with redshifts in the range 1.4 < z < 2 to determine their stellar content, extending our previous work up to z~2. The wide wavelength range of the VLT/X-Shooter spectroscopic data in the UV-Optical-NIR arms along with the availability of spectro-photometry allows us to explore different techniques to obtain the stellar population properties, namely through age/metallicity sensitive spectral indices, full spectral fitting and broad-band photometric fitting. Moreover, together with the widely used optical Lick indices we consider further indices in the UV rest-frame, and demonstrate that UV indices significantly help the accuracy of the resulting population parameters. We find galaxy ages ranging from 0.2 to 4 Gyr, where the oldest galaxy is found at the lowest redshift, with an excellent agreement between ages determined via indices, full spectral fitting or broad-band colours. These ages are in perfect agreement with ages of local galaxies at the same velocity dispersion when we assume pure passive evolution. Total metallicities derived from indices show some scatter (between less than half-solar to very high values, ([Z/H]~0.6]). We speculate on possible mechanisms explaining these values, but given the sample size and low S/N of the spectra no conclusion can be made. Indices in the UV-rest frame generally lead to similar conclusions as optical indices. For the oldest galaxy (4 Gyr) we show that its UV-indices can only be explained by stellar population models including a UV contribution from old stellar populations, suggesting that old, UV bright populations start to inhabit mature galaxies of a few Gyr of age. This is the highest redshift (z~1.4) detection of the UV-upturn up to date.

arXiv comment23 pages, Accepted for publication in MNRAS

References in corpus (78)

• Stellar population synthesis at the resolution of 2003
• Galactic Stellar and Substellar Initial Mass Function
• The Dust Content and Opacity of Actively Star-Forming Galaxies
• Cosmic Star Formation History
• The UKIRT Infrared Deep Sky Survey (UKIDSS)
• The Baryon Oscillation Spectroscopic Survey of SDSS-III
• Evolutionary population synthesis: models, analysis of the ingredients and application to high-z galaxies
• The epochs of early-type galaxy formation as a function of environment
• MILES: A Medium resolution INT Library of Empirical Spectra
• The ages and metallicities of galaxies in the local universe
• The SAURON project - IV. The mass-to-light ratio, the virial mass estimator and the fundamental plane of elliptical and lenticular galaxies
• An ultra-deep near-infrared spectrum of a compact quiescent galaxy at z=2.2
• Minor mergers and the size evolution of elliptical galaxies
• Detection of quiescent galaxies in a bicolor sequence from z=0-2
• Passively Evolving Early-type Galaxies at 1.4<z<2.5 in the Hubble Ultra Deep Field
• The Stellar Population Histories of Early-Type Galaxies. II. Controlling Parameters of the Stellar Populations
• The Stellar Population Histories of Local Early-Type Galaxies. I. Population Parameters
• Evidence for TP-AGB stars in high redshift galaxies, and their effect on deriving stellar population parameters
• Ages and metallicities of early-type galaxies in the SDSS: new insight into the physical origin of the colour-magnitude and the Mg2-sigmaV relations
• LSD: Lyman-break galaxies Stellar populations and Dynamics. I: Mass, metallicity and gas at z~3.1
• Stellar population models at high spectral resolution
• SDSS IV MaNGA - Spatially resolved diagnostic diagrams: A proof that many galaxies are LIERs
• Environment and self-regulation in galaxy formation
• CANDELS Multiwavelength catalogs: Source Identification and Photometry in the CANDELS UKIDSS Ultra-Deep Survey Field
• On the Origin of [OII] Emission in Red Sequence and Post-starburst Galaxies
• Star formation rates and masses of z ~ 2 galaxies from multicolour photometry
• A massive, quiescent galaxy at redshift of z=3.717
• The COSMOS-WIRCam near-infrared imaging survey: I: BzK selected passive and star forming galaxy candidates at z>1.4
• Recovering galaxy stellar population properties from broad-band spectral energy distribution fitting
• Stellar velocity dispersions and emission line properties of SDSS-III/BOSS galaxies
• Stellar Kinematics of z~2 Galaxies and the Inside-Out Growth of Quiescent Galaxies
• Stellar masses of SDSS-III BOSS galaxies at z~0.5 and constraints to galaxy formation models
• Flux-calibrated stellar population models of Lick absorption-line indices with variable element abundance ratios
• Colors, magnitudes and velocity dispersions in early-type galaxies: Implications for galaxy ages and metallicities
• Firefly (Fitting IteRativEly For Likelihood analYsis): a full spectral fitting code
• Superdense massive galaxies in the Nearby Universe
• Charting the evolution of the ages and metallicities of massive galaxies since z=0.7
• Photo-Chemical Evolution of Elliptical Galaxies I. The high-redshift formation scenario
• Strong Balmer lines in old stellar populations: No need for young ages in ellipticals?
• Deep near-infrared spectroscopy of passively evolving galaxies at z>1.4
• The metallicity of the most distant quasars
• Early-type galaxies at large galactocentric radii - II. Metallicity gradients, and the [Z/H]--mass, [alpha/Fe]--mass relations
• Deep Absorption Line Studies of Quiescent Galaxies at z~2: The Dynamical Mass-Size Relation, and First Constraints on the Fundamental plane
• The Carnegie-Irvine Galaxy Survey. III. The Three-Component Structure of Nearby Elliptical Galaxies
• The Progenitors of the Compact Early-Type Galaxies at High-Redshift
• ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: Molecular gas reservoirs in high-redshift galaxies
• A massive, quiescent, population II galaxy at a redshift of 2.1
• Confirmation of the compactness of a z=1.91 quiescent galaxy with Hubble Space Telescope's Wide Field Camera 3
• Nearby early-type galaxies with ionized gas.IV. Origin and powering mechanism of the ionized gas
• The star formation history of early-type galaxies as a function of mass and environment
• The stellar velocity dispersion of a compact massive galaxy at z=1.80 using X-Shooter: confirmation of the evolution in the mass-size and mass-dispersion relations
• SPIDER VII - Revealing the Stellar Population Content of Massive Early-type Galaxies out to 8Re
• Fundamental metallicity relation in CALIFA, SDSS-IV MaNGA and high-z galaxies
• Timing the formation and assembly of early-type galaxies via spatially resolved stellar populations analysis
• SDSS-IV MaNGA: stellar population gradients as a function of galaxy environment
• The link between the Star Formation History and [alpha/Fe]
• The initial mass function of a massive relic galaxy
• Constraining the time evolution of dark energy, curvature and neutrino properties with cosmic chronometers
• Stellar populations and evolution of early-type cluster galaxies: Constraints from optical imaging and spectroscopy of z=0.5-0.9 galaxy clusters
• Probing recent star formation with absorption-line strengths in hierarchical models and observations
• The origin of the $\alpha$-enhancement of massive galaxies
• SDSS-IV MaNGA: local and global chemical abundance patterns in early-type galaxies
• Extremely Low Molecular Gas Content in a Compact, Quiescent Galaxy at z=1.522
• The early-type galaxies NGC 1407 and NGC 1400 - II: star formation and chemical evolutionary history
• First results from the VIRIAL survey: the stellar content of $UVJ$-selected quiescent galaxies at $1.5<z<2$ from KMOS
• Old age and super-solar metallicity in a massive z~1.4 early-type galaxy from VLT/X-Shooter spectroscopy
• The Star Formation Histories of Red-Sequence Galaxies, Mass-to-Light Ratios and the Fundamental Plane
• Passive galaxies in the early Universe: ALMA confirmation of z~3-5 candidates in the CANDELS GOODS-South field
• Kinematic and chemical evolution of early-type galaxies
• Absorption line indices in the UV. Empirical and theoretical stellar population models
• Empirical calibrations of optical absorption line indices based on the stellar library MILES
• Modelling the UV spectrum of SDSS-III/BOSS galaxies: hints towards the detection of the UV upturn at high-z
• RXJ0848.6+4453: The Evolution of Galaxy Sizes and Stellar Populations in a z=1.27 Cluster
• Spectral detection of multiple stellar populations in z~1 early-type galaxies
• Revisiting the role of the Thermally-Pulsating Asymptotic Giant Branch phase in high-redshift galaxies
• Candidate Massive Galaxies at $z\sim 4$ in the Dark Energy Survey
• UV Upturn in Elliptical Galaxies: Theory
• Probing Star Formation Timescales in Elliptical Galaxies

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• UV upturn versus UV weak galaxies: differences and similarities of their stellar populations unveiled by a de-biased sample
• Evolution of the Ultraviolet Upturn at $0.3<z<1$: exploring helium rich stellar populations
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