Color gradients and half-mass radii of galaxies out to $z=2$ in the CANDELS/3D-HST fields: further evidence for important differences in the evolution of mass-weighted and light-weighted sizes

Abstract

Recent studies have indicated that the ratio between half-mass and half-light radii, $r_{\mathrm{mass}}/r_{\mathrm{light}}$, varies significantly as a function of stellar mass and redshift, complicating the interpretation of the ubiquitous $r_{\mathrm{light}}-M_{\ast }$ relation. To investigate, in this study we construct the light and color profiles of $\sim 3000$ galaxies at $1<z<2$ with $\log M_{\ast }/M_{\odot }>10.25$ using $\text{imcascade}$, a Bayesian implementation of the Multi-Gaussian expansion (MGE) technique. $\text{imcascade}$ flexibly represents galaxy profiles using a series of Gaussians, free of any a-priori parameterization. We find that both star-forming and quiescent galaxies have on average negative color gradients. For star forming galaxies, we find steeper gradients that evolve with redshift and correlate with dust content. Using the color gradients as a proxy for gradients in the $M/L$ ratio we measure half mass radii for our sample of galaxies. There is significant scatter in individual $r_{\mathrm{mass}}/r_{\mathrm{light}}$ ratios, which is correlated with variation in the color gradients. We find that the median $r_{\mathrm{mass}}/r_{\mathrm{light}}$ ratio evolves from 0.75 at $z=2$ to 0.5 at $z=1$, consistent with previous results. We characterize the $r_{\mathrm{mass}}-M_{\ast }$ relation and we find that it has a shallower slope and shows less redshift evolution than the $r_{\mathrm{light}}-M_{\ast }$ relation. This applies both to star-forming and quiescent galaxies. We discuss some of the implications of using $r_{\mathrm{mass}}$ instead of $r_{\mathrm{light}}$, including an investigation of the size-inclination bias and a comparison to numerical simulations.

arXiv commentSubmitted to ApJ: Please find catalog of size and color gradient measurements here: https://raw.githubusercontent.com/tbmiller-astro/tbmiller-astro.github.io/main/assets/Miller2022_morph_CANDELs.txt

References in corpus (88)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• The NumPy array: a structure for efficient numerical computation
• Planck 2015 results. XIII. Cosmological parameters
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
• LSST: from Science Drivers to Reference Design and Anticipated Data Products
• dynesty: A Dynamic Nested Sampling Package for Estimating Bayesian Posteriors and Evidences
• CANDELS: The Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey
• CANDELS: The Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey - The Hubble Space Telescope Observations, Imaging Data Products and Mosaics
• EAZY: A Fast, Public Photometric Redshift Code
• First results from the IllustrisTNG simulations: matter and galaxy clustering
• Stellar mass-to-light ratios and the Tully-Fisher relation
• First results from the IllustrisTNG simulations: the stellar mass content of groups and clusters of galaxies
• First results from the IllustrisTNG simulations: the galaxy color bimodality
• The EAGLE simulations of galaxy formation: calibration of subgrid physics and model variations
• 3D-HST+CANDELS: The Evolution of the Galaxy Size-Mass Distribution since $z=3$
• First results from the IllustrisTNG simulations: A tale of two elements -- chemical evolution of magnesium and europium
• The size distribution of galaxies in the Sloan Digital Sky Survey
• First results from the IllustrisTNG simulations: radio haloes and magnetic fields
• 3D-HST WFC3-selected Photometric Catalogs in the Five CANDELS/3D-HST Fields: Photometry, Photometric Redshifts and Stellar Masses
• The Evolution of the Stellar Mass Functions of Star-Forming and Quiescent Galaxies to z = 4 from the COSMOS/UltraVISTA Survey
• Minor mergers and the size evolution of elliptical galaxies
• Detection of quiescent galaxies in a bicolor sequence from z=0-2
• The Growth of Massive Galaxies Since z=2
• 3D-HST: A wide-field grism spectroscopic survey with the Hubble Space Telescope
• Structural Parameters of Galaxies in CANDELS
• The Relation Between Compact, Quiescent High Redshift Galaxies and Massive Nearby Elliptical Galaxies: Evidence for Hierarchical, Inside-Out Growth
• The size evolution of galaxies since z~3: combining SDSS, GEMS and FIRES
• Efficient Multi-Gaussian Expansion of galaxies
• Second Data Release of the Hyper Suprime-Cam Subaru Strategic Program
• Can Minor Merging Account for the Size Growth of Quiescent Galaxies? New Results from the CANDELS Survey
• The optical morphologies of galaxies in the IllustrisTNG simulation: a comparison to Pan-STARRS observations
• The Size Evolution of High Redshift Galaxies
• Galaxy And Mass Assembly (GAMA): Structural Investigation of Galaxies via Model Analysis (SIGMA)
• Forming Compact Massive Galaxies
• The Size Evolution of Star-forming and Quenched Galaxies in the IllustrisTNG simulation
• A JavaScript Passive Evolution Calculator
• Galaxy And Mass Assembly (GAMA): mass-size relations of z$<$0.1 galaxies subdivided by Sérsic index, colour and morphology
• Newly-quenched galaxies as the cause for the apparent evolution in average size of the population
• The evolving relations between size, mass, surface density, and star formation in 3x10^4 galaxies since z=2
• A CANDELS - 3D-HST Synergy: Resolved Star Formation Patterns at 0.7 < z < 1.5
• Where stars form: inside-out growth and coherent star formation from HST Halpha maps of 2676 galaxies across the main sequence at z~1
• Size evolution of normal and compact galaxies in the EAGLE simulation
• COSMOS-DASH: The Evolution of the Galaxy Size-Mass Relation Since z~3 from new Wide Field WFC3 Imaging Combined with CANDELS/3DHST
• Superdense galaxies and the mass-size relation at low redshift
• Improved Dynamical Constraints on the Masses of the Central Black Holes in Nearby Low-mass Early-type Galactic Nuclei And the First Black Hole Determination for NGC 205
• Evolution of the Sizes of Galaxies over 7<z<12 Revealed by the 2012 Hubble Ultra Deep Field Campaign
• 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
• Optical and Near-Infrared Color Profiles in Nearby Early-Type Galaxies and The Implied Age and Metallicity Gradients
• Spatially-resolved dust maps from Balmer decrements in galaxies at z~1.4
• Colors and color gradients in bulges of galaxies
• Confirmation of the compactness of a z=1.91 quiescent galaxy with Hubble Space Telescope's Wide Field Camera 3
• The stellar mass structure of massive galaxies from z=0 to z=2.5; surface density profiles and half-mass radii
• Spatially Resolved Star Formation and Inside-out Quenching in the TNG50 Simulation and 3D-HST Observations
• A physically motivated definition for the size of galaxies in an era of ultra-deep imaging
• The UVJ Selection of Quiescent and Star Forming Galaxies: Separating Early and Late-Type Galaxies and Isolating Edge-on Spirals
• A mass-dependent slope of the galaxy size-mass relation out to z~3: further evidence for a direct relation between median galaxy size and median halo mass
• Color and Stellar Population Gradients in Passively Evolving Galaxies at z~2 from HST/WFC3 Deep Imaging in the Hubble Ultra Deep Field
• Modelling the spectral energy distribution of galaxies. IV Correcting apparent disk scalelengths and central surface brightnesses for the effect of dust at optical and near-infrared wavelengths
• GOODS-ALMA 2.0: Source catalog, number counts, and prevailing compact sizes in 1.1 mm galaxies
• Hyper Suprime-Cam Subaru Strategic Program: A Mass-Dependent Slope of the Galaxy Size-Mass Relation at $z<1$
• Beyond UVJ: More Efficient Selection of Quiescent Galaxies With UV / Mid-IR Fluxes
• Structural evolution in massive galaxies at z~2
• Rest-frame near-infrared sizes of galaxies at cosmic noon: objects in JWST's mirror are smaller than they appeared
• Half-mass radii of quiescent and star-forming galaxies evolve slowly from 0 < z < 2.5: implications for galaxy assembly histories
• The Stellar Initial Mass Function in Early-Type Galaxies From Absorption Line Spectroscopy. IV. A Super-Salpeter IMF in the center of NGC 1407 from Non-Parametric Models
• The relationship between fine galaxy stellar morphology and star formation activity in cosmological simulations: a deep learning view
• The Origin of Color Gradients in Early-Type Systems and Their Compactness at High-z
• Dissecting the size-mass and ${\Sigma }_1$-mass relations at 1.0 < z < 2.5: galaxy mass profiles and color gradients as a function of spectral shape
• Size evolution of star-forming galaxies with $2<z<4.5$ in the VIMOS Ultra-Deep Survey
• Sizes, Colour gradients and Resolved Stellar Mass Distributions for the Massive Cluster Galaxies in XMMUJ2235-2557 at z = 1.39
• UVI colour gradients of 0.4<z<1.4 star-forming main sequence galaxies in CANDELS: dust extinction and star formation profiles
• Stellar mass-to-light ratio gradients in galaxies: correlations with mass
• Galaxy properties as revealed by MaNGA. I. Constraints on Initial Mass Function and M${}_{\ast }$/L gradients in ellipticals
• Galaxy Sizes Since $z=2$ from the Perspective of Stellar Mass Distribution within Galaxies
• Galaxy And Mass Assembly (GAMA): the wavelength dependence of galaxy structure versus redshift and luminosity
• Realistic mock observations of the sizes and stellar mass surface densities of massive galaxies in FIRE-2 zoom-in simulations
• A New View of the Size-Mass Distribution of Galaxies: Using $r_{20}$ and $r_{80}$ instead of $r_{50}$
• The UV-optical Color Gradients in Star-Forming Galaxies at 0.5<z<1.5: Origins and Link to Galaxy Assembly
• Non-parametric Morphologies of Galaxies in the EAGLE Simulation
• The Origins of UV-optical Color Gradients in Star-forming Galaxies at z ~ 2: Predominant Dust Gradients But Negligible sSFR Gradients
• Deprojecting Sersic Profiles for Arbitrary Triaxial Shapes: Robust Measures of Intrinsic and Projected Galaxy Sizes
• Mass-to-Light Ratios of Spatially Resolved Stellar Populations in M31
• The half mass radius of MaNGA galaxies: Effect of IMF gradients
• The differences between mass- and light-derived structural parameters over time for MaNGA Elliptical galaxies
• Bayesian fitting of multi-Gaussian expansion models to galaxy images
• Variation in the stellar initial mass function from the chromospheric activity of M dwarfs in early-type galaxies
• Anomalously Narrow Linewidths of Compact Massive Star-Forming Galaxies at z~2.3: A Possible Inclination Bias in the Size-Mass Plane

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• JWST CEERS probes the role of stellar mass and morphology in obscuring galaxies
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• CEERS: MIRI deciphers the spatial distribution of dust-obscured star formation in galaxies at $0.1<z<2.5$
• Rest-Frame Near-Infrared Radial Light Profiles up to z=3 from JWST/NIRCam: Wavelength Dependence of the Sérsic Index
• JWST's PEARLS: resolved study of the stellar and dust components in starburst galaxies at cosmic noon
• The evolution of radial gradients of MaNGA quiescent elliptical galaxies: inside-out quenching or outer mass growth?
• JADES: Rest-frame UV-to-NIR Size Evolution of Massive Quiescent Galaxies from Redshift z=5 to z=0.5
• Age and metal gradients in massive quiescent galaxies at $0.6\lesssim z\lesssim 1.0$: implications for quenching and assembly histories
• JADES Ultra-red Flattened Objects: Morphologies and Spatial Gradients in Color and Stellar Populations
• Ages and metallicities of quiescent galaxies: confronting broadband ($UVJ$) colours with stellar absorption lines
• DESI Massive Post-Starburst Galaxies at $\mathbf{z}\sim 1.2$ have compact structures and dense cores
• JWST Reveals Bulge-dominated Star-forming Galaxies at Cosmic Noon
• Evolution of massive quiescent galaxies via envelope accretion
• Self-Similar Buildup and Inside-Out Growth: Tracing the Evolution of Intermediate to High-Mass Star-Forming Galaxies Since $z=2$
• The link between galaxy structure properties and star formation in local galaxies
• An X-ray-Emitting Proto-Cluster at $z\approx 5.7$ Reveals Rapid Structure Growth
• SE3D: Building a radiative transfer emulator to fit panchromatic resolved galaxy observations with 3D models of dust and stars