Early results from GLASS-JWST. V: the first rest-frame optical size-luminosity relation of galaxies at $z>7$

Abstract

We present the first rest-frame optical size-luminosity relation of galaxies at $z>7$, using the NIRCam imaging data obtained by the GLASS James Webb Space Telescope Early Release Science (GLASS-JWST-ERS) program, providing the deepest extragalactic data of the ERS campaign. Our sample consist of 19 photometrically selected bright galaxies with $m_{\text{F444W}}\le 27.8$ at $7<z<9$ and $m_{\text{F444W}}<28.2$ at $z\sim 9-15$. We measure the size of the galaxies in 5 bands, from the rest-frame optical ($\sim 4800\mathring{\mathrm{A}}$) to the ultra-violet (UV; $\sim 1600\mathring{\mathrm{A}}$) based on the Sérsic model, and analyze the size-luminosity relation as a function of wavelength. Remarkably, the data quality of NIRCam imaging is sufficient to probe the half-light radius $r_e$ down to $\sim 100$ pc at $z>7$. Given the limited sample size and magnitude range, we first fix the slope to that observed for larger samples in rest-frame UV using HST samples. The median size $r_0$ at the reference luminosity $M=-21$ decreases slightly from rest-frame optical ($600\pm 80$ pc) to UV ($450\pm 130$ pc). We then re-fit the size-luminosity relation allowing the slope to vary. The slope is consistent with $\beta \sim 0.2$ for all bands except F150W, where we find a marginally steeper slope of $\beta =0.53\pm 0.15$. The steep UV slope is mainly driven by the smallest and faintest galaxies. If confirmed by larger samples, it implies that the UV size-luminosity relation breaks toward the faint end as suggested by lensing studies.

Accepted by ApJL, 9 pages, 3 figures, 2 tables

References in corpus (11)

• The Near-Infrared Spectrograph (NIRSpec) on the James Webb Space Telescope I. Overview of the instrument and its capabilities
• The Evolution of Galaxy Structure over Cosmic Time
• The GLASS James Webb Space Telescope Early Release Science Program. I. Survey Design and Release Plans
• The Near-Infrared Spectrograph (NIRSpec) on the James Webb Space Telescope II. Multi-object spectroscopy (MOS)
• The mass relations between supermassive black holes and their host galaxies at 1<z<2 with HST-WFC3
• lenstronomy II: A gravitational lensing software ecosystem
• Hyper Suprime-Cam Subaru Strategic Program: A Mass-Dependent Slope of the Galaxy Size-Mass Relation at $z<1$
• Sizes of Lensed Lower-luminosity z=4-8 Galaxies from the Hubble Frontier Field Program
• First Light And Reionisation Epoch Simulations (FLARES) IV: The size evolution of galaxies at $z\ge 5$
• The evolution of the size-mass relation at $z$=1-3 derived from the complete Hubble Frontier Fields data set
• The size-luminosity relation of lensed galaxies at $z=6-9$ in the Hubble Frontier Fields

Cited by in corpus (34)

• CEERS Key Paper I: An Early Look into the First 500 Myr of Galaxy Formation with JWST
• The James Webb Space Telescope Mission
• The brightest galaxies at Cosmic Dawn
• EPOCHS VI: The Size and Shape Evolution of Galaxies since z ~ 8 with JWST Observations
• JWST early Universe observations and ΛCDM cosmology
• Morphologies of Galaxies at $z\gtrsim 9$ Uncovered by JWST/NIRCam Imaging: Cosmic Size Evolution and an Identification of an Extremely Compact Bright Galaxy at $z\sim 12$
• Deep ALMA redshift search of a z~12 GLASS-JWST galaxy candidate
• Physical Characterization of Early Galaxies in the Webb's First Deep Field SMACS J0723.3-7323
• EPOCHS IV: SED Modelling Assumptions and their impact on the Stellar Mass Function at 6.5 < z < 13.5 using PEARLS and public JWST observations
• Expectations of the size evolution of massive galaxies at $3\le z\le 6$ from the TNG50 simulation: the CEERS/JWST view
• JWST/NIRCam Observations of Stars and HII Regions in $z\simeq 6-8$ Galaxies: Properties of Star Forming Complexes on 150 pc Scales
• Peering into cosmic reionization: the Ly$\alpha$ visibility evolution from galaxies at $z$ = 4.5-8.5 with JWST
• Early results from GLASS-JWST. X: Rest-frame UV-optical properties of galaxies at 7 < z < 9
• Early results from GLASS-JWST XVI: Discovering a bluer z~4-7 Universe through UV slopes
• Cosmological Model Tests with JWST
• JWST UNCOVER: The Overabundance of Ultraviolet-luminous Galaxies at $z>9$
• RELICS: Small-scale Star Formation in Lensed Galaxies at $z=6-10$
• The evolution of the SFR and Sigma-SFR of galaxies in cosmic morning (4 < z < 10)
• Early Results From GLASS-JWST. XVII: Building the First Galaxies -- Chapter 1. Star Formation Histories at 5<z < 7
• ALMA Observation of a $z\gtrsim 10$ Galaxy Candidate Discovered with JWST
• Testing CCC+TL Cosmology with Observed BAO Features
• Constraints on the $z\sim 6-13$ intergalactic medium from JWST spectroscopy of Lyman-alpha damping wings in galaxies
• Linking Mg II and [O II] spatial distribution to ionizing photon escape in confirmed LyC leakers and non-leakers
• The GLASS-JWST Early Release Science Program. IV. Data release of 263 spectra from 245 unique sources
• The first GLIMPSE of the faint galaxy population at Cosmic Dawn with JWST: The evolution of the ultraviolet luminosity function across z~9-15
• SHELLQs-JWST Unveils the Host Galaxies of 12 Quasars at z>6
• Tailoring galaxies: size-luminosity-surface brightness relations of bulges and disks along the morphological sequence
• Gravitational lensing modification of the high redshift galaxy luminosity function
• First Light And Reionisation Epoch Simulations (FLARES) XVI: Size Evolution of Massive Dusty Galaxies at Cosmic Dawn from UV to IR
• Assessing the dark matter content of two quasar host galaxies at z~6 through gas kinematics
• JWST reveals extended stellar disks for ALMA-bright dusty star-forming galaxies in the Spiderweb protocluster
• Deeper detection limits in astronomical imaging using self-supervised spatiotemporal denoising
• Dust-UV offsets in high-redshift galaxies in the Cosmic Dawn III simulation
• Evolution of Size, Mass, and Density of Galaxies Since Cosmic Dawn