CaltechAUTHORS
Published October 20, 2022 | Version public
Journal Article Metadata-only

Early Results from GLASS-JWST. V: The First Rest-frame Optical Size-Luminosity Relation of Galaxies at z > 7

Creators

  • 1. ROR icon Kavli Institute for the Physics and Mathematics of the Universe
  • 2. ROR icon Infrared Processing and Analysis Center
  • 3. ROR icon University of Melbourne
  • 4. ROR icon Centre of Excellence for All-Sky Astrophysics
  • 5. ROR icon National Astronomical Research Institute of Thailand
  • 6. ROR icon Astronomical Observatory of Rome
  • 7. ROR icon University of California, Los Angeles
  • 8. ROR icon Agenzia Spaziale Italiana
  • 9. ROR icon University of Copenhagen
  • 10. ROR icon University of Ljubljana
  • 11. ROR icon University of California, Davis
  • 12. ROR icon Osservatorio Astronomico di Padova
  • 13. ROR icon Tufts University
  • 14. ROR icon Swinburne University of Technology
  • 15. ROR icon Kavli Institute for Particle Astrophysics and Cosmology
  • 16. ROR icon SLAC National Accelerator Laboratory
  • 17. ROR icon Stony Brook University

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 consists of 19 photometrically selected bright galaxies with m_(F444W) ≤ 27.8 at 7 < z < m_(F444W) < 28.2 at z ∼ 9−15. We measure the size of the galaxies in five bands, from rest-frame optical (∼4800 Å) to the UV (∼1600 Å) based on the Sérsic model, and analyse the size–luminosity relation as a function of wavelength. Remarkably, the data quality of the NIRCam imaging is sufficient to probe the half-light radius rₑ down to ∼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 Hubble Space Telescope samples. The median size r₀ at the reference luminosity M = −21 decreases slightly from rest-frame optical (600 ± 80 pc) to UV (450 ± 130 pc). We then refit the size–luminosity relation allowing the slope to vary. The slope is consistent with β ∼ 0.2 for all bands except F150W, where we find a marginally steeper slope of β = 0.53 ± 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.

Additional Information

This work is based on observations made with the NASA/ESA/CSA James Webb Space Telescope. The data were obtained from the Mikulski Archive for Space Telescopes at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-03127 for JWST. These observations are associated with program JWST-ERS-1324. We acknowledge financial support from NASA through grant JWST-ERS-1324. L.Y. acknowledges support by JSPS KAKENHI grant No. JP 21F21325. K.G. and T.N. acknowledge support from Australian Research Council Laureate Fellowship FL180100060. M.B. acknowledges support from the Slovenian national research agency ARRS through grant N1-0238. C.M. acknowledges support by the VILLUM FONDEN under grant 37459. The Cosmic Dawn Center (DAWN) is funded by the Danish National Research Foundation under grant DNRF140.

Additional details

Identifiers

Eprint ID
117640
Resolver ID
CaltechAUTHORS:20221028-653838600.4

Funding

NASA
NAS 5-03127
NASA
JWST-ERS-1324
Japan Society for the Promotion of Science (JSPS)
21F21325
Australian Research Council
FL180100060
ARRS
N1-0238
Villum Foundation
37459
Danish National Research Foundation
DNRF140

Dates

Created
2022-11-08
Created from EPrint's datestamp field
Updated
2022-11-08
Created from EPrint's last_modified field

Caltech Custom Metadata

Caltech groups
Infrared Processing and Analysis Center (IPAC)