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

Yang, L. and Morishita, T. and Leethochawalit, N. and Castellano, M. and Calabrò, A. and Treu, T. and Bonchi, A. and Fontana, A. and Mason, C. and Merlin, E. and Paris, D. and Trenti, M. and Roberts-Borsani, G. and Bradac, M. and Vanzella, E. and Vulcani, B. and Marchesini, D. and Ding, X. and Nanayakkara, T. and Birrer, S. and Glazebrook, K. and Jones, T. and Boyett, K. and Santini, P. and Strait, V. and Wang, X. (2022) Early Results from GLASS-JWST. V: The First Rest-frame Optical Size-Luminosity Relation of Galaxies at z > 7. Astrophysical Journal Letters, 938 (2). Art. No. L17. ISSN 2041-8205. doi:10.3847/2041-8213/ac8803.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription
Yang, L.0000-0002-8434-880X
Morishita, T.0000-0002-8512-1404
Leethochawalit, N.0000-0003-4570-3159
Castellano, M.0000-0001-9875-8263
Calabrò, A.0000-0003-2536-1614
Treu, T.0000-0002-8460-0390
Bonchi, A.0000-0002-2667-5482
Fontana, A.0000-0003-3820-2823
Mason, C.0000-0002-3407-1785
Merlin, E.0000-0001-6870-8900
Paris, D.0000-0002-7409-8114
Trenti, M.0000-0001-9391-305X
Roberts-Borsani, G.0000-0002-4140-1367
Bradac, M.0000-0001-5984-0395
Vanzella, E.0000-0002-5057-135X
Vulcani, B.0000-0003-0980-1499
Marchesini, D.0000-0001-9002-3502
Ding, X.0000-0001-8917-2148
Nanayakkara, T.0000-0003-2804-0648
Birrer, S.0000-0003-3195-5507
Glazebrook, K.0000-0002-3254-9044
Jones, T.0000-0001-5860-3419
Boyett, K.0000-0003-4109-304X
Santini, P.0000-0002-9334-8705
Strait, V.0000-0002-6338-7295
Wang, X.0000-0002-9373-3865
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.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
NASANAS 5-03127
Japan Society for the Promotion of Science (JSPS)21F21325
Australian Research CouncilFL180100060
Villum Foundation37459
Danish National Research FoundationDNRF140
Issue or Number:2
Record Number:CaltechAUTHORS:20221028-653838600.4
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:117640
Deposited By: Research Services Depository
Deposited On:08 Nov 2022 19:41
Last Modified:08 Nov 2022 19:41

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