Early Results from GLASS-JWST. XVIII. A First Morphological Atlas of the 1 < z < 5 Universe in the Rest-frame Optical

Early Results from GLASS-JWST. XVIII. A First Morphological Atlas of the 1 < z < 5 Universe in the Rest-frame Optical

Abstract We present a rest-frame optical morphological analysis of galaxies observed with the NIRCam imager on the James Webb Space Telescope (JWST) as part of the GLASS-JWST Early Release Science program. We select 388 sources at redshifts 0.8 < z < 5.4 and use the seven 0.9–5 μ m NIRCam filt...

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Bibliographic Details
Published in:Astrophysical journal. Letters Vol. 948; no. 2; p. L13
Main Authors: Jacobs, C., Glazebrook, K., Calabrò, A., Treu, T., Nannayakkara, T., Jones, T., Merlin, E., Abraham, R., Stevens, A. R. H., Vulcani, B., Yang, L., Bonchi, A., Boyett, K., Bradač, M., Castellano, M., Fontana, A., Marchesini, D., Malkan, M., Mason, C., Morishita, T., Paris, D., Santini, P., Trenti, M., Wang, X.
Format: Journal Article
Language:English
Published: Austin The American Astronomical Society 01-05-2023
IOP Publishing
Subjects:
Asymmetry
Color imagery
Disk galaxies
Galactic bulge
Galaxies
Galaxy classification systems
Galaxy evolution
Hubble Space Telescope
Infrared astronomy
James Webb Space Telescope
Morphology
Red shift
Space telescopes
Stellar mass
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Summary:Abstract We present a rest-frame optical morphological analysis of galaxies observed with the NIRCam imager on the James Webb Space Telescope (JWST) as part of the GLASS-JWST Early Release Science program. We select 388 sources at redshifts 0.8 < z < 5.4 and use the seven 0.9–5 μ m NIRCam filters to generate rest-frame gri composite color images, and conduct visual morphological classification. Compared to Hubble Space Telescope (HST)–based work we find a higher incidence of disks and bulges than expected at z > 1.5, revealed by rest-frame optical imaging. We detect 123 clear disks (58 at z > 1.5) of which 76 have bulges. No evolution of bulge fraction with redshift is evident: 61% at z < 2 ( N = 110) versus 60% at z ≥ 2 ( N = 13). A stellar mass dependence is evident, with bulges visible in 80% of all disk galaxies with mass >10 9.5 M ⊙ ( N = 41) but only 52% at M < 10 9.5 M ⊙ ( N = 82). We supplement visual morphologies with nonparametric measurements of Gini and asymmetry coefficients in the rest-frame i band. Our sources are more asymmetric than local galaxies, with slightly higher Gini values. When compared to high- z rest-frame ultraviolet measurements with HST, JWST shows more regular morphological types such as disks, bulges, and spiral arms at z > 1.5, with smoother (i.e., lower Gini) and more symmetrical light distributions.
Bibliography:Galaxies and Cosmology
AAS41318
ISSN:2041-8205
2041-8213
DOI:10.3847/2041-8213/accd6d