Panic! at the Disks: First Rest-frame Optical Observations of Galaxy Structure at z > 3 with JWST in the SMACS 0723 Field

We present early results regarding the morphological and structural properties of galaxies seen with the James Webb Space Telescope (JWST) at z > 3 in the Early Release Observations toward the SMACS 0723 cluster field. Using JWST we investigate, for the first time, the optical morphologies of a s...

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Detalles Bibliográficos
Autores: Ferreira, Leonardo, Adams, Nathan, Conselice, Christopher J., Sazonova, Elizaveta, Austin, Duncan, Caruana, Joseph, Ferrari, Fabricio, Verma, Aprajita, Trussler, Jaime, Broadhurst, Thomas, Diego, José, Frye, Brenda L., Pascale, Massimo, Wilkins, Stephen M., Windhorst, Rogier A., Zitrin, Adi
Tipo de recurso: artículo
Fecha de publicación:2022
País:España
Institución:Universidad del País Vasco
Repositorio:Addi. Archivo Digital para la Docencia y la Investigación
OAI Identifier:oai:addi.ehu.eus:10810/58852
Acceso en línea:http://hdl.handle.net/10810/58852
Access Level:acceso abierto
Palabra clave:less than 3
photometric redshifts
stellar populations
space telescope
cluster galaxies
distant galaxies
massive galaxies
Hubble sequence
faint galaxies
deep field
Descripción
Sumario:We present early results regarding the morphological and structural properties of galaxies seen with the James Webb Space Telescope (JWST) at z > 3 in the Early Release Observations toward the SMACS 0723 cluster field. Using JWST we investigate, for the first time, the optical morphologies of a significant number of z > 3 galaxies with accurate photometric redshifts in this field to determine the form of galaxy structure in the relatively early universe. We use visual morphologies and Morfometryka measures to perform quantitative morphology measurements, both parametric with light profile fitting (Sersic indices) and nonparametric (concentration, asymmetry, and smoothness (CAS) values). Using these, we measure the relative fraction of disk, spheroidal, and peculiar galaxies at 3 < z < 8. We discover the surprising result that at z > 1.5 disk galaxies dominate the overall fraction of morphologies, with a factor of similar to 10 relative higher number of disk galaxies than seen by the Hubble Space Telescope at these redshifts. Our visual morphological estimates of galaxies align closely with their locations in CAS parameter space and their Sersic indices.

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