JWST reveals extended stellar disks for ALMA-bright dusty star-forming galaxies in the Spiderweb protocluster

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Hauptverfasser:	Zhang, Y. H., Dannerbauer, H., Pérez-Martínez, J. M., Koyama, Y., Zheng, X. Z., Calvi, R., Chen, Z., Daikuhara, K., De Breuck, C., D'Eugenio, C., Emonts, B. H. C., Jin, S., Kodama, T., Lehnert, M. D., Nadolny, J., Naufal, A., Pérez-González, P. G.
Format:	Preprint
Veröffentlicht:	2025
Schlagworte:	Astrophysics of Galaxies
Online-Zugang:	Acceder al recurso
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author	Zhang, Y. H. Dannerbauer, H. Pérez-Martínez, J. M. Koyama, Y. Zheng, X. Z. Calvi, R. Chen, Z. Daikuhara, K. De Breuck, C. D'Eugenio, C. Emonts, B. H. C. Jin, S. Kodama, T. Lehnert, M. D. Nadolny, J. Naufal, A. Pérez-González, P. G.
author_facet	Zhang, Y. H. Dannerbauer, H. Pérez-Martínez, J. M. Koyama, Y. Zheng, X. Z. Calvi, R. Chen, Z. Daikuhara, K. De Breuck, C. D'Eugenio, C. Emonts, B. H. C. Jin, S. Kodama, T. Lehnert, M. D. Nadolny, J. Naufal, A. Pérez-González, P. G.
contents	We present JWST/NIRCam imaging of dusty star-forming galaxies (DSFGs) detected by Atacama Large Millimeter/submillimeter Array (ALMA) in the Spiderweb protocluster at $z=2.16$. We identify 22 DSFGs detected by both ALMA and JWST, 10 of which are spectroscopically confirmed as protocluster members. This is the first systematic analysis of a statistical DSFG sample in $z\sim2$ protocluster environments using JWST/NIRCam data. Most of the DSFG members exhibit very red colors and reside in the dusty star-forming region of the rest-frame UVJ diagram, indicating strong dust obscuration. The Gini-M20 diagram suggests that most DSFGs in this protocluster are late-type disks, with a significant fraction displaying clumpy and disturbed rest-frame UV/optical morphologies, but few showing clear merger signatures. The DSFG members exhibit relatively large stellar disks and effective radii with a median stellar mass of log(M/Msun) = 10.8 +/- 0.3, placing them above coeval field DSFGs and typical protocluster galaxies in the size-mass relation at both rest-frame optical and near-infrared wavelengths. These sizes are comparable to those of more evolved field DSFGs at z~1-2, indicating accelerated structural growth in dense environments. Moreover, these DSFG members show a decreasing trend in stellar size from shorter to longer wavelengths, with a moderately steep slope comparable to coeval field DSFGs. These results may support an inside-out growth scenario for protocluster evolution, in which massive galaxies near the center are more evolved and more strongly affected by AGN feedback and environmental effects, e.g., ram-pressure stripping. We propose that the cold gas accretion at the protocluster outskirts drives intense star formation and stellar disk growth in ALMA-detected DSFGs, which are expected to evolve into massive elliptical galaxies at later stages.
format	Preprint
id	arxiv_https___arxiv_org_abs_2512_07050
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	JWST reveals extended stellar disks for ALMA-bright dusty star-forming galaxies in the Spiderweb protocluster Zhang, Y. H. Dannerbauer, H. Pérez-Martínez, J. M. Koyama, Y. Zheng, X. Z. Calvi, R. Chen, Z. Daikuhara, K. De Breuck, C. D'Eugenio, C. Emonts, B. H. C. Jin, S. Kodama, T. Lehnert, M. D. Nadolny, J. Naufal, A. Pérez-González, P. G. Astrophysics of Galaxies We present JWST/NIRCam imaging of dusty star-forming galaxies (DSFGs) detected by Atacama Large Millimeter/submillimeter Array (ALMA) in the Spiderweb protocluster at $z=2.16$. We identify 22 DSFGs detected by both ALMA and JWST, 10 of which are spectroscopically confirmed as protocluster members. This is the first systematic analysis of a statistical DSFG sample in $z\sim2$ protocluster environments using JWST/NIRCam data. Most of the DSFG members exhibit very red colors and reside in the dusty star-forming region of the rest-frame UVJ diagram, indicating strong dust obscuration. The Gini-M20 diagram suggests that most DSFGs in this protocluster are late-type disks, with a significant fraction displaying clumpy and disturbed rest-frame UV/optical morphologies, but few showing clear merger signatures. The DSFG members exhibit relatively large stellar disks and effective radii with a median stellar mass of log(M/Msun) = 10.8 +/- 0.3, placing them above coeval field DSFGs and typical protocluster galaxies in the size-mass relation at both rest-frame optical and near-infrared wavelengths. These sizes are comparable to those of more evolved field DSFGs at z~1-2, indicating accelerated structural growth in dense environments. Moreover, these DSFG members show a decreasing trend in stellar size from shorter to longer wavelengths, with a moderately steep slope comparable to coeval field DSFGs. These results may support an inside-out growth scenario for protocluster evolution, in which massive galaxies near the center are more evolved and more strongly affected by AGN feedback and environmental effects, e.g., ram-pressure stripping. We propose that the cold gas accretion at the protocluster outskirts drives intense star formation and stellar disk growth in ALMA-detected DSFGs, which are expected to evolve into massive elliptical galaxies at later stages.
title	JWST reveals extended stellar disks for ALMA-bright dusty star-forming galaxies in the Spiderweb protocluster
topic	Astrophysics of Galaxies
url	https://arxiv.org/abs/2512.07050