Accelerated Structural Evolution of Galaxies in a Starbursting Cluster at z = 2.51
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Accelerated Structural Evolution of Galaxies in a Starbursting Cluster at z = 2.51. / Xu, Can; Wang, Tao; Gu, Qiusheng; Zanella, Anita; Xu, Ke; Sun, Hanwen; Strazzullo, Veronica; Valentino, Francesco; Gobat, Raphael; Daddi, Emanuele; Elbaz, David; Xiao, Mengyuan; Lu, Shiying; Zhou, Luwenjia.
In: Astrophysical Journal Letters, Vol. 951, No. 1, L21, 01.07.2023.Research output: Contribution to journal › Letter › Research › peer-review
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TY - JOUR
T1 - Accelerated Structural Evolution of Galaxies in a Starbursting Cluster at z = 2.51
AU - Xu, Can
AU - Wang, Tao
AU - Gu, Qiusheng
AU - Zanella, Anita
AU - Xu, Ke
AU - Sun, Hanwen
AU - Strazzullo, Veronica
AU - Valentino, Francesco
AU - Gobat, Raphael
AU - Daddi, Emanuele
AU - Elbaz, David
AU - Xiao, Mengyuan
AU - Lu, Shiying
AU - Zhou, Luwenjia
N1 - Publisher Copyright: © 2023. The Author(s). Published by the American Astronomical Society.
PY - 2023/7/1
Y1 - 2023/7/1
N2 - Structural properties of cluster galaxies during their peak formation epoch, z ∼ 2-4 provide key information on whether and how the environment affects galaxy formation and evolution. Based on deep Hubble Space Telescope (HST)/Wide Field Camera 3 (WFC3) imaging toward the z = 2.51 cluster, J1001, we explore environmental effects on the structure, color gradients, and stellar populations of a statistical sample of cluster star-forming galaxies (SFGs). We find that the cluster SFGs are on average smaller than their field counterparts. This difference is most pronounced at the high-mass end (M ⋆ > 1010.5 M ⊙), with nearly all of them lying below the mass-size relation of field galaxies. The high-mass cluster SFGs are also generally old, with a steep negative color gradient, indicating an early formation time likely associated with strong dissipative collapse. For low-mass cluster SFGs, we unveil a population of compact galaxies with steep positive color gradients that are not seen in the field. This suggests that the low-mass compact cluster SFGs may have already experienced strong environmental effects, e.g., tidal/ram pressure stripping, in this young cluster. These results provide evidence on the environmental effects at work in the earliest formed clusters with different roles in the formation of low- and high-mass galaxies.
AB - Structural properties of cluster galaxies during their peak formation epoch, z ∼ 2-4 provide key information on whether and how the environment affects galaxy formation and evolution. Based on deep Hubble Space Telescope (HST)/Wide Field Camera 3 (WFC3) imaging toward the z = 2.51 cluster, J1001, we explore environmental effects on the structure, color gradients, and stellar populations of a statistical sample of cluster star-forming galaxies (SFGs). We find that the cluster SFGs are on average smaller than their field counterparts. This difference is most pronounced at the high-mass end (M ⋆ > 1010.5 M ⊙), with nearly all of them lying below the mass-size relation of field galaxies. The high-mass cluster SFGs are also generally old, with a steep negative color gradient, indicating an early formation time likely associated with strong dissipative collapse. For low-mass cluster SFGs, we unveil a population of compact galaxies with steep positive color gradients that are not seen in the field. This suggests that the low-mass compact cluster SFGs may have already experienced strong environmental effects, e.g., tidal/ram pressure stripping, in this young cluster. These results provide evidence on the environmental effects at work in the earliest formed clusters with different roles in the formation of low- and high-mass galaxies.
U2 - 10.3847/2041-8213/acdb5a
DO - 10.3847/2041-8213/acdb5a
M3 - Letter
AN - SCOPUS:85164943059
VL - 951
JO - The Astrophysical Journal Letters
JF - The Astrophysical Journal Letters
SN - 2041-8205
IS - 1
M1 - L21
ER -
ID: 360816162