TY - JOUR
T1 - A Multiwavelength Investigation of Spiral Structures in z > 1 Galaxies with JWST
AU - Kalita, Boris S.
AU - Yu, Si-Yue
AU - Silverman, John D.
AU - Daddi, Emanuele
AU - Ho, Luis C.
AU - Faisst, Andreas L.
AU - Dessauges-Zavadsky, Miroslava
AU - Puglisi, Annagrazia
AU - Birrer, Simon
AU - Kashino, Daichi
AU - Ding, Xuheng
AU - Kartaltepe, Jeyhan S.
AU - Liu, Zhaoxuan
AU - Kakkad, Darshan
AU - Valentino, Francesco
AU - Ilbert, Olivier
AU - Magdis, Georgios
AU - Long, Arianna S.
AU - Jin, Shuowen
AU - Koekemoer, Anton M.
AU - Massey, Richard
N1 - © 2025. The Author(s). Published by the American Astronomical Society. This is an open access article distributed under the Creative Commons Attribution License (CC BY), https://creativecommons.org/licenses/by/4.0/
PY - 2025/2/1
Y1 - 2025/2/1
N2 - Recent JWST observations have revealed the prevalence of spiral structures at z > 1. Unlike in the local Universe, the origin and the consequence of spirals at this epoch remain unexplored. We use public JWST/NIRCam data from the COSMOS-Web survey to map spiral structures in eight massive (>1010.5 M⊙) star-forming galaxies at zspec ∼ 1.5. We present a method for systematically quantifying spiral arms at z > 1, enabling direct measurements of flux distributions. Using rest-frame near-IR images, we construct morphological models accurately tracing spiral arms. We detect offsets (∼0.2–0.8 kpc) between the rest-frame optical and near-IR flux distributions across most arms. Drawing parallels to the local Universe, we conclude that these offsets reflect the presence of density waves. For 9 out of 18 arms, the offsets indicate spiral shocks triggered by density waves. In all, 5 arms have offsets in the opposite direction and are likely associated with tidal interactions. For the remaining cases with no detected offsets, we suggest that stochastic “clumpy” star formation is the primary driver of their formation. In conclusion, we find a multifaceted nature of spiral arms at z > 1, similar to that in the local Universe.
AB - Recent JWST observations have revealed the prevalence of spiral structures at z > 1. Unlike in the local Universe, the origin and the consequence of spirals at this epoch remain unexplored. We use public JWST/NIRCam data from the COSMOS-Web survey to map spiral structures in eight massive (>1010.5 M⊙) star-forming galaxies at zspec ∼ 1.5. We present a method for systematically quantifying spiral arms at z > 1, enabling direct measurements of flux distributions. Using rest-frame near-IR images, we construct morphological models accurately tracing spiral arms. We detect offsets (∼0.2–0.8 kpc) between the rest-frame optical and near-IR flux distributions across most arms. Drawing parallels to the local Universe, we conclude that these offsets reflect the presence of density waves. For 9 out of 18 arms, the offsets indicate spiral shocks triggered by density waves. In all, 5 arms have offsets in the opposite direction and are likely associated with tidal interactions. For the remaining cases with no detected offsets, we suggest that stochastic “clumpy” star formation is the primary driver of their formation. In conclusion, we find a multifaceted nature of spiral arms at z > 1, similar to that in the local Universe.
KW - Spiral galaxies
KW - Galaxy evolution
UR - http://www.scopus.com/inward/record.url?scp=85217031038&partnerID=8YFLogxK
U2 - 10.3847/2041-8213/ada958
DO - 10.3847/2041-8213/ada958
M3 - Article
SN - 2041-8205
VL - 979
SP - 1
EP - 10
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
IS - 2
M1 - L44
ER -