TY - JOUR
T1 - The Identification of a Dusty Multiarm Spiral Galaxy at z = 3.06 with JWST and ALMA
AU - Wu, Yunjing
AU - Cai, Zheng
AU - Sun, Fengwu
AU - Bian, Fuyan
AU - Lin, Xiaojing
AU - Li, Zihao
AU - Li, Mingyu
AU - Bauer, Franz E.
AU - Egami, Eiichi
AU - Fan, Xiaohui
AU - González-López, Jorge
AU - Li, Jianan
AU - Wang, Feige
AU - Yang, Jinyi
AU - Zhang, Shiwu
AU - Zou, Siwei
N1 - Publisher Copyright:
© 2022. The Author(s).
PY - 2023/1/1
Y1 - 2023/1/1
N2 - Spiral arms serve crucial purposes in star formation and galaxy evolution. In this paper, we report the identification of "A2744-DSG-z3,"a dusty, multiarm spiral galaxy at z = 3.059 using the James Webb Space Telescope (JWST) NIRISS imaging and grism spectroscopy. A2744-DSG-z3 was discovered as a gravitationally lensed submillimeter galaxy with the Atacama Large Millimeter/submillimeter Array (ALMA). This is the most distant stellar spiral structure seen thus far, consistent with cosmological simulations that suggest z ≈ 3 as the epoch when spirals emerge. Thanks to the gravitational lensing and excellent spatial resolution of JWST, the spiral arms are resolved with a spatial resolution of ≈290 pc. Based on spectral energy distribution fitting, the spiral galaxy has a delensed star formation rate of 85 ± 30Me yr-1, and a stellar mass of ≈1010.6Me, indicating that A2744-DSG-z3 is a mainsequence galaxy. After fitting the spiral arms, we find a stellar effective radius (Re,star) of 5.0 ± 1.5 kpc. Combining with ALMA measurements, we find that the effective radii ratio between dust and stars is ≈0.4, similar to those of massive star-forming galaxies (SFGs) at z ∼ 2, indicating a compact dusty core in A2744-DSG-z3. Moreover, this galaxy appears to be living in a group environment: including A2744-DSG-z3, at least three galaxies at z = 3.05-3.06 are spectroscopically confirmed by JWST/NIRISS and ALMA, residing within a lensing-corrected projected scale of ≈70 kpc. This, along with the asymmetric brightness profile, further suggests that the spiral arms may be triggered by minor-merger events at z ≳ 3.
AB - Spiral arms serve crucial purposes in star formation and galaxy evolution. In this paper, we report the identification of "A2744-DSG-z3,"a dusty, multiarm spiral galaxy at z = 3.059 using the James Webb Space Telescope (JWST) NIRISS imaging and grism spectroscopy. A2744-DSG-z3 was discovered as a gravitationally lensed submillimeter galaxy with the Atacama Large Millimeter/submillimeter Array (ALMA). This is the most distant stellar spiral structure seen thus far, consistent with cosmological simulations that suggest z ≈ 3 as the epoch when spirals emerge. Thanks to the gravitational lensing and excellent spatial resolution of JWST, the spiral arms are resolved with a spatial resolution of ≈290 pc. Based on spectral energy distribution fitting, the spiral galaxy has a delensed star formation rate of 85 ± 30Me yr-1, and a stellar mass of ≈1010.6Me, indicating that A2744-DSG-z3 is a mainsequence galaxy. After fitting the spiral arms, we find a stellar effective radius (Re,star) of 5.0 ± 1.5 kpc. Combining with ALMA measurements, we find that the effective radii ratio between dust and stars is ≈0.4, similar to those of massive star-forming galaxies (SFGs) at z ∼ 2, indicating a compact dusty core in A2744-DSG-z3. Moreover, this galaxy appears to be living in a group environment: including A2744-DSG-z3, at least three galaxies at z = 3.05-3.06 are spectroscopically confirmed by JWST/NIRISS and ALMA, residing within a lensing-corrected projected scale of ≈70 kpc. This, along with the asymmetric brightness profile, further suggests that the spiral arms may be triggered by minor-merger events at z ≳ 3.
UR - https://www.scopus.com/pages/publications/85148271036
UR - https://www.scopus.com/pages/publications/85148271036#tab=citedBy
U2 - 10.3847/2041-8213/aca652
DO - 10.3847/2041-8213/aca652
M3 - Article
AN - SCOPUS:85148271036
SN - 2041-8205
VL - 942
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
IS - 1
M1 - L1
ER -