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 - Funding Information:
This work is based on data and catalog products from Hubble Frontier Fields (HFF)-DeepSpace, funded by the National Science Foundation and Space Telescope Science Institute (operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555).
Funding Information:
Y.W. thanks Shude Mao, Jerry Sellwood, Zuyi Chen, and Xin Wang and for very helpful discussions. We thank the anonymous referee for reading the paper carefully and providing comments that helped improve and strengthen this paper. Z.C., Y.W., X.L., Z.L., M.L., J.L., and S.Z. are supported by the National Key R&D Program of China (grant No. 2018YFA0404503) and the National Science Foundation of China (grant No. 12073014). F.S. acknowledges support from the NRAO Student Observing Support (SOS) award SOSPA7-022. F.S. and E.E. acknowledge funding from JWST/NIRCam contract to the University of Arizona, NAS5-02105. F.E.B. acknowledges support from ANID-Chile BASAL CATA ACE210002 and FB210003, FONDECYT Regular 1200495 and 1190818, and Millennium Science Initiative Program—ICN12_009. F.W. is thankful for support provided by NASA through the NASA Hubble Fellowship grant No. HST-HF2-51448.001-A awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555.
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.
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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 -