2026-01-06 カリフォルニア工科大学（Caltech）
The 18 galaxies from the ALPINE-CRISTAL-JWST survey. Each picture shows the location of ionized gas (as traced by the hydrogen alpha line, the spectral signature of hot hydrogen gas) in the galaxies. Several of the pictured galaxies are interacting, meaning two or even three galaxies are in the process of merging.Credit: Andreas Faisst (Caltech) and the ALPINE-CRISTAL-JWST Survey team
＜関連情報＞
- https://www.caltech.edu/about/news/young-galaxies-grow-up-fast
- https://iopscience.iop.org/article/10.3847/1538-4365/ae0928
ALPINE-CRISTAL-JWSTサーベイ：Z = 4～6における18個の主系列銀河のJWST/IFU光学観測 The ALPINE-CRISTAL-JWST Survey: JWST/IFU Optical Observations for 18 Main-sequence Galaxies at z = 4–6
A. L. Faisst, S. Fujimoto, A. Tsujita, W. Wang, N. Nezhad, F. Loiacono, H. Übler, M. Béthermin, P. Cassata, M. Dessauges-Zavadsky,…
The Astrophysical Journal Supplement Published: 2026 January 6
DOI:10.3847/1538-4365/ae0928
Abstract
To fully characterize the formation and evolution of galaxies, we need to observe their stars, gas, and dust on resolved spatial scales. We present the ALPINE-CRISTAL-JWST survey, which combines kiloparsec-resolved imaging and spectroscopy from the Hubble Space Telescope, JWST, and Atacama Large Millimeter/submillimeter Array for 18 representative main-sequence galaxies at z = 4–6 and log(M*/M⦿)＞9.5 to study their star formation, chemical properties, and extended gas reservoirs. The cospatial measurements resolving the ionized gas, molecular gas, stars, and dust on 1–2 kpc scales make this a unique benchmark sample for the study of galaxy formation and evolution at z ∼ 5, connecting the Epoch of Reionization with the cosmic noon. In this paper, we outline the survey goals and sample selection, and present a summary of the available data for the 18 galaxies. In addition, we measure spatially integrated quantities (such as global gas metallicity), test different star formation rate indicators, and quantify the presence of Hα halos. Our targeted galaxies are relatively metal rich (10%–70% solar), complementary to JWST samples at lower stellar mass, and there is broad agreement between different star formation indicators. One galaxy has the signature of an active galactic nuclei (AGN) based on its emission-line ratios. Six show broad Hα emission suggesting type 1 AGN candidates. We conclude with an outlook on the exciting science that will be pursued with this unique sample in forthcoming papers.
