ELPIS: Accelerated Metal and Dust Enrichment in a Protocluster Core at z ≈ 8
Artikel i vetenskaplig tidskrift, 2025
We present a study of the metal, dust, and molecular gas content in galaxies within the A2744-z7p9OD protocluster at z approximate to 7.88. We focus on two galaxy groups-the Quintet and the Chain-which are covered by the Emission-Line Protocluster Imaging Survey (ELPIS) of the furthest overdensity beyond Pandora's Cluster A2744. [C ii] 158 mu m emission is detected in five galaxies, revealing molecular gas reservoirs with log(Mgas/M circle dot)similar to 9.0 -9.6, while dust continuum at the observed frame of 1.26 mm is detected in three galaxies, yielding dust masses of log(Mdust/M circle dot)similar to 6.0 -6.4, assuming a dust temperature of Tdust=45-15+15 K. The derived properties-including stellar-to-dust mass ratios of log(Mdust/M star)similar to-3 to -2 at log(M star/M circle dot)approximate to 9 and dust-to-gas mass ratios of log(Mdust/Mgas)similar to-4 to -3 at 12+log(O/H)approximate to 8 -place these galaxies in an intermediate regime: higher than the very low ratios expected from supernova-driven dust production but still below the levels attained once efficient grain growth dominates. These values indicate a transition phase of dust mass assembly, likely reflecting the onset of grain growth via metal accretion under accelerated evolution in the protocluster core.
Författare
Hideki Umehata
Nagoya University
Yoichi Tamura
Nagoya University
Yoshinobu Fudamoto
Chiba University
Yurina Nakazato
University of Tokyo
Flatiron Institute
Daniel Ceverino
Universidad Autonoma de Madrid (UAM)
Naoki Yoshida
University of Tokyo
Akio K. Inoue
Waseda University
Ryota Ikeda
National Astronomical Observatory of Japan
The Graduate University for Advanced Studies (SOKENDAI)
Yuma Sugahara
Waseda University
Shutaro Inui
Nagoya University
Santiago Arribas
Consejo Superior de Investigaciones Científicas (CSIC)
Tom Bakx
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
Masato Hagimoto
Nagoya University
Takuya Hashimoto
University of Tsukuba
Luis Colina
Consejo Superior de Investigaciones Científicas (CSIC)
Yi W. Ren
Waseda University
Wataru Osone
University of Tsukuba
Alejandro Crespo Gomez
Space Telescope Science Institute (STScI)
Ken Mawatari
Waseda University
Javier Alvarez-Marquez
Consejo Superior de Investigaciones Científicas (CSIC)
Astrophysical Journal Letters
2041-8205 (ISSN) 2041-8213 (eISSN)
Vol. 993 2 L50Ämneskategorier (SSIF 2025)
Astronomi, astrofysik och kosmologi
DOI
10.3847/2041-8213/ae1603