Observational and theoretical constraints on the formation and early evolution of the first dust grains in galaxies at 5 < z < 10

D. Burgarella*, A. Nanni, H. Hirashita, P. Theulé, A. K. Inoue, T. T. Takeuchi

*この研究の対応する著者

研究成果: Article査読

14 被引用数 (Scopus)

抄録

Context. The first generation of stars were born a few hundred million years after the big bang. These stars synthesise elements heavier than H and He, which are later expelled into the interstellar medium, initiating the rise of metals. Within this enriched medium, the first dust grains were formed. This event is cosmologically crucial for molecule formation, as dust plays a major role by cooling low-metallicity star-forming clouds, which can fragment to create lower mass stars. Collecting information on these first dust grains is difficult because of the negative alliance of large distances and low dust masses. Aims. We aim to combine the observational information from galaxies at redshifts 5 z 10 to constrain their dust emission and theoretically understand the first evolutionary phases of the dust cycle. Methods. Spectral energy distributions (SEDs) are fitted with CIGALE and the physical parameters and their evolution are modelled. From this SED fitting, we built a dust-emission template for this population of galaxies in the reionisation epoch. Results. Our new models explain why some early galaxies are observed and others are not. We follow in time the formation of the first grains by supernovae later destroyed by other supernova blasts and expelled in the circumgalactic and intergalactic media. Conclusions. We find evidence for the first dust grains formed in the universe. But above all, this work underlines the need to collect more data and to develop new facilities to further constrain the dust cycle in galaxies in the reionisation epoch.

本文言語English
論文番号A32
ジャーナルAstronomy and Astrophysics
637
DOI
出版ステータスPublished - 2020 5月 1

ASJC Scopus subject areas

  • 天文学と天体物理学
  • 宇宙惑星科学

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