Dust evolution in galaxies at z > 7

Tsutomu T. Takeuchi, Ryosuke S. Asano, Sayaka Nagasaki, Takaya Nozawa, Yoichi Tamura, Ken Mawatari, Akio K. Inoue

Research output: Contribution to journalArticlepeer-review

Abstract

Recently huge amount of dust Mdust ≃ 106-7M in galaxies at z = 7-8 has been discovered by ALMA observations. The suggested timescale of the dust production was a few-several×108 yr, while the stellar mass was several × 109M . This amount of dust cannot be easily explained only by a supply from supernovae if we consider the dust destruction by reverse shocks. We propose that these values can be consistently explained if we take into account the grain growth in the interstellar medium (ISM). This scenario successfully reproduces the evolution of the dust mass, as well as the SFR, and stellar mass simultaneously. We conclude that even at such an early epoch of the Universe, the dust grain growth in the ISM plays a significant role in galaxies.

Original languageEnglish
Pages (from-to)312-313
Number of pages2
JournalProceedings of the International Astronomical Union
Volume15
Issue numberS341
DOIs
Publication statusPublished - 2019
Externally publishedYes

Keywords

  • dust
  • galaxies: evolution
  • galaxies: formation
  • stars: formation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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