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Dust evolution in galaxies at z > 7

Published online by Cambridge University Press:  10 June 2020

Tsutomu T. Takeuchi ,
Ryosuke S. Asano ,
Sayaka Nagasaki ,
Takaya Nozawa ,
Yoichi Tamura ,
Ken Mawatari  and
Akio K. Inoue
Tsutomu T. Takeuchi
Affiliation:
Division of Particle and Astrophysical Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya464-8602, Japan (e-mail: [email protected])
Ryosuke S. Asano
Affiliation:
Division of Particle and Astrophysical Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya464-8602, Japan (e-mail: [email protected])
Sayaka Nagasaki
Affiliation:
Division of Particle and Astrophysical Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya464-8602, Japan (e-mail: [email protected])
Takaya Nozawa
Affiliation:
National Astronomical Observatory of Japan
Yoichi Tamura
Affiliation:
Division of Particle and Astrophysical Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya464-8602, Japan (e-mail: [email protected])
Ken Mawatari
Affiliation:
Institute for Cosmic Ray Research, the University of Tokyo
Akio K. Inoue
Affiliation:
Osaka Sangyo University
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Abstract

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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.

Keywords

galaxies: evolutiongalaxies: formationduststars: formation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S341: Challenges in Panchromatic Modelling with Next Generation Facilities , November 2019 , pp. 312 - 313
Copyright
© International Astronomical Union 2020

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