Detections of far-infrared [OIII] and dust emission in a galaxy at z = 8.312: Early metal enrichment in the heart of the reionization era

Y. Tamura, K. Mawatari, T. Hashimoto, A. K. Inoue, E. Zackrissonm, L. Christensen, C. Binggeli, Y. Matsuda, H. Matsuo, T. T. Takeuchi, R. S. Asano, K. Sunaga, I. Shimizu, T. Okamoto, N. Yoshida, M. Lee, T. Shibuya, Y. Taniguchi, H. Umehata, B. HatsukadeK. Kohno, K. Ota

研究成果: Article査読

抄録

We present ALMA detection of the [O iii] 88 μm line and 850 μm dust continuum emission in a Y-dropout Lyman break galaxy, MACS0416-Y1. The [O iii] detection confirms the object with a spectroscopic redshift to be z = 8.3118±0.0003. The 850 μm continuum intensity (0.14 mJy) implies a large dust mass on the order of 4×106M . The ultraviolet-to-far infrared spectral energy distribution modeling, where the [O iii] emissivity model is incorporated, suggests the presence of a young (τage 4 Myr), star-forming (SFR 60M yr-1), and moderately metal-polluted (Z 0.2Z ) stellar component with a stellar mass of 3 × 108M . An analytic dust mass evolution model with a single episode of star formation does not reproduce the metallicity and dust mass in 4 Myr, suggesting an underlying evolved stellar component as the origin of the dust mass.

本文言語English
ページ(範囲)211-215
ページ数5
ジャーナルProceedings of the International Astronomical Union
15
S341
DOI
出版ステータスPublished - 2019
外部発表はい

ASJC Scopus subject areas

  • 天文学と天体物理学
  • 宇宙惑星科学

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