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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

Published online by Cambridge University Press:  10 June 2020

Y. Tamura
Affiliation:
Department of Physics, Nagoya University, Japan email: ytamura@nagoya-u.jp
K. Mawatari
Affiliation:
Institute for Cosmic Ray Research, The University of Tokyo, Japan
T. Hashimoto
Affiliation:
Department of Environmental Science and Technology, Osaka Sangyo University, Japan National Astronomical Observatory of Japan, Japan
A. K. Inoue
Affiliation:
Department of Environmental Science and Technology, Osaka Sangyo University, Japan
E. Zackrissonm
Affiliation:
Department of Physics and Astronomy, Uppsala University, Sweden
L. Christensen
Affiliation:
Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Denmark
C. Binggeli
Affiliation:
Department of Physics and Astronomy, Uppsala University, Sweden
Y. Matsuda
Affiliation:
National Astronomical Observatory of Japan, Japan
H. Matsuo
Affiliation:
National Astronomical Observatory of Japan, Japan
T. T. Takeuchi
Affiliation:
Department of Physics, Nagoya University, Japan email: ytamura@nagoya-u.jp
R. S. Asano
Affiliation:
Department of Physics, Nagoya University, Japan email: ytamura@nagoya-u.jp
K. Sunaga
Affiliation:
Department of Physics, Nagoya University, Japan email: ytamura@nagoya-u.jp
I. Shimizu
Affiliation:
Department of Earth & Space Science, Osaka University, Japan
T. Okamoto
Affiliation:
Department of Cosmosciences, Hokkaido University, Japan
N. Yoshida
Affiliation:
Department of Physics, The University of Tokyo, Japan Kavli Institute for the Physics and Mathematics of the Universe, The University of Tokyo, Japan
M. Lee
Affiliation:
Department of Physics, Nagoya University, Japan email: ytamura@nagoya-u.jp National Astronomical Observatory of Japan, Japan
T. Shibuya
Affiliation:
Department of Computer Science, Kitami Institute of Technology, Japan
Y. Taniguchi
Affiliation:
The Open University of Japan, Japan
H. Umehata
Affiliation:
RIKEN Cluster for Pioneering Research, Japan
B. Hatsukade
Affiliation:
Institute of Astronomy, The University of Tokyo, Japan
K. Kohno
Affiliation:
Institute of Astronomy, The University of Tokyo, Japan
K. Ota
Affiliation:
Kyoto University Research Administration Office, Japan
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Abstract

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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 ≍ 60Myr−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.

Type
Contributed Papers
Copyright
© International Astronomical Union 2020

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