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- Title
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.
- Authors
Tamura, Y.; Mawatari, K.; Hashimoto, T.; Inoue, A. K.; Zackrissonm, E.; Christensen, L.; Binggeli, C.; Matsuda, Y.; Matsuo, H.; Takeuchi, T. T.; Asano, R. S.; Sunaga, K.; Shimizu, I.; Okamoto, T.; Yoshida, N.; Lee, M.; Shibuya, T.; Taniguchi, Y.; Umehata, H.; Hatsukade, B.
- Abstract
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.
- Publication
Proceedings of the International Astronomical Union, 2018, Vol 13, Issue 1S341, p211
- ISSN
1743-9213
- Publication type
Article
- DOI
10.1017/S1743921319002436