| Autor: |
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. |
| Zdroj: |
Proceedings of the International Astronomical Union; Nov2018, Vol. 13 Issue 1S341, p211-215, 5p |
| Abstrakt: |
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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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