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| Paper: |
FIR-Submm Metallicity Diagnostics for High-z Galaxies |
| Volume: |
476, New Trends in Radio Astronomy in the ALMA Era |
| Page: |
29 |
| Authors: |
Nagao, T.; Maiolino, R.; De Breuck, C.; Caselli, P.; Hatsukade, B.; Saigo, K. |
| Abstract: |
The chemical properties of high-z galaxies provide important information for constraining
galaxy evolutionary scenarios. However, optical metallicity diagnostics are unusable for
heavily dust-enshrouded galaxies (such as submillimeter galaxies; SMGs), especially at
z > 3. Here we focus on the flux ratio of [N II] 205μm/[C II] 158μm
to assess the metallicity of high-z SMGs. Through ALMA cycle 0 observations, we have
detected the [N II] 205μm emission in a strongly [C II]-emitting SMG, LESS
J033229.4-275619 at z = 4.76. The velocity-integrated [N II]/[C II] flux ratio is
0.043 ± 0.008, that is consistent to the solar metallicity case. This result implies that
the chemical evolution has progressed very rapidly in this system. |
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