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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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