A spectroscopic study of a rich cluster at z = 1.52 with Subaru and LBT: The 
environmental impacts on the mass–metallicity relation

Namiki, Shigeru V.; Koyama, Yusei; Hayashi, Masao; Tadaki, Ken-ichi; Kashikawa, Nobunari; Onodera, Masato; Shimakawa, Rhythm; Kodama, Tadayuki; Tanaka, Ichi; Förster Schreiber, N. M.; Kurk, Jaron; Genzel, R.

doi:10.3847/1538-4357/ab1b6c

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A spectroscopic study of a rich cluster at z = 1.52 with Subaru and LBT: The environmental impacts on the mass–metallicity relation

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Förster Schreiber, N. M.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

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Kurk, Jaron
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

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Genzel, R.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

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Citation

Namiki, S. V., Koyama, Y., Hayashi, M., Tadaki, K.-i., Kashikawa, N., Onodera, M., et al. (2019). A spectroscopic study of a rich cluster at z = 1.52 with Subaru and LBT: The environmental impacts on the mass–metallicity relation. The Astrophysical Journal, 877(2): 118. doi:10.3847/1538-4357/ab1b6c.

Cite as: https://hdl.handle.net/21.11116/0000-0003-D87F-C

Abstract

We present the results of our near-infrared spectroscopic observations of a rich cluster candidate around a radio galaxy at z = 1.52 (4C65.22) with Subaru/MOIRCS and Large binocular telescope/LUCI. We observed 71 galaxies mostly on the star-forming main sequence selected by our previous broadband (photo-z) and narrowband Hα imaging observation in this cluster environment. We successfully confirmed the redshifts of 39 galaxies, and concluded that this is a gravitationally bound, real cluster at z = 1.517. Our spectroscopic data also suggest a hint of large-scale filaments or sheet-like three-dimensional structures crossing at the highest-density cluster core. By stacking the spectra to derive their average interstellar medium gas-phase metallicity based on the [N ii]/Hα emission line flux ratio, we find that the mass–metallicity relation (MZR) in the 4C65.22 cluster environment is consistent with that of Hα-selected field galaxies at similar redshifts. Our results suggest that the environmental impacts on the MZR is small at high redshifts, but a larger sample of high-z clusters and their member galaxies is still required to fully address the effect of environment as well as its cluster–cluster variation.