A Spectroscopic Study of a Rich Cluster at z = 1.52 with Subaru and LBT: The Environmental Impacts on the Mass-Metallicity Relation

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

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

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.

Original languageEnglish
Article number118
JournalAstrophysical Journal
Volume877
Issue number2
DOIs
Publication statusPublished - 2019 Jun 1

Keywords

  • galaxies: ISM
  • galaxies: clusters: individual (4C65.22)
  • galaxies: evolution
  • techniques: imaging spectroscopy

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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