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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

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.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-D87F-C Version Permalink: http://hdl.handle.net/21.11116/0000-0003-D880-8
Genre: Journal Article

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Namiki, Shigeru V., Author
Koyama, Yusei, Author
Hayashi, Masao, Author
Tadaki, Ken-ichi, Author
Kashikawa, Nobunari, Author
Onodera, Masato, Author
Shimakawa, Rhythm, Author
Kodama, Tadayuki, Author
Tanaka, Ichi, Author
Förster Schreiber, N. M.1, Author              
Kurk, Jaron1, Author              
Genzel, R.1, Author              
Affiliations:
1Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159889              

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 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.

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 Dates: 2019-06-03
 Publication Status: Published online
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 Identifiers: DOI: 10.3847/1538-4357/ab1b6c
Other: LOCALID: 3072916
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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol, England : IOP Publishing LTD
Pages: - Volume / Issue: 877 (2) Sequence Number: 118 Start / End Page: - Identifier: ISSN: 1538-4357
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3