A Tale of two clusters: An analysis of gas-phase metallicity and nebular gas conditions in proto-cluster galaxies at z ∼ 2

Leo Y. Alcorn; Anshu Gupta; Kim-Vy Tran; Glenn G. Kacprzak; Tiantian Yuan; Jonathan Cohn; Ben Forrest; Karl Glazebrook; Anishya Harshan; Lisa J. Kewley; Ivo Labbé; Themiya Nanayakkara; Casey Papovich; Lee R. Spitler; Caroline M. S. Straatman

doi:10.3847/1538-4357/ab3b0c

A Tale of two clusters: An analysis of gas-phase metallicity and nebular gas conditions in proto-cluster galaxies at z ∼ 2

Leo Y. Alcorn^*, Anshu Gupta, Kim-Vy Tran, Glenn G. Kacprzak, Tiantian Yuan, Jonathan Cohn, Ben Forrest, Karl Glazebrook, Anishya Harshan, Lisa J. Kewley, Ivo Labbé, Themiya Nanayakkara, Casey Papovich, Lee R. Spitler, Caroline M. S. Straatman

^*Corresponding author for this work

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Abstract

The ZFIRE survey has spectroscopically confirmed two proto-clusters using the MOSFIRE instrument on Keck I: one at z = 2.095 in COSMOS and another at z = 1.62 in UKIRT Infrared Deep Sky Survey (UDS). Here, we use an updated ZFIRE data set to derive the properties of ionized gas regions of proto-cluster galaxies by extracting fluxes from emission lines Hβ 4861 Å, [O III] 5007 Å, Hα 6563 Å, [N II] 6585 Å, and [S II] 6716,6731 Å. We measure gas-phase metallicity of members in both proto-clusters using two indicators, including a strong-line indicator relatively independent of the ionization parameter and electron density. Proto-cluster and field galaxies in both UDS and COSMOS lie on the same Mass-Metallicity Relation with both metallicity indicators. We compare our results to recent Illustris TNG results, which report no significant gas-phase metallicity offset between protocluster and field galaxies until z = 1.5. This is in agreement with our observed metallicities, where no offset is measured between proto-cluster and field populations. We measure tentative evidence from stacked spectra that indicate UDS high-mass proto-cluster and field galaxies have differing [O III]/Hβ. ratios; however, these results are dependent on the sample size of the high-mass stacks.

Original language	English
Article number	153
Pages (from-to)	1-11
Number of pages	11
Journal	Astrophysical Journal
Volume	883
Issue number	2
DOIs	https://doi.org/10.3847/1538-4357/ab3b0c
Publication status	Published - 1 Oct 2019

Bibliographical note

Copyright 2019 The American Astronomical Society. First published in the Astrophysical Journal, 883(2), 153, 2019, published by IOP Publishing. The original publication is available at http://www.doi.org/10.3847/1538-4357/ab3b0c. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

Keywords

galaxies: clusters: general
galaxies: evolution
galaxies: high-redshift
galaxies: Clusters: General
galaxies: Evolution
galaxies: High-redshift

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10.3847/1538-4357/ab3b0c

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Alcorn, L. Y., Gupta, A., Tran, K.-V., Kacprzak, G. G., Yuan, T., Cohn, J., Forrest, B., Glazebrook, K., Harshan, A., Kewley, L. J., Labbé, I., Nanayakkara, T., Papovich, C., Spitler, L. R., & Straatman, C. M. S. (2019). A Tale of two clusters: An analysis of gas-phase metallicity and nebular gas conditions in proto-cluster galaxies at z ∼ 2. Astrophysical Journal, 883(2), 1-11. Article 153. https://doi.org/10.3847/1538-4357/ab3b0c

@article{7f634199b4344d9fa8f935895bf2288c,

title = "A Tale of two clusters: An analysis of gas-phase metallicity and nebular gas conditions in proto-cluster galaxies at z ∼ 2",

abstract = "The ZFIRE survey has spectroscopically confirmed two proto-clusters using the MOSFIRE instrument on Keck I: one at z = 2.095 in COSMOS and another at z = 1.62 in UKIRT Infrared Deep Sky Survey (UDS). Here, we use an updated ZFIRE data set to derive the properties of ionized gas regions of proto-cluster galaxies by extracting fluxes from emission lines Hβ 4861 {\AA}, [O III] 5007 {\AA}, Hα 6563 {\AA}, [N II] 6585 {\AA}, and [S II] 6716,6731 {\AA}. We measure gas-phase metallicity of members in both proto-clusters using two indicators, including a strong-line indicator relatively independent of the ionization parameter and electron density. Proto-cluster and field galaxies in both UDS and COSMOS lie on the same Mass-Metallicity Relation with both metallicity indicators. We compare our results to recent Illustris TNG results, which report no significant gas-phase metallicity offset between protocluster and field galaxies until z = 1.5. This is in agreement with our observed metallicities, where no offset is measured between proto-cluster and field populations. We measure tentative evidence from stacked spectra that indicate UDS high-mass proto-cluster and field galaxies have differing [O III]/Hβ. ratios; however, these results are dependent on the sample size of the high-mass stacks.",

keywords = "galaxies: clusters: general, galaxies: evolution, galaxies: high-redshift, galaxies: Clusters: General, galaxies: Evolution, galaxies: High-redshift",

author = "Alcorn, {Leo Y.} and Anshu Gupta and Kim-Vy Tran and Kacprzak, {Glenn G.} and Tiantian Yuan and Jonathan Cohn and Ben Forrest and Karl Glazebrook and Anishya Harshan and Kewley, {Lisa J.} and Ivo Labb{\'e} and Themiya Nanayakkara and Casey Papovich and Spitler, {Lee R.} and Straatman, {Caroline M. S.}",

note = "Copyright 2019 The American Astronomical Society. First published in the Astrophysical Journal, 883(2), 153, 2019, published by IOP Publishing. The original publication is available at http://www.doi.org/10.3847/1538-4357/ab3b0c. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.",

year = "2019",

month = oct,

day = "1",

doi = "10.3847/1538-4357/ab3b0c",

language = "English",

volume = "883",

pages = "1--11",

journal = "Astrophysical Journal",

issn = "0004-637X",

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Alcorn, LY, Gupta, A, Tran, K-V, Kacprzak, GG, Yuan, T, Cohn, J, Forrest, B, Glazebrook, K, Harshan, A, Kewley, LJ, Labbé, I, Nanayakkara, T, Papovich, C, Spitler, LR & Straatman, CMS 2019, 'A Tale of two clusters: An analysis of gas-phase metallicity and nebular gas conditions in proto-cluster galaxies at z ∼ 2', Astrophysical Journal, vol. 883, no. 2, 153, pp. 1-11. https://doi.org/10.3847/1538-4357/ab3b0c

TY - JOUR

T1 - A Tale of two clusters

T2 - An analysis of gas-phase metallicity and nebular gas conditions in proto-cluster galaxies at z ∼ 2

AU - Alcorn, Leo Y.

AU - Gupta, Anshu

AU - Tran, Kim-Vy

AU - Kacprzak, Glenn G.

AU - Yuan, Tiantian

AU - Cohn, Jonathan

AU - Forrest, Ben

AU - Glazebrook, Karl

AU - Harshan, Anishya

AU - Kewley, Lisa J.

AU - Labbé, Ivo

AU - Nanayakkara, Themiya

AU - Papovich, Casey

AU - Spitler, Lee R.

AU - Straatman, Caroline M. S.

N1 - Copyright 2019 The American Astronomical Society. First published in the Astrophysical Journal, 883(2), 153, 2019, published by IOP Publishing. The original publication is available at http://www.doi.org/10.3847/1538-4357/ab3b0c. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

PY - 2019/10/1

Y1 - 2019/10/1

N2 - The ZFIRE survey has spectroscopically confirmed two proto-clusters using the MOSFIRE instrument on Keck I: one at z = 2.095 in COSMOS and another at z = 1.62 in UKIRT Infrared Deep Sky Survey (UDS). Here, we use an updated ZFIRE data set to derive the properties of ionized gas regions of proto-cluster galaxies by extracting fluxes from emission lines Hβ 4861 Å, [O III] 5007 Å, Hα 6563 Å, [N II] 6585 Å, and [S II] 6716,6731 Å. We measure gas-phase metallicity of members in both proto-clusters using two indicators, including a strong-line indicator relatively independent of the ionization parameter and electron density. Proto-cluster and field galaxies in both UDS and COSMOS lie on the same Mass-Metallicity Relation with both metallicity indicators. We compare our results to recent Illustris TNG results, which report no significant gas-phase metallicity offset between protocluster and field galaxies until z = 1.5. This is in agreement with our observed metallicities, where no offset is measured between proto-cluster and field populations. We measure tentative evidence from stacked spectra that indicate UDS high-mass proto-cluster and field galaxies have differing [O III]/Hβ. ratios; however, these results are dependent on the sample size of the high-mass stacks.

AB - The ZFIRE survey has spectroscopically confirmed two proto-clusters using the MOSFIRE instrument on Keck I: one at z = 2.095 in COSMOS and another at z = 1.62 in UKIRT Infrared Deep Sky Survey (UDS). Here, we use an updated ZFIRE data set to derive the properties of ionized gas regions of proto-cluster galaxies by extracting fluxes from emission lines Hβ 4861 Å, [O III] 5007 Å, Hα 6563 Å, [N II] 6585 Å, and [S II] 6716,6731 Å. We measure gas-phase metallicity of members in both proto-clusters using two indicators, including a strong-line indicator relatively independent of the ionization parameter and electron density. Proto-cluster and field galaxies in both UDS and COSMOS lie on the same Mass-Metallicity Relation with both metallicity indicators. We compare our results to recent Illustris TNG results, which report no significant gas-phase metallicity offset between protocluster and field galaxies until z = 1.5. This is in agreement with our observed metallicities, where no offset is measured between proto-cluster and field populations. We measure tentative evidence from stacked spectra that indicate UDS high-mass proto-cluster and field galaxies have differing [O III]/Hβ. ratios; however, these results are dependent on the sample size of the high-mass stacks.

KW - galaxies: clusters: general

KW - galaxies: evolution

KW - galaxies: high-redshift

KW - galaxies: Clusters: General

KW - galaxies: Evolution

KW - galaxies: High-redshift

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U2 - 10.3847/1538-4357/ab3b0c

DO - 10.3847/1538-4357/ab3b0c

M3 - Article

SN - 0004-637X

VL - 883

SP - 1

EP - 11

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

M1 - 153

ER -

A Tale of two clusters: An analysis of gas-phase metallicity and nebular gas conditions in proto-cluster galaxies at z ∼ 2

Abstract

Bibliographical note

Keywords

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