The absence of an environmental dependence in the mass-metallicity relation at z = 2

Glenn G. Kacprzak, Tiantian Yuan, Themiya Nanayakkara, Chiaki Kobayashi, Kim V Y H Tran, Lisa J. Kewley, Karl Glazebrook, Lee Spitler, Philip Taylor, Michael Cowley, Ivo Labbe, Caroline Straatman, Adam Tomczak

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Abstract

We investigate the environmental dependence of the mass-metallicity relation at z = 2 with MOSFIRE/Keck as part of the ZFIRE survey. Here, we present the chemical abundance of a Virgo-like progenitor at z = 2.095 that has an established red sequence. We identified 43 cluster (〈z〉 = 2.095 ± 0.004 ) and 74 field galaxies (〈z〉 = 2.195 ± 0.083) for which we can measure metallicities. For the first time, we show that there is no discernible difference between the mass-metallicity relation of field and cluster galaxies to within 0.02 dex. Both our field and cluster galaxy mass-metallicity relations are consistent with recent field galaxy studies at z ∼ 2 . We present hydrodynamical simulations for which we derive mass-metallicity relations for field and cluster galaxies. We find at most a 0.1 dex offset toward more metal-rich simulated cluster galaxies. Our results from both simulations and observations suggest that environmental effects, if present, are small and are secondary to the ongoing inflow and outflow processes that are governed by galaxy halo mass.

Original languageEnglish
Article numberL26
Pages (from-to)1-5
Number of pages5
JournalAstrophysical Journal Letters
Volume802
Issue number2
DOIs
Publication statusPublished - 1 Apr 2015

Bibliographical note

Copyright 2015 The American Astronomical Society. Firstly published in the Astrophysical Journal Letters, 802(2), L26, 2015, published by IOP Publishing. The original publication is available at http://www.doi.org/10.1088/2041-8205/802/2/L26. 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.

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