Z-FIRE: ISM PROPERTIES of the z = 2.095 COSMOS CLUSTER

Lisa J. Kewley; Tiantian Yuan; Themiya Nanayakkara; Glenn G. Kacprzak; Kim Vy H. Tran; Karl Glazebrook; Lee Spitler; Michael Cowley; Michael Dopita; Caroline Straatman; Ivo Labbé; Adam Tomczak

doi:10.3847/0004-637X/819/2/100

Z-FIRE: ISM PROPERTIES of the z = 2.095 COSMOS CLUSTER

Lisa J. Kewley, Tiantian Yuan, Themiya Nanayakkara, Glenn G. Kacprzak, Kim Vy H. Tran, Karl Glazebrook, Lee Spitler, Michael Cowley, Michael Dopita, Caroline Straatman, Ivo Labbé, Adam Tomczak

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26 Citations (Scopus)

Abstract

We investigate the ISM properties of 13 star-forming galaxies within the z ∼ 2 COSMOS cluster. We show that the cluster members have [N II]/Hα and [O III]/Hβ emission-line ratios similar to z ∼ 2 field galaxies, yet systematically different emission-line ratios (by ∼0.17 dex) from the majority of local star-forming galaxies. We find no statistically significant difference in the [N II]/Hα and [O III]/Hβ line ratios or ISM pressures among the z ∼ 2 cluster galaxies and field galaxies at the same redshift. We show that our cluster galaxies have significantly larger ionization parameters (by up to an order of magnitude) than local star-forming galaxies. We hypothesize that these high ionization parameters may be associated with large specific star formation rates (SFRs; i.e., a large SFR per unit stellar mass). If this hypothesis is correct, then this relationship would have important implications for the geometry and/or the mass of stars contained within individual star clusters as a function of redshift.

Original language	English
Article number	100
Journal	Astrophysical Journal
Volume	819
Issue number	2
DOIs	https://doi.org/10.3847/0004-637X/819/2/100
Publication status	Published - 10 Mar 2016

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@article{133c9597aefa49f5bef13719bff97d56,

title = "Z-FIRE: ISM PROPERTIES of the z = 2.095 COSMOS CLUSTER",

abstract = "We investigate the ISM properties of 13 star-forming galaxies within the z ∼ 2 COSMOS cluster. We show that the cluster members have [N II]/Hα and [O III]/Hβ emission-line ratios similar to z ∼ 2 field galaxies, yet systematically different emission-line ratios (by ∼0.17 dex) from the majority of local star-forming galaxies. We find no statistically significant difference in the [N II]/Hα and [O III]/Hβ line ratios or ISM pressures among the z ∼ 2 cluster galaxies and field galaxies at the same redshift. We show that our cluster galaxies have significantly larger ionization parameters (by up to an order of magnitude) than local star-forming galaxies. We hypothesize that these high ionization parameters may be associated with large specific star formation rates (SFRs; i.e., a large SFR per unit stellar mass). If this hypothesis is correct, then this relationship would have important implications for the geometry and/or the mass of stars contained within individual star clusters as a function of redshift.",

keywords = "galaxies: abundances, galaxies: fundamental parameters, galaxies: starburst",

author = "Kewley, {Lisa J.} and Tiantian Yuan and Themiya Nanayakkara and Kacprzak, {Glenn G.} and Tran, {Kim Vy H.} and Karl Glazebrook and Lee Spitler and Michael Cowley and Michael Dopita and Caroline Straatman and Ivo Labb{\'e} and Adam Tomczak",

year = "2016",

month = mar,

day = "10",

doi = "10.3847/0004-637X/819/2/100",

language = "English",

volume = "819",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "2",

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TY - JOUR

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T2 - ISM PROPERTIES of the z = 2.095 COSMOS CLUSTER

AU - Kewley, Lisa J.

AU - Yuan, Tiantian

AU - Nanayakkara, Themiya

AU - Kacprzak, Glenn G.

AU - Tran, Kim Vy H.

AU - Glazebrook, Karl

AU - Spitler, Lee

AU - Cowley, Michael

AU - Dopita, Michael

AU - Straatman, Caroline

AU - Labbé, Ivo

AU - Tomczak, Adam

PY - 2016/3/10

Y1 - 2016/3/10

N2 - We investigate the ISM properties of 13 star-forming galaxies within the z ∼ 2 COSMOS cluster. We show that the cluster members have [N II]/Hα and [O III]/Hβ emission-line ratios similar to z ∼ 2 field galaxies, yet systematically different emission-line ratios (by ∼0.17 dex) from the majority of local star-forming galaxies. We find no statistically significant difference in the [N II]/Hα and [O III]/Hβ line ratios or ISM pressures among the z ∼ 2 cluster galaxies and field galaxies at the same redshift. We show that our cluster galaxies have significantly larger ionization parameters (by up to an order of magnitude) than local star-forming galaxies. We hypothesize that these high ionization parameters may be associated with large specific star formation rates (SFRs; i.e., a large SFR per unit stellar mass). If this hypothesis is correct, then this relationship would have important implications for the geometry and/or the mass of stars contained within individual star clusters as a function of redshift.

AB - We investigate the ISM properties of 13 star-forming galaxies within the z ∼ 2 COSMOS cluster. We show that the cluster members have [N II]/Hα and [O III]/Hβ emission-line ratios similar to z ∼ 2 field galaxies, yet systematically different emission-line ratios (by ∼0.17 dex) from the majority of local star-forming galaxies. We find no statistically significant difference in the [N II]/Hα and [O III]/Hβ line ratios or ISM pressures among the z ∼ 2 cluster galaxies and field galaxies at the same redshift. We show that our cluster galaxies have significantly larger ionization parameters (by up to an order of magnitude) than local star-forming galaxies. We hypothesize that these high ionization parameters may be associated with large specific star formation rates (SFRs; i.e., a large SFR per unit stellar mass). If this hypothesis is correct, then this relationship would have important implications for the geometry and/or the mass of stars contained within individual star clusters as a function of redshift.

KW - galaxies: abundances

KW - galaxies: fundamental parameters

KW - galaxies: starburst

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U2 - 10.3847/0004-637X/819/2/100

DO - 10.3847/0004-637X/819/2/100

M3 - Article

SN - 0004-637X

VL - 819

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

M1 - 100

ER -

Z-FIRE: ISM PROPERTIES of the z = 2.095 COSMOS CLUSTER

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