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

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


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 languageEnglish
Article number100
Pages (from-to)1-10
Number of pages10
JournalAstrophysical Journal
Issue number2
Publication statusPublished - 10 Mar 2016


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