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We investigate the ISM properties of 13 star-forming galaxies within the z~2COSMOS cluster. We show that the cluster members have [NII]/Ha and [OIII]/Hbemission-line ratios similar to z~2 field galaxies, yet systematicallydifferent emission-line ratios (by ~0.17 dex) from the majority of localstar-forming galaxies. We find no statistically significant difference in the[NII]/Ha and [OIII]/Hb line ratios or ISM pressures among the z~2 clustergalaxies and field galaxies at the same redshift. We show that our clustergalaxies have significantly larger ionization parameters (by up to an order ofmagnitude) than local star-forming galaxies. We hypothesize that these highionization parameters may be associated with large specific star formationrates (i.e. a large star formation rate per unit stellar mass). If thishypothesis is correct, then this relationship would have important implicationsfor the geometry and/or the mass of stars contained within individual starclusters as a function of redshift.

Z-FIRE: ISM properties of the z = 2.095 COSMOS Cluster