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

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arxiv 1506.07525 v1 pith:MZ7WCQLZ submitted 2015-06-24 astro-ph.GA astro-ph.CO

classification astro-ph.GAastro-ph.CO
keywords galaxiesclusterratiosstarstar-formingcosmosemission-linefield
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We investigate the ISM properties of 13 star-forming galaxies within the z~2 COSMOS cluster. We show that the cluster members have [NII]/Ha and [OIII]/Hb 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 [NII]/Ha and [OIII]/Hb 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 (i.e. a large star formation rate 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.

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  1. The Cosmic Evolution Early Release Science Survey (CEERS)

    astro-ph.GA 2025-01 conditional novelty 5.0 of 10

    The CEERS survey overview shows that coordinated parallel JWST observations in the EGS field work as designed and have generated a public legacy dataset that enabled extensive early-universe science.

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