Z-FIRE: ISM Properties of the z = 2.095 Cosmos Cluster
Article
Article Title | Z-FIRE: ISM Properties of the z = 2.095 Cosmos Cluster |
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ERA Journal ID | 1057 |
Article Category | Article |
Authors | Kewley, Lisa J., Yuan, Tiantian, Nanayakkara, Themiya, Kacprzak, Glenn G., Tran, Kim-Vy H., Glazebrook, Karl, Spitler, Lee, Cowley, Michael, Dopita, Michael, Straatman, Caroline, Labbé, Ivo and Tomczak, Adam |
Journal Title | The Astrophysical Journal: an international review of astronomy and astronomical physics |
Journal Citation | 819 (2), pp. 1-10 |
Article Number | 100 |
Number of Pages | 10 |
Year | 2016 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-637X |
1538-4357 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/0004-637X/819/2/100 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/0004-637X/819/2/100 |
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 |
Contains Sensitive Content | Does not contain sensitive content |
Public Notes | For access to this article, please click on the URL link provided. |
Byline Affiliations | Australian National University |
Swinburne University of Technology | |
Texas A&M University, United States | |
Macquarie University | |
Australian Astronomical Observatory, Australia | |
King Abdulaziz University, Saudi Arabia | |
Leiden University, Netherlands |
https://research.usq.edu.au/item/w45xx/z-fire-ism-properties-of-the-z-2-095-cosmos-cluster
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