Z-FIRE: ISM Properties of the z = 2.095 Cosmos Cluster
Article
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. 2016. "Z-FIRE: ISM Properties of the z = 2.095 Cosmos Cluster." The Astrophysical Journal: an international review of astronomy and astronomical physics. 819 (2), pp. 1-10. https://doi.org/10.3847/0004-637X/819/2/100
| Article Title | Z-FIRE: ISM Properties of the z = 2.095 Cosmos Cluster |
|---|---|
| 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 |
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