Large-scale structure around a z = 2.1 cluster
Article
Hung, Chao-Ling, Casey, Caitlin M., Chiang, Yi-Kuan, Capak, Peter L., Cowley, Michael J., Darvish, Behnam, Kacprzak, Glenn G., Kovač, K., Lilly, Simon J., Nanayakkara, Themiya, Spitler, Lee R., Tran, Kim-Vy H. and Yuan, Tiantian. 2016. "Large-scale structure around a z = 2.1 cluster." The Astrophysical Journal: an international review of astronomy and astronomical physics. 826 (2), pp. 1-10. https://doi.org/10.3847/0004-637X/826/2/130
| Article Title | Large-scale structure around a z = 2.1 cluster |
|---|---|
| ERA Journal ID | 1057 |
| Article Category | Article |
| Authors | Hung, Chao-Ling, Casey, Caitlin M., Chiang, Yi-Kuan, Capak, Peter L., Cowley, Michael J., Darvish, Behnam, Kacprzak, Glenn G., Kovač, K., Lilly, Simon J., Nanayakkara, Themiya, Spitler, Lee R., Tran, Kim-Vy H. and Yuan, Tiantian |
| Journal Title | The Astrophysical Journal: an international review of astronomy and astronomical physics |
| Journal Citation | 826 (2), pp. 1-10 |
| Article Number | 130 |
| 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/826/2/130 |
| Web Address (URL) | https://iopscience.iop.org/article/10.3847/0004-637X/826/2/130 |
| Abstract | The most prodigious starburst galaxies are absent in massive galaxy clusters today, but their connection with largescale environments is less clear at z ≳ 2. We present a search of large-scale structure around a galaxy cluster core at z = 2.095 using a set of spectroscopically confirmed galaxies. We find that both color-selected star-forming galaxies (SFGs) and dusty star-forming galaxies (DSFGs) show significant overdensities around the z = 2.095 cluster. A total of eight DSFGs (including three X-ray luminous active galactic nuclei, AGNs) and 34 SFGs are found within a 10 radius (corresponds to ∼15 cMpc at z ∼ 2.1) from the cluster center and within a redshift range of Δz = 0.02, which leads to galaxy overdensities of δDSFG ∼ 12.3 and δSFG ∼ 2.8. The cluster core and the extended DSFG- and SFG-rich structures together demonstrate an active cluster formation phase, in which the cluster is accreting a significant amount of material from large-scale structure while the more mature core may begin to virialize. Our finding of this DSFG-rich structure, along with a number of other protoclusters with excess DSFGs and AGNs found to date, suggest that the overdensities of these rare sources indeed trace significant mass overdensities. However, it remains puzzling how these intense star formers are triggered concurrently. Although an increased probability of galaxy interactions and/or enhanced gas supply can trigger the excess of DSFGs, our stacking analysis based on 850 μm images and morphological analysis based on rest-frame optical imaging do not show such enhancements of merger fraction and gas content in this structure. |
| Keywords | galaxies: clusters: general; galaxies: starburst; large-scale structure of universe |
| Contains Sensitive Content | Does not contain sensitive content |
| Public Notes | For access to this article, please click on the URL link provided. |
| Funder | University of Texas at Austin |
| Byline Affiliations | University of Texas at Austin, United States |
| California Institute of Technology (Caltech), United States | |
| Macquarie University | |
| Australian Astronomical Observatory, Australia | |
| Swinburne University of Technology | |
| Swiss Federal Institute of Technology, Switzerland | |
| Texas A&M University, United States | |
| Australian National University |
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