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 ID1057
Article CategoryArticle
AuthorsHung, 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 TitleThe Astrophysical Journal: an international review of astronomy and astronomical physics
Journal Citation826 (2), pp. 1-10
Article Number130
Number of Pages10
Year2016
PublisherIOP Publishing
Place of PublicationUnited States
ISSN0004-637X
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.

Keywordsgalaxies: clusters: general; galaxies: starburst; large-scale structure of universe
Contains Sensitive ContentDoes not contain sensitive content
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FunderUniversity of Texas at Austin
Byline AffiliationsUniversity 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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