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  The Brightest UV-selected Galaxies in Protoclusters at z ∼ 4: Ancestors of Brightest Cluster Galaxies?

Ito, K., Kashikawa, N., Toshikawa, J., Overzier, R., Tanaka, M., Kubo, M., et al. (2019). The Brightest UV-selected Galaxies in Protoclusters at z ∼ 4: Ancestors of Brightest Cluster Galaxies? The Astrophysical Journal, 878.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-D0D2-2 Version Permalink: https://hdl.handle.net/21.11116/0000-0005-D0D3-1
Genre: Journal Article

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https://ui.adsabs.harvard.edu/abs/2019ApJ...878...68I (Any fulltext)
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 Creators:
Ito, Kei1, Author
Kashikawa, Nobunari1, Author
Toshikawa, Jun1, Author
Overzier, Roderik1, Author
Tanaka, Masayuki1, Author
Kubo, Mariko1, Author
Shibuya, Takatoshi1, Author
Ishikawa, Shogo1, Author
Onoue, Masafusa1, Author
Uchiyama, Hisakazu1, Author
Liang, Yongming1, Author
Higuchi, Ryo1, Author
Martin, Crystal L.1, Author
Lee, Chien-Hsiu1, Author
Komiyama, Yutaka1, Author
Huang, Song1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: early universe galaxies: clusters: general galaxies: high-redshift Astrophysics - Astrophysics of Galaxies
 Abstract: We present the results of a survey of the brightest UV-selected galaxies in protoclusters. These proto-brightest cluster galaxy (proto-BCG) candidates are drawn from 179 overdense regions of g-dropout galaxies at z ∼ 4 from the Hyper Suprime-Cam Subaru Strategic Program identified previously as good protocluster candidates. This study is the first to extend the systematic study of the progenitors of BCGs from z ∼ 2 to z ∼ 4. We carefully remove possible contaminants from foreground galaxies and, for each structure, select the brightest galaxy that is at least 1 mag brighter than the fifth-brightest galaxy. We select 63 proto-BCG candidates and compare their properties with those of galaxies in the field and those of other galaxies in overdense structures. The proto-BCG candidates and their surrounding galaxies have different rest-UV color (i − z) distributions to field galaxies and other galaxies in protoclusters that do not host proto-BCGs. In addition, galaxies surrounding proto-BCGs are brighter than those in protoclusters without proto-BCGs. The image stacking analysis reveals that the average effective radius of proto-BCGs is ∼28% larger than that of field galaxies. The i − z color differences suggest that proto-BCGs and their surrounding galaxies are dustier than other galaxies at z ∼ 4. These results suggest that specific environmental effects or assembly biases have already emerged in some protoclusters as early as z ∼ 4, and we suggest that proto-BCGs have different star formation histories than other galaxies in the same epoch.

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 Dates: 2019
 Publication Status: Issued
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Title: The Astrophysical Journal
Source Genre: Journal
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Pages: - Volume / Issue: 878 Sequence Number: - Start / End Page: - Identifier: -