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Journal Article

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

MPS-Authors

Ito,  Kei
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kashikawa,  Nobunari
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Toshikawa,  Jun
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Overzier,  Roderik
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Tanaka,  Masayuki
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kubo,  Mariko
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Shibuya,  Takatoshi
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ishikawa,  Shogo
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Onoue,  Masafusa
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Uchiyama,  Hisakazu
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Liang,  Yongming
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Higuchi,  Ryo
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Martin,  Crystal L.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lee,  Chien-Hsiu
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Komiyama,  Yutaka
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Huang,  Song
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2019ApJ...878...68I
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Citation

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.


Cite as: https://hdl.handle.net/21.11116/0000-0005-D0D2-2
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.