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Cluster Candidates with Massive Quiescent Galaxies at $Z\sim2$ by Kiyota, Tomokazu; Ando, Makoto; Tanaka, Masayuki; Finoguenov, Alexis; Ali, Sadman Shariar; Coupon, Jean; Desprez, Guillaume; Gwyn, Stephen; Sawicki, Marcin; Shimakawa, Rhythm is a scholarly article available to read on EtoBox.

What is Cluster Candidates with Massive Quiescent Galaxies at $Z\sim2$ about?

Galaxy clusters are crucial to understanding role of the environment in galaxy evolution. However, due to their rarity, only a limited number of clusters have been identified at $z\gtrsim2$. In this paper, we report a discovery of seven cluster candidates with massive quiescent galaxies at $z\sim2$ in the $3.5\,\mathrm{deg}^{2}$ area of the XMM-LSS field, roughly doubling the known cluster sample at this frontier redshift if confirmed. We construct a photometric redshift catalog based on deep ($i\sim26$, $K_\mathrm{s}\sim24$) multi-wavelength photometry from $u^*$-band to $K$-band gathered from the Hyper Suprime-Cam Subaru Strategic Program and other collaborative/public surveys. We adopt a Gaussian kernel density estimate with two different spatial scales (10" and 60") to draw a density map of massive ($\log(M_{*}/M_{\odot})>10.5$) and quiescent ($\log(\mathrm{sSFR\, [\mathrm{yr^{-1}}]})<-10$) galaxies at $z\sim2$. Then, We identify seven prominent overdensities. These candidates show clear red sequences in color-magnitude diagrams ($z-H$ vs. $H$). Moreover, one of them shows an extended X-ray emission with $L_\mathrm{X}=(1.46\pm0.35)\times10^{44}$ erg s$^{-1}$, suggesting its vir

Author

Kiyota, Tomokazu; Ando, Makoto; Tanaka, Masayuki; Finoguenov, Alexis; Ali, Sadman Shariar; Coupon, Jean; Desprez, Guillaume; Gwyn, Stephen; Sawicki, Marcin; Shimakawa, Rhythm

Published

2024

Language

EN