February 2-5, 2021

Oral Presentation

The interrelation of the environment of Lyα emitters and massive galaxies at 2<z<4.5

Author(s): Kei Ito(NAOJ), Nobunari Kashikawa(U. Tokyo), Masayuki Tanaka(NAOJ), Mariko Kubo(Ehime U.), Yongming Liang (NAOJ), Jun Toshikawa(U. Tokyo), Hisakazu Uchiyama(NAOJ), Rikako Ishimoto(U. Tokyo), Takehiro Yoshioka(U. Tokyo), and Yoshihiro Takeda(U. Tokyo)

Presenter: Kei Ito (NAOJ/SOKENDAI)

In the last few decades, the large-scale structure at high-redshift is energetically investigated. On the other hand, it is not clearly understood whether different galaxy populations trace the same large-scale structure. Here, we present a comparison of the spatial distributions of Lyα emitters (LAEs) and massive star-forming and quiescent galaxies (SFGs and QGs) at 2<z<4.5. We use the Cosmic Evolution Survey (COSMOS) photometric redshift catalog to select SFGs and QGs, and an LAE catalog from intermediate/narrow bands obtained from the Subaru Telescope and Isaac-Newton Telescope. We derive the auto-/cross- correlation signals of SFGs, QGs, and LAEs, and the galaxy overdensity distributions at the position of them. Whereas the cross-correlation signals of SFGs and QGs are explained solely by their halo mass difference, those of SFGs and LAEs are significantly lower than their auto-correlation signals, suggesting that some baryonic mechanism is segregating these two populations. Overdensity distributions support these trends, in which LAEs are located in less dense regions than SFGs and QGs, whereas SFGs and QGs tend to be in the same environment. This result reinforces the importance of exploring multiple galaxy populations in quantifying the intrinsic galaxy environment of the high-z universe.

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