February 2-5, 2021

Oral Presentation

The nature of blue dominated clusters and newly discovered overdensites beyond z=1 by HSC2

Author(s): Naoaki Yamamoto (Tohoku University)

Presenter: Naoaki Yamamoto (Tohoku University)

We present the results of distant galaxy cluster survey at z=0.5-1.7 (HSC project 110 : HSC2, which stand for Hybrid Search for Clusters with HSC). It is well known that galaxy stellar mass and the environment around galaxies largely contribute to galaxy quenching. In order to unveil quenching mechanism in wide range of these parameters, we aim to construct distant galaxy cluster sample at z=0.5-1.2 with Subaru/HSC data. To find overdensites of various evolutionary stages, we search for not only (conventional) overdensites of red galaxies but also that of emission line galaxies. Using overdensity catalog of [O3] emission line galaxies at z~0.84, we investigate the environmental dependence of member galaxy properties. Luminosity functions of red galaxies imply that "blue dominated" systems in our sample are younger evolutionary stages than "dual" systems, where both red galaxies and emitters reside. Furthermore, in order to extend our survey in redshift space, we carry out overdensity search beyond z=1 with optical and near infrared data. We discover rich overdensies of [O2] emitters at z=1.47 and z=1.61. The HSC2 project is related to upcoming PFS and other HSC project. These pilot studies of our HSC2 project highlight the potential power to reveil quenching mechanism after cosmic noon.

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