Poster Presentation

Study of Galaxies in dense environment of redshift z~1 in CFHTLS Wide Field W2

Author(s): Insu Paek(SNU), Myungshin Im(SNU), Jaewoo Kim(KASI), Minhee Hyun(SNU), Dohyung Kim(Pusan National University), Yongjung Kim(Peking University), Yongmin Yoon(KIAS), Yoonchan Taak(SNU), IMS team(SNU)

Presenter: Insu Paek (Seoul National University)

Unlike local universe, where galaxies in cluster environments tend to show low star formation, galaxies at higher redshifts z~2 had active star formation even in dense environments. In this regard, studying the star formation activity of galaxies in z~1 can provide insights into the quenching process of galaxies. Especially, the study of those within high density environment let us study the effect of environment on quenching process. The optical photometric data from the Canada-France-Hawaii Telescope Legacy Survey(CFHTLS) and NIR data from Intermediate-wide, Medium-deep Survey(IMS) are both deep enough to study galaxies z~1, and wide enough (25 square degrees of CFHTLS W2 field) to study the larger surrounding density structure. The density structure of CFHTLS W2 field has been mapped into photometric redshift space from z~0.6 to z~1.4. We conducted Multi-Object Spectroscopy on nineteen galaxy cluster candidates at z~0.7-1.1 and neighboring field galaxies to measure spectroscopic redshift, confirm cluster membership, and study the physical properties using Inamori Magellan Areal Camera and Spectrograph (IMACS) in 2016. This study presents the preliminary results on the high redshift galaxy clusters and groups in the region in relation to the density environment.