Oral Presentation

Hα emitters at z ~ 2 in the SWIMS MBF observation in COSMOS-ZFOURGE field

Author(s): Nuo Chen (Univ. of Tokyo), Kentaro Motohara (NAOJ), Lee Spitler (Macquarie University), Masahiro Konishi (Univ. of Tokyo), Hidenori Takahashi (Univ. of Tokyo), Kosuke Kushibiki (Univ. of Tokyo), Hiroki Nakamura (Univ. of Tokyo), Yasunori Terao

Presenter: Nuo Chen (The University of Toyko)

Motivations. Recent surveys have reached a robust conclusion that the cosmic star formation rate density peaks around z ~ 2, a period also called “Cosmic noon”. However, the use of various SFR indicators has prevented a clear picture of the star formation history of the Universe during this time. Among these indicators, Hα is the most direct estimate of the instantaneous SFR when compared to other widely used tracers, such as UV, FIR or radio.
Data. We present a pioneering study of 3.5 hours worth of imaging data in the Medium-band filters (MBF), K1 (2.03μm) & K2 (2.17μm), by SWIMS on the Subaru Telescope in 2019. This observation covers a 6.6'x 3.3' FOV of COSMOS-ZFOURGE field with depths of 24.3 AB mag in K1 and 24.4 AB mag in K2 (3