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名稱Title
2019天文年會
國立自然科學博物館
5月17日至19日

論文摘要

Deep Optical Imaging by Subaru/Hyper Suprime-Cam of the AKARI North Ecliptic Pole Field: Catalog Construction and Analysis of Source Properties of Infrared Galaxies

[ Oral ]

Chien-Chang Ho(Institute of Astronomy, National Tsing Hua University, Hsinchu city, Taiwan), Tomotsugu Goto(Institute of Astronomy, National Tsing Hua University, Hsinchu city, Taiwan), Nagisa Oi(Faculty of Science Division II, Tokyo University of Science, Tokyo, Japan), Seong Jin Kim(Institute of Astronomy, National Tsing Hua University, Hsinchu city, Taiwan), Tetsuya Hashimoto(Institute of Astronomy, National Tsing Hua University, Hsinchu city, Taiwan), Ting-Wen Wang(Institute of Astronomy, National Tsing Hua University, Hsinchu city, Taiwan)

The cosmic star-formation rate density peaks at redshift ~2 and 90% of the star formation is obscured by dust and re-emitted in infrared (Goto et al, 2015). In order to understand the cosmic star-formation history, it is crucial to investigate infrared emission and its optical counterpart. In 2006, AKARI, a space infrared telescope was launched to the space and started its mission. This satellite has made deep mid-IR observation using its continuous 9-band filters in the North Ecliptic Pole (NEP) field (5.4 deg2). However, there are more than 20,000 AKARI’s faint infrared sources without any information on the optical counterparts and redshifts. Therefore, we carried out deep imaging of the NEP field in 5 bands (g, r, i, z, and y) using the Subaru/Hyper Suprime-Cam (HSC). We constructed a band merged photometric catalog covering from the optical u to the Herschel 250 μm band, including WISE and PACS data where available. Based on this catalog, spectral energy distribution fitting analysis were performed by using LePHARE code to compute photometric redshifts. We also discuss physical properties of faint infrared sources in the NEP field as well as an implication on the cosmic star-formation history.