NOAO >   Observing Info >   Approved Programs >   2016A-0395

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Program Information for 2016A-0395


PI: Mana Niida, Ehime University, niida@cosmos.phys.sci.ehime-u.ac.jp
Address: Graduate School of Science and Engineering, Bunkyo-cho 2-5, Matsuyama, Ehime 790-8577 Japan

CoI: Tohru Nagao, Ehime University
CoI: Hiroyuki Ikeda, NAOJ
CoI: Masayuki Akiyama, Tohoku University
CoI: Kenta Matsuoka, Kyoto University
CoI: Yoshiki Toba, Ehime University
CoI: Yoshiaki Taniguchi, Ehime University
CoI: Masakazu Kobayashi, Ehime University
CoI: Yoshihiro Ueda, Kyoto University
CoI: Toshihiro Kawaguchi, Sapporo Medical University
CoI: Tomoki Morokuma, University of Tokyo
CoI: Yoshiki Matsuoka, NAOJ
CoI: Yuichi Terashima, Ehime University
CoI: Masafusa Onoue, The Graduate University for Advanced Studies

Title: Quasar Evolution in the Early Universe: Down-sizing or Up-sizing?

Abstract: Recent observations have suggested that the redshift evolution of the quasar number density is luminosity-dependent, in the sense that more luminous quasars show the peak of the number density at higher redshift (quasar down-sizing). However, this trend could be inverted (quasar up-sizing) at $z sim 5$ as suggested from deep X-ray observations, though it is totally unclear due to insufficient area and sensitivity in past optical surveys. To reveal the evolution of supermassive black holes (SMBHs), measuring the quasar luminosity function (QLF) for a faint side at $z sim 5$ is essential. We select new 8 candidates of low-luminosity quasar at $z sim 5$ from the HSC 109 deg$^2$ images. Then propose to obtain the optical spectra for the candidates, to determine their redshift and faint-end QLF. We also investigate the mass of SMBH ($M_{ m BH}$) and eddington ratio ($lambda_{ m edd}$), for understanding the evolution of SMBHs in the cosmological timescale. Thanks to the newly commissioned wide-field camera of Subaru, HSC, we can study such faint quasars at $z sim 5$ for the first time.

Program Type: Standard/Extragalactic

Scheduled Nights:
Run 1 (2016A):  CT-4m/COSMOS -- 4n on Apr 12 - Apr 15 2016


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NOAO >   Observing Info >   Approved Programs >   2016A-0395

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