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The Infrared Medium-deep Survey. VIII. Quasar Luminosity Function at z ∼ 5

2020; IOP Publishing; Volume: 904; Issue: 2 Linguagem: Inglês

10.3847/1538-4357/abc0ea

1538-4357

Yongjung Kim, Myungshin Im, Yiseul Jeon, Minjin Kim, Soojong Pak, Minhee Hyun, Yoon Chan Taak, Suhyun Shin, Gu Lim, Gregory S. H. Paek, Insu Paek, Linhua Jiang, Changsu Choi, Jueun Hong, Tae-Geun Ji, Hyunsung D. Jun, Marios Karouzos, Dohyeong Kim, Duho Kim, Jae-Woo Kim, Ji Hoon Kim, Hyein Lee, Seong-Kook Lee, Won-Kee Park, Yongmin Yoon, Seoyeon Byeon, Sungyong Hwang, Joonho Kim, Sophia Kim, Woojin Park,

Gamma-ray bursts and supernovae

Faint $z\sim5$ quasars with $M_{1450}\sim-23$ mag are known to be the potentially important contributors to the ultraviolet ionizing background in the post-reionization era. However, their number density has not been well determined, making it difficult to assess their role in the early ionization of the intergalactic medium (IGM). In this work, we present the updated results of our $z\sim5$ quasar survey using the Infrared Medium-deep Survey (IMS), a near-infrared imaging survey covering an area of 85 deg$^{2}$. From our spectroscopic observations with the Gemini Multi-Object Spectrograph (GMOS) on the Gemini-South 8 m Telescope, we discovered eight new quasars at $z\sim5$ with $-26.1\leq M_{1450} \leq -23.3$. Combining our IMS faint quasars ($M_{1450}>-27$ mag) with the brighter Sloan Digital Sky Survey (SDSS) quasars ($M_{1450}