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- W4293576380 abstract "We present the result of the Infrared Medium-deep Survey (IMS) $zsim6$ quasar survey, using the combination of the IMS near-infrared images and the Canada-France-Hawaii Telescope Legacy Survey (CFHTLS) optical images. The traditional color-selection method results in 25 quasar candidates over $86$ deg$^{2}$. We introduce the corrected Akaike Information Criterion (AICc) with the high-redshift quasar and late-type star models to prioritize the candidates efficiently. Among the color-selected candidates, seven plausible candidates finally passed the AICc selection of which three are known quasars at $zsim6$. The follow-up spectroscopic observations for the remaining four candidates were carried out, and we confirmed that two out of four are $zsim6$ quasars. With this complete sample, we revisited the quasar space density at $zsim6$ down to $M_{1450}sim-23.5$ mag. Our result supports the low quasar space density at the luminosity where the quasar's ultraviolet ionizing emissivity peaks, favoring a minor contribution of quasars to the cosmic reionization." @default.
- W4293576380 created "2022-08-30" @default.
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- W4293576380 date "2022-08-30" @default.
- W4293576380 modified "2023-09-25" @default.
- W4293576380 title "The Infrared Medium-deep Survey. IX. Discovery of Two New z ∼ 6 Quasars and Space Density Down to M <sub>1450</sub> ∼ −23.5 mag" @default.
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