تقرير
The Infrared Medium-deep Survey. IX. Discovery of Two New $z\sim6$ Quasars and Space Density down to $M_{1450}\sim-23.5$ mag
| العنوان: | The Infrared Medium-deep Survey. IX. Discovery of Two New $z\sim6$ Quasars and Space Density down to $M_{1450}\sim-23.5$ mag |
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| المؤلفون: | Kim, Yongjung, Im, Myungshin, Jeon, Yiseul, Kim, Minjin, Jiang, Linhua, Shin, Suhyun, Choi, Changsu, Hyun, Minhee, Jun, Hyunsung D., Kim, Dohyeong, Kim, Duho, Kim, Jae-Woo, Kim, Ji Hoon, Lee, Bumhyun, Lee, Seong-Kook, Molina, Juan, Pak, Soojong, Park, Won-Kee, Taak, Yoon Chan, Yoon, Yongmin |
| سنة النشر: | 2022 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Astrophysics of Galaxies |
| الوصف: | We present the result of the Infrared Medium-deep Survey (IMS) $z\sim6$ 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 $z\sim6$. The follow-up spectroscopic observations for the remaining four candidates were carried out, and we confirmed that two out of four are $z\sim6$ quasars. With this complete sample, we revisited the quasar space density at $z\sim6$ 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. Comment: 21 pages, 13 figures, 4 tables. Accepted for publication in AJ |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.3847/1538-3881/ac81c8 |
| URL الوصول: | http://arxiv.org/abs/2207.12282 |
| رقم الأكسشن: | edsarx.2207.12282 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.3847/1538-3881/ac81c8 |
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