| Title | A SURVEY OF LUMINOUS HIGH-REDSHIFT QUASARS WITH SDSS AND WISE. I. TARGET SELECTION AND OPTICAL SPECTROSCOPY |
| Authors | Wang, Feige Wu, Xue-Bing Fan, Xiaohui Yang, Jinyi Yi, Weimin Bian, Fuyan McGreer, Ian D. Yang, Qian Ai, Yanli Dong, Xiaoyi Zuo, Wenwen Jiang, Linhua Green, Richard Wang, Shu Cai, Zheng Wang, Ran Yue, Minghao |
| Affiliation | Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China. Univ Arizona, Steward Observ, 933 North Cherry Ave, Tucson, AZ 85721 USA. Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China. Chinese Acad Sci, Yunnan Observ, Kunming 650011, Peoples R China. Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, Kunming 650011, Peoples R China. Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia. Sun Yat Sen Univ, Sch Phys & Astron, Guangzhou 510275, Guangdong, Peoples R China. Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China. Univ Calif Santa Cruz, UCO Lick Observ, 1156 High St, Santa Cruz, CA 95064 USA. Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China. Wang, FG (reprint author), Univ Arizona, Steward Observ, 933 North Cherry Ave, Tucson, AZ 85721 USA. |
| Keywords | galaxies: active galaxies: high-redshift quasars: emission lines quasars: general DIGITAL-SKY-SURVEY SURVEY COMMISSIONING DATA FIELD SPECTROGRAPH WIFES SPECTRAL ENERGY-DISTRIBUTIONS INFRARED-SURVEY-EXPLORER GALAXY EVOLUTION SURVEY GREATER-THAN 6 DATA RELEASE Z-GREATER-THAN-5.7 QUASARS ADDITIONAL QUASARS |
| Issue Date | 2016 |
| Publisher | ASTROPHYSICAL JOURNAL |
| Citation | ASTROPHYSICAL JOURNAL.2016,819,(1). |
| Abstract | High-redshift quasars are important tracers of structure and evolution in the early universe. However, they are very rare and difficult to find when using color selection because of contamination from late-type dwarfs. High-redshift quasar surveys based on only optical colors suffer from incompleteness and low identification efficiency, especially at z greater than or similar to 4.5. We have developed a new method to select 4.7 less than or similar to z less than or similar to 5.4 quasars with both high efficiency and completeness by combining optical and mid-IR Wide-field Infrared Survey Explorer (WISE) photometric data, and are conducting a luminous z similar to 5 quasar survey in the whole Sloan Digital Sky Survey (SDSS) footprint. We have spectroscopically observed 99 out of 110 candidates with z-band magnitudes brighter than 19.5, and 64 (64.6%) of them are quasars with redshifts of 4.4 less than or similar to z less than or similar to 5.5 and absolute magnitudes of -29 less than or similar to M-1450 less than or similar to -26.4. In addition, we also observed 14 fainter candidates selected with the same criteria and identified 8 (57.1%) of them as quasars with 4.7 < z < 5.4. Among 72 newly identified quasars, 12 of them are at 5.2 < z < 5.7, which leads to an increase of similar to 36% of the number of known quasars at this redshift range. More importantly, our identifications doubled the number of quasars with M1450 < -27.5 at z > 4.5, which will set strong constraints on the bright end of the quasar luminosity function. We also expand our method to select quasars at z greater than or similar to 5.7. In this paper we report the discovery of four new luminous z greater than or similar to 5.7 quasars based on SDSS WISE selection. |
| URI | http://hdl.handle.net/20.500.11897/438528 |
| ISSN | 0004-637X |
| DOI | 10.3847/0004-637X/819/1/24 |
| Indexed | SCI(E) |
| Appears in Collections: | 物理学院 科维理天文与天体物理研究所 |
