| Title | Deep CFHT Y-band Imaging of VVDS-F22 Field. II. Quasar Selection and Quasar Luminosity Function |
| Authors | Yang, Jinyi Wu, Xue-Bing Liu, Dezi Fan, Xiaohui Yang, Qian Wang, Feige McGreer, Ian D. Fan, Zuhui Yuan, Shuo Shan, Huanyuan |
| Affiliation | Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China. Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China. Univ Arizona, Steward Observ, 933 North Cherry Ave, Tucson, AZ 85721 USA. Argelander Inst Astron, Hugel 71, D-53121 Bonn, Germany. Ecole Polytech Fed Lausanne, Observ Sauverny, Lab Astrophys LASTRO, CH-1290 Versoix, Switzerland. |
| Keywords | galaxies: active galaxies: high-redshift quasars: emission lines quasars: general DIGITAL-SKY-SURVEY GUOSHOUJING TELESCOPE LAMOST STELLAR OBJECTS REDSHIFT EMISSION UKIDSS SDSS EVOLUTION TEMPLATE SAMPLES |
| Issue Date | 2018 |
| Publisher | ASTRONOMICAL JOURNAL |
| Citation | ASTRONOMICAL JOURNAL. 2018, 155(3). |
| Abstract | We report the results of a faint quasar survey in a one-square-degree field. The aim is to test the Y - K/g - z and J - K/i - Y color selection criteria for quasars at faint magnitudes to obtain a complete sample of quasars based on deep optical and near-infrared color-color selection and to measure the faint end of the quasar luminosity function (QLF) over a wide redshift range. We carried out a quasar survey based on the Y - K/g - z and J - K/i - Y quasar selection criteria, using the deep Y-band data obtained from our CFHT/WIRCam Y-band images in a two-degree field within the F22 field of the VIMOS VLT deep survey, optical co-added data from Sloan Digital Sky Survey Stripe 82 and deep near-infrared data from the UKIDSS Deep Extragalactic Survey in the same field. We discovered 25 new quasars at 0.5 < z < 4.5 and i < 22.5 mag within one-square-degree field. The survey significantly increases the number of faint quasars in this field, especially at z similar to 2-3. It confirms that our color selections are highly complete in a wide redshift range (z < 4.5), especially over the quasar number density peak at z similar to 2-3, even for faint quasars. Combining all previous known quasars and new discoveries, we construct a sample with 109 quasars and measure the binned QLF and parametric QLF. Although the sample is small, our results agree with a pure luminosity evolution at lower redshift and luminosity evolution and density evolution model at redshift z > 2.5. |
| URI | http://hdl.handle.net/20.500.11897/510867 |
| ISSN | 0004-6256 |
| DOI | 10.3847/1538-3881/aaa543 |
| Indexed | SCI(E) |
| Appears in Collections: | 物理学院 科维理天文与天体物理研究所 |
