Deep CFHT Y-band Imaging of VVDS-F22 Field. II. Quasar Selection and Quasar Luminosity Function
- Department of Astronomy, School of Physics, Peking University, Beijing 100871 (China)
- Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871 (China)
- Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721 (United States)
- Argelander-Institut für Astronomie, Auf dem Hügel 71, D-53121 Bonn (Germany)
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<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∼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∼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.
- OSTI ID:
- 22897422
- Journal Information:
- Astronomical Journal (New York, N.Y. Online), Vol. 155, Issue 3; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1538-3881
- Country of Publication:
- United States
- Language:
- English
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