Deep CFHT Y-band Imaging of VVDS-F22 Field. II. Quasar Selection and Quasar Luminosity Function

Jinyi Yang, Xue Bing Wu, Dezi Liu, Xiaohui Fan, Qian Yang, Feige Wang, Ian D. McGreer, Zuhui Fan, Shuo Yuan, Huanyuan Shan

Research output: Contribution to journalArticle

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 ∼ 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.

Original languageEnglish (US)
Article number110
JournalAstronomical Journal
Volume155
Issue number3
DOIs
StatePublished - Mar 1 2018

Fingerprint

quasars
luminosity
near infrared
color

Keywords

  • galaxies: active
  • galaxies: high-redshift
  • quasars: emission lines
  • quasars: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Deep CFHT Y-band Imaging of VVDS-F22 Field. II. Quasar Selection and Quasar Luminosity Function. / Yang, Jinyi; Wu, Xue Bing; Liu, Dezi; Fan, Xiaohui; Yang, Qian; Wang, Feige; McGreer, Ian D.; Fan, Zuhui; Yuan, Shuo; Shan, Huanyuan.

In: Astronomical Journal, Vol. 155, No. 3, 110, 01.03.2018.

Research output: Contribution to journalArticle

Yang, J, Wu, XB, Liu, D, Fan, X, Yang, Q, Wang, F, McGreer, ID, Fan, Z, Yuan, S & Shan, H 2018, 'Deep CFHT Y-band Imaging of VVDS-F22 Field. II. Quasar Selection and Quasar Luminosity Function', Astronomical Journal, vol. 155, no. 3, 110. https://doi.org/10.3847/1538-3881/aaa543
Yang, Jinyi ; Wu, Xue Bing ; Liu, Dezi ; Fan, Xiaohui ; Yang, Qian ; Wang, Feige ; McGreer, Ian D. ; Fan, Zuhui ; Yuan, Shuo ; Shan, Huanyuan. / Deep CFHT Y-band Imaging of VVDS-F22 Field. II. Quasar Selection and Quasar Luminosity Function. In: Astronomical Journal. 2018 ; Vol. 155, No. 3.
@article{11e3618fc262479b96d7b9fd1262dea6,
title = "Deep CFHT Y-band Imaging of VVDS-F22 Field. II. Quasar Selection and Quasar Luminosity Function",
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 ∼ 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.",
keywords = "galaxies: active, galaxies: high-redshift, quasars: emission lines, quasars: general",
author = "Jinyi Yang and Wu, {Xue Bing} and Dezi Liu and Xiaohui Fan and Qian Yang and Feige Wang and McGreer, {Ian D.} and Zuhui Fan and Shuo Yuan and Huanyuan Shan",
year = "2018",
month = "3",
day = "1",
doi = "10.3847/1538-3881/aaa543",
language = "English (US)",
volume = "155",
journal = "Astronomical Journal",
issn = "0004-6256",
publisher = "IOP Publishing Ltd.",
number = "3",

}

TY - JOUR

T1 - Deep CFHT Y-band Imaging of VVDS-F22 Field. II. Quasar Selection and Quasar Luminosity Function

AU - Yang, Jinyi

AU - Wu, Xue Bing

AU - Liu, Dezi

AU - Fan, Xiaohui

AU - Yang, Qian

AU - Wang, Feige

AU - McGreer, Ian D.

AU - Fan, Zuhui

AU - Yuan, Shuo

AU - Shan, Huanyuan

PY - 2018/3/1

Y1 - 2018/3/1

N2 - 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 ∼ 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.

AB - 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 ∼ 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.

KW - galaxies: active

KW - galaxies: high-redshift

KW - quasars: emission lines

KW - quasars: general

UR - http://www.scopus.com/inward/record.url?scp=85043505946&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85043505946&partnerID=8YFLogxK

U2 - 10.3847/1538-3881/aaa543

DO - 10.3847/1538-3881/aaa543

M3 - Article

AN - SCOPUS:85043505946

VL - 155

JO - Astronomical Journal

JF - Astronomical Journal

SN - 0004-6256

IS - 3

M1 - 110

ER -