A DIRECT MEASUREMENT OF THE LINEAR BIAS OF MID-INFRARED-SELECTED QUASARS AT z approximate to 1 USING COSMIC MICROWAVE BACKGROUND LENSING

作者：Geach J E^*; Hickox R C; Bleem L E; Brodwin M; Holder G P; Aird K A; Benson B A; Bhattacharya S; Carlstrom J E; Chang C L; Cho H M; Crawford T M; Crites A T; de Haan T; Dobbs M A; Dudley J; George E M; Hainline K N; Halverson N W; Holzapfel W L; Hoover S; Hou Z; Hrubes J D; Keisler R; Knox L; Lee A T; Leitch E M; Lueker M; Luong Van D; Marrone D P; McMahon J J; Mehl J; Meyer S S; Millea M; Mohr J J

来源：Astrophysical Journal Letters, 2013, 776(2): L41.

DOI：10.1088/2041-8205/776/2/L41

• cosmology: observations

We measure the cross-power spectrum of the projected mass density as traced by the convergence of the cosmic microwave background lensing field from the South Pole Telescope (SPT) and a sample of Type 1 and 2 (unobscured and obscured) quasars at %26lt; z %26gt; similar to 1 selected with the Wide-field Infrared Survey Explorer, over 2500 deg(2). The cross-power spectrum is detected at approximate to 7 sigma, and we measure a linear bias b = 1.61 +/- 0.22, consistent with clustering analyses. Using an independent lensing map, derived from Planck observations, to measure the cross-spectrum, we find excellent agreement with the SPT analysis. The bias of the combined sample of Type 1 and 2 quasars determined in this work is similar to that previously determined for Type 1 quasars alone; we conclude that obscured and unobscured quasars trace the matter field in a similar way. This result has implications for our understanding of quasar unification and evolution schemes.

• 出版日期2013-10-20
• 单位McGill