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19 April 2024

» arxiv » 1307.1706

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A direct measurement of the linear bias of mid-infrared-selected quasars at z~1 using cosmic microwave background lensing
J. E. Geach ; R. C. Hickox ; L. E. Bleem ; M. Brodwin ; G. P. Holder ; K. A. Aird ; B. A. Benson ; S. Bhattacharya ; J. E. Carlstrom ; C. L. Chang ; H-M. Cho ; T. M. Crawford ; A. T. Crites ; T. de Haan ; M. A. Dobbs ; J. Dudley ; E. M. George ; K. N. Hainline ; N. W. Halverson ; W. L. Holzapfel ; S. Hoover ; Z. Hou ; J. D. Hrubes ; R. Keisler ; L. Knox ; A. T. Lee ; E. M. Leitch ; M. Lueker ; D. Luong-Van ; D.P. Marrone ; J. J. McMahon ; J. Mehl ; S. S. Meyer ; M. Millea ; J. J. Mohr ; T. E. Montroy ; A. D. Myers ; S. Padin ; T. Plagge ; C. Pryke ; C. L. Reichardt ; J. E. Ruhl ; J. T. Sayre ; K. K. Schaffer ; L. Shaw ; E. Shirokoff ; H. G. Spieler ; Z. Staniszewski ; A. A. Stark ; K. T. Story ; A. van Engelen ; K. Vanderlinde ; J. D. Vieira ; R. Williamson ; O. Zahn ;
Date:	5 Jul 2013
Abstract:	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 z~1 selected with the Wide-field Infrared Survey Explorer, over 2500 deg^2. The cross-power spectrum is detected at ~7-sigma, and we measure a linear bias b=1.67+/-0.24, 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 that obscured and unobscured quasars must trace the matter field in a similar way. This result has implications for our understanding of quasar unification and evolution schemes.
Source:	arXiv, 1307.1706
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