A Direct Measurement of the Linear Bias of Mid-infrared-selected Quasars at z ap 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. HolzapfelS. 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

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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 langzrang ~ 1 selected with the Wide-field Infrared Survey Explorer, over 2500 deg2. The cross-power spectrum is detected at ≈7σ, 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.
Original languageEnglish
Number of pages6
JournalAstrophysical Journal Letters
Volume776
Issue number2
DOIs
Publication statusPublished - 20 Oct 2013

Keywords

  • cosmology: observations

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