A Direct Measurement of the Linear Bias of Mid-infrared-selected Quasars at z ap 1 Using Cosmic Microwave Background Lensing

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., Montroy, T.~E., Myers, A.~D., Padin, S., Plagge, T., Pryke, C., Reichardt, C.~L., Ruhl, J.~E., Sayre, J.~T., Schaffer, K.~K., Shaw, L., Shirokoff, E., Spieler, H.~G., Staniszewski, Z., Stark, A.~A., Story, K.~T., van Engelen, A., Vanderlinde, K., Vieira, J.~D., Williamson, R. and Zahn, O. (2013) A Direct Measurement of the Linear Bias of Mid-infrared-selected Quasars at z ap 1 Using Cosmic Microwave Background Lensing. Astrophysical Journal Letters, 776 (2). ISSN 2041-8205
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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.
Item Type Article
Keywords cosmology: observations
Date Deposited 15 May 2025 13:08
Last Modified 31 May 2025 00:05

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