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

doi:10.1088/2041-8205/776/2/L41

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. 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

Physics and Astronomy (Twin Cities)

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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 〈z〉 ∼ 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 language	English (US)
Article number	L41
Journal	Astrophysical Journal Letters
Volume	776
Issue number	2
DOIs	https://doi.org/10.1088/2041-8205/776/2/L41
State	Published - Oct 20 2013

Keywords

cosmology: observations

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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., ... Zahn, O. (2013). A direct measurement of the linear bias of mid-infrared-selected quasars at z ≈ 1 using cosmic microwave background lensing. Astrophysical Journal Letters, 776(2), Article L41. https://doi.org/10.1088/2041-8205/776/2/L41

Geach, JE, Hickox, RC, Bleem, LE, Brodwin, M, Holder, GP, Aird, KA, Benson, BA, Bhattacharya, S, Carlstrom, JE, Chang, CL, Cho, HM, Crawford, TM, Crites, AT, De Haan, T, Dobbs, MA, Dudley, J, George, EM, Hainline, KN, Halverson, NW, Holzapfel, WL, Hoover, S, Hou, Z, Hrubes, JD, Keisler, R, Knox, L, Lee, AT, Leitch, EM, Lueker, M, Luong-Van, D, Marrone, DP, McMahon, JJ, Mehl, J, Meyer, SS, Millea, M, Mohr, JJ, Montroy, TE, Myers, AD, Padin, S, Plagge, T, Pryke, C, Reichardt, CL, Ruhl, JE, Sayre, JT, Schaffer, KK, Shaw, L, Shirokoff, E, Spieler, HG, Staniszewski, Z, Stark, AA, Story, KT, Van Engelen, A, Vanderlinde, K, Vieira, JD, Williamson, R & Zahn, O 2013, 'A direct measurement of the linear bias of mid-infrared-selected quasars at z ≈ 1 using cosmic microwave background lensing', Astrophysical Journal Letters, vol. 776, no. 2, L41. https://doi.org/10.1088/2041-8205/776/2/L41

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title = "A direct measurement of the linear bias of mid-infrared-selected quasars at z ≈ 1 using cosmic microwave background lensing",

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 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.",

keywords = "cosmology: observations",

author = "Geach, {J. E.} and Hickox, {R. C.} and Bleem, {L. E.} and M. Brodwin and Holder, {G. P.} and Aird, {K. A.} and Benson, {B. A.} and S. Bhattacharya and Carlstrom, {J. E.} and Chang, {C. L.} and Cho, {H. M.} and Crawford, {T. M.} and Crites, {A. T.} and {De Haan}, T. and Dobbs, {M. A.} and J. Dudley and George, {E. M.} and Hainline, {K. N.} and Halverson, {N. W.} and Holzapfel, {W. L.} and S. Hoover and Z. Hou and Hrubes, {J. D.} and R. Keisler and L. Knox and Lee, {A. T.} and Leitch, {E. M.} and M. Lueker and D. Luong-Van and Marrone, {D. P.} and McMahon, {J. J.} and J. Mehl and Meyer, {S. S.} and M. Millea and Mohr, {J. J.} and Montroy, {T. E.} and Myers, {A. D.} and S. Padin and T. Plagge and C. Pryke and Reichardt, {C. L.} and Ruhl, {J. E.} and Sayre, {J. T.} and Schaffer, {K. K.} and L. Shaw and E. Shirokoff and Spieler, {H. G.} and Z. Staniszewski and Stark, {A. A.} and Story, {K. T.} and {Van Engelen}, A. and K. Vanderlinde and Vieira, {J. D.} and R. Williamson and O. Zahn",

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TY - JOUR

T1 - A direct measurement of the linear bias of mid-infrared-selected quasars at z ≈ 1 using cosmic microwave background lensing

AU - Geach, J. E.

AU - Hickox, R. C.

AU - Bleem, L. E.

AU - Brodwin, M.

AU - Holder, G. P.

AU - Aird, K. A.

AU - Benson, B. A.

AU - Bhattacharya, S.

AU - Carlstrom, J. E.

AU - Chang, C. L.

AU - Cho, H. M.

AU - Crawford, T. M.

AU - Crites, A. T.

AU - De Haan, T.

AU - Dobbs, M. A.

AU - Dudley, J.

AU - George, E. M.

AU - Hainline, K. N.

AU - Halverson, N. W.

AU - Holzapfel, W. L.

AU - Hoover, S.

AU - Hou, Z.

AU - Hrubes, J. D.

AU - Keisler, R.

AU - Knox, L.

AU - Lee, A. T.

AU - Leitch, E. M.

AU - Lueker, M.

AU - Luong-Van, D.

AU - Marrone, D. P.

AU - McMahon, J. J.

AU - Mehl, J.

AU - Meyer, S. S.

AU - Millea, M.

AU - Mohr, J. J.

AU - Montroy, T. E.

AU - Myers, A. D.

AU - Padin, S.

AU - Plagge, T.

AU - Pryke, C.

AU - Reichardt, C. L.

AU - Ruhl, J. E.

AU - Sayre, J. T.

AU - Schaffer, K. K.

AU - Shaw, L.

AU - Shirokoff, E.

AU - Spieler, H. G.

AU - Staniszewski, Z.

AU - Stark, A. A.

AU - Story, K. T.

AU - Van Engelen, A.

AU - Vanderlinde, K.

AU - Vieira, J. D.

AU - Williamson, R.

AU - Zahn, O.

PY - 2013/10/20

Y1 - 2013/10/20

N2 - 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 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.

AB - 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 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.

KW - cosmology: observations

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UR - http://www.scopus.com/inward/citedby.url?scp=84885362978&partnerID=8YFLogxK

U2 - 10.1088/2041-8205/776/2/L41

DO - 10.1088/2041-8205/776/2/L41

M3 - Article

AN - SCOPUS:84885362978

SN - 2041-8205

VL - 776

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

IS - 2

M1 - L41

ER -

A direct measurement of the linear bias of mid-infrared-selected quasars at z ≈ 1 using cosmic microwave background lensing

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