The atacama cosmology telescope: Cosmological parameters from the 2008 power spectrum

J. Dunkley; R. Hlozek; J. Sievers; V. Acquaviva; P. A.R. Ade; P. Aguirre; M. Amiri; J. W. Appel; L. F. Barrientos; E. S. Battistelli; J. R. Bond; B. Brown; B. Burger; J. Chervenak; S. Das; M. J. Devlin; S. R. Dicker; W. Bertrand Doriese; R. Dünner; T. Essinger-Hileman; R. P. Fisher; J. W. Fowler; A. Hajian; M. Halpern; M. Hasselfield; C. Hernndez-Monteagudo; G. C. Hilton; M. Hilton; A. D. Hincks; K. M. Huffenberger; D. H. Hughes; J. P. Hughes; L. Infante; K. D. Irwin; J. B. Juin; M. Kaul; J. Klein; A. Kosowsky; J. M. Lau; M. Limon; Y. T. Lin; R. H. Lupton; T. A. Marriage; D. Marsden; P. Mauskopf; F. Menanteau; K. Moodley; H. Moseley; C. B. Netterfield; M. D. Niemack; M. R. Nolta; L. A. Page; L. Parker; B. Partridge; B. Reid; N. Sehgal; B. Sherwin; D. N. Spergel; S. T. Staggs; D. S. Swetz; E. R. Switzer; R. Thornton; H. Trac; C. Tucker; R. Warne; E. Wollack; Y. Zhao

doi:10.1088/0004-637X/739/1/52

The atacama cosmology telescope: Cosmological parameters from the 2008 power spectrum

J. Dunkley, R. Hlozek, J. Sievers, V. Acquaviva, P. A.R. Ade, P. Aguirre, M. Amiri, J. W. Appel, L. F. Barrientos, E. S. Battistelli, J. R. Bond, B. Brown, B. Burger, J. Chervenak, S. Das, M. J. Devlin, S. R. Dicker, W. Bertrand Doriese, R. Dünner, T. Essinger-HilemanR. P. Fisher, J. W. Fowler, A. Hajian, M. Halpern, M. Hasselfield, C. Hernndez-Monteagudo, G. C. Hilton, M. Hilton, A. D. Hincks, K. M. Huffenberger, D. H. Hughes, J. P. Hughes, L. Infante, K. D. Irwin, J. B. Juin, M. Kaul, J. Klein, A. Kosowsky, J. M. Lau, M. Limon, Y. T. Lin, R. H. Lupton, T. A. Marriage, D. Marsden, P. Mauskopf, F. Menanteau, K. Moodley, H. Moseley, C. B. Netterfield, M. D. Niemack, M. R. Nolta, L. A. Page, L. Parker, B. Partridge, B. Reid, N. Sehgal, B. Sherwin, D. N. Spergel, S. T. Staggs, D. S. Swetz, E. R. Switzer, R. Thornton, H. Trac, C. Tucker, R. Warne, E. Wollack, Y. Zhao

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337 Scopus citations

Abstract

We present cosmological parameters derived from the angular power spectrum of the cosmic microwave background (CMB) radiation observed at 148GHz and 218GHz over 296deg² with the Atacama Cosmology Telescope (ACT) during its 2008 season. ACT measures fluctuations at scales 500 < ℓ < 10, 000. We fit a model for the lensed CMB, Sunyaev-Zel'dovich (SZ), and foreground contribution to the 148GHz and 218GHz power spectra, including thermal and kinetic SZ, Poisson power from radio and infrared point sources, and clustered power from infrared point sources. At ℓ = 3000, about half the power at 148GHz comes from primary CMB after masking bright radio sources. The power from thermal and kinetic SZ is estimated to be , where . The IR Poisson power at 148GHz is (C _ℓ = 5.5 0.5 nK²), and a clustered IR component is required with , assuming an analytic model for its power spectrum shape. At 218GHz only about 15% of the power, approximately 27 μK ², is CMB anisotropy at ℓ = 3000. The remaining 85% is attributed to IR sources (approximately 50% Poisson and 35% clustered), with spectral index α = 3.69 0.14 for flux scaling as S(ν)ν^α. We estimate primary cosmological parameters from the less contaminated 148GHz spectrum, marginalizing over SZ and source power. The ΛCDM cosmological model is a good fit to the data (χ²/dof = 29/46), and ΛCDM parameters estimated from ACT+Wilkinson Microwave Anisotropy Probe (WMAP) are consistent with the seven-year WMAP limits, with scale invariant n_s = 1 excluded at 99.7% confidence level (CL) (3σ). A model with no CMB lensing is disfavored at 2.8σ. By measuring the third to seventh acoustic peaks, and probing the Silk damping regime, the ACT data improve limits on cosmological parameters that affect the small-scale CMB power. The ACT data combined with WMAP give a 6σ detection of primordial helium, with Y _P = 0.313 0.044, and a 4σ detection of relativistic species, assumed to be neutrinos, with N _eff = 5.3 1.3 (4.6 0.8 with BAO+H ₀ data). From the CMB alone the running of the spectral index is constrained to be dn_s /dln k = -0.034 0.018, the limit on the tensor-to-scalar ratio is r < 0.25 (95% CL), and the possible contribution of Nambu cosmic strings to the power spectrum is constrained to string tension Gμ < 1.6 × 10^-7 (95% CL).

Original language	English (US)
Article number	52
Journal	Astrophysical Journal
Volume	739
Issue number	1
DOIs	https://doi.org/10.1088/0004-637X/739/1/52
State	Published - Sep 20 2011
Externally published	Yes

Keywords

cosmic background radiation
cosmological parameters
cosmology: observations

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1088/0004-637X/739/1/52

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Dunkley, J., Hlozek, R., Sievers, J., Acquaviva, V., Ade, P. A. R., Aguirre, P., Amiri, M., Appel, J. W., Barrientos, L. F., Battistelli, E. S., Bond, J. R., Brown, B., Burger, B., Chervenak, J., Das, S., Devlin, M. J., Dicker, S. R., Doriese, W. B., Dünner, R., ... Zhao, Y. (2011). The atacama cosmology telescope: Cosmological parameters from the 2008 power spectrum. Astrophysical Journal, 739(1), Article 52. https://doi.org/10.1088/0004-637X/739/1/52

Dunkley, J, Hlozek, R, Sievers, J, Acquaviva, V, Ade, PAR, Aguirre, P, Amiri, M, Appel, JW, Barrientos, LF, Battistelli, ES, Bond, JR, Brown, B, Burger, B, Chervenak, J, Das, S, Devlin, MJ, Dicker, SR, Doriese, WB, Dünner, R, Essinger-Hileman, T, Fisher, RP, Fowler, JW, Hajian, A, Halpern, M, Hasselfield, M, Hernndez-Monteagudo, C, Hilton, GC, Hilton, M, Hincks, AD, Huffenberger, KM, Hughes, DH, Hughes, JP, Infante, L, Irwin, KD, Juin, JB, Kaul, M, Klein, J, Kosowsky, A, Lau, JM, Limon, M, Lin, YT, Lupton, RH, Marriage, TA, Marsden, D, Mauskopf, P, Menanteau, F, Moodley, K, Moseley, H, Netterfield, CB, Niemack, MD, Nolta, MR, Page, LA, Parker, L, Partridge, B, Reid, B, Sehgal, N, Sherwin, B, Spergel, DN, Staggs, ST, Swetz, DS, Switzer, ER, Thornton, R, Trac, H, Tucker, C, Warne, R, Wollack, E & Zhao, Y 2011, 'The atacama cosmology telescope: Cosmological parameters from the 2008 power spectrum', Astrophysical Journal, vol. 739, no. 1, 52. https://doi.org/10.1088/0004-637X/739/1/52

@article{48225fd616d84d159d3bfd59a612b658,

title = "The atacama cosmology telescope: Cosmological parameters from the 2008 power spectrum",

abstract = "We present cosmological parameters derived from the angular power spectrum of the cosmic microwave background (CMB) radiation observed at 148GHz and 218GHz over 296deg2 with the Atacama Cosmology Telescope (ACT) during its 2008 season. ACT measures fluctuations at scales 500 < ℓ < 10, 000. We fit a model for the lensed CMB, Sunyaev-Zel'dovich (SZ), and foreground contribution to the 148GHz and 218GHz power spectra, including thermal and kinetic SZ, Poisson power from radio and infrared point sources, and clustered power from infrared point sources. At ℓ = 3000, about half the power at 148GHz comes from primary CMB after masking bright radio sources. The power from thermal and kinetic SZ is estimated to be , where . The IR Poisson power at 148GHz is (C ℓ = 5.5 0.5 nK2), and a clustered IR component is required with , assuming an analytic model for its power spectrum shape. At 218GHz only about 15% of the power, approximately 27 μK 2, is CMB anisotropy at ℓ = 3000. The remaining 85% is attributed to IR sources (approximately 50% Poisson and 35% clustered), with spectral index α = 3.69 0.14 for flux scaling as S(ν)να. We estimate primary cosmological parameters from the less contaminated 148GHz spectrum, marginalizing over SZ and source power. The ΛCDM cosmological model is a good fit to the data (χ2/dof = 29/46), and ΛCDM parameters estimated from ACT+Wilkinson Microwave Anisotropy Probe (WMAP) are consistent with the seven-year WMAP limits, with scale invariant ns = 1 excluded at 99.7% confidence level (CL) (3σ). A model with no CMB lensing is disfavored at 2.8σ. By measuring the third to seventh acoustic peaks, and probing the Silk damping regime, the ACT data improve limits on cosmological parameters that affect the small-scale CMB power. The ACT data combined with WMAP give a 6σ detection of primordial helium, with Y P = 0.313 0.044, and a 4σ detection of relativistic species, assumed to be neutrinos, with N eff = 5.3 1.3 (4.6 0.8 with BAO+H 0 data). From the CMB alone the running of the spectral index is constrained to be dns /dln k = -0.034 0.018, the limit on the tensor-to-scalar ratio is r < 0.25 (95% CL), and the possible contribution of Nambu cosmic strings to the power spectrum is constrained to string tension Gμ < 1.6 × 10-7 (95% CL).",

keywords = "cosmic background radiation, cosmological parameters, cosmology: observations",

author = "J. Dunkley and R. Hlozek and J. Sievers and V. Acquaviva and Ade, {P. A.R.} and P. Aguirre and M. Amiri and Appel, {J. W.} and Barrientos, {L. F.} and Battistelli, {E. S.} and Bond, {J. R.} and B. Brown and B. Burger and J. Chervenak and S. Das and Devlin, {M. J.} and Dicker, {S. R.} and Doriese, {W. Bertrand} and R. D{\"u}nner and T. Essinger-Hileman and Fisher, {R. P.} and Fowler, {J. W.} and A. Hajian and M. Halpern and M. Hasselfield and C. Hernndez-Monteagudo and Hilton, {G. C.} and M. Hilton and Hincks, {A. D.} and Huffenberger, {K. M.} and Hughes, {D. H.} and Hughes, {J. P.} and L. Infante and Irwin, {K. D.} and Juin, {J. B.} and M. Kaul and J. Klein and A. Kosowsky and Lau, {J. M.} and M. Limon and Lin, {Y. T.} and Lupton, {R. H.} and Marriage, {T. A.} and D. Marsden and P. Mauskopf and F. Menanteau and K. Moodley and H. Moseley and Netterfield, {C. B.} and Niemack, {M. D.} and Nolta, {M. R.} and Page, {L. A.} and L. Parker and B. Partridge and B. Reid and N. Sehgal and B. Sherwin and Spergel, {D. N.} and Staggs, {S. T.} and Swetz, {D. S.} and Switzer, {E. R.} and R. Thornton and H. Trac and C. Tucker and R. Warne and E. Wollack and Y. Zhao",

year = "2011",

month = sep,

day = "20",

doi = "10.1088/0004-637X/739/1/52",

language = "English (US)",

volume = "739",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing Ltd.",

number = "1",

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TY - JOUR

T1 - The atacama cosmology telescope

T2 - Cosmological parameters from the 2008 power spectrum

AU - Dunkley, J.

AU - Hlozek, R.

AU - Sievers, J.

AU - Acquaviva, V.

AU - Ade, P. A.R.

AU - Aguirre, P.

AU - Amiri, M.

AU - Appel, J. W.

AU - Barrientos, L. F.

AU - Battistelli, E. S.

AU - Bond, J. R.

AU - Brown, B.

AU - Burger, B.

AU - Chervenak, J.

AU - Das, S.

AU - Devlin, M. J.

AU - Dicker, S. R.

AU - Doriese, W. Bertrand

AU - Dünner, R.

AU - Essinger-Hileman, T.

AU - Fisher, R. P.

AU - Fowler, J. W.

AU - Hajian, A.

AU - Halpern, M.

AU - Hasselfield, M.

AU - Hernndez-Monteagudo, C.

AU - Hilton, G. C.

AU - Hilton, M.

AU - Hincks, A. D.

AU - Huffenberger, K. M.

AU - Hughes, D. H.

AU - Hughes, J. P.

AU - Infante, L.

AU - Irwin, K. D.

AU - Juin, J. B.

AU - Kaul, M.

AU - Klein, J.

AU - Kosowsky, A.

AU - Lau, J. M.

AU - Limon, M.

AU - Lin, Y. T.

AU - Lupton, R. H.

AU - Marriage, T. A.

AU - Marsden, D.

AU - Mauskopf, P.

AU - Menanteau, F.

AU - Moodley, K.

AU - Moseley, H.

AU - Netterfield, C. B.

AU - Niemack, M. D.

AU - Nolta, M. R.

AU - Page, L. A.

AU - Parker, L.

AU - Partridge, B.

AU - Reid, B.

AU - Sehgal, N.

AU - Sherwin, B.

AU - Spergel, D. N.

AU - Staggs, S. T.

AU - Swetz, D. S.

AU - Switzer, E. R.

AU - Thornton, R.

AU - Trac, H.

AU - Tucker, C.

AU - Warne, R.

AU - Wollack, E.

AU - Zhao, Y.

PY - 2011/9/20

Y1 - 2011/9/20

N2 - We present cosmological parameters derived from the angular power spectrum of the cosmic microwave background (CMB) radiation observed at 148GHz and 218GHz over 296deg2 with the Atacama Cosmology Telescope (ACT) during its 2008 season. ACT measures fluctuations at scales 500 < ℓ < 10, 000. We fit a model for the lensed CMB, Sunyaev-Zel'dovich (SZ), and foreground contribution to the 148GHz and 218GHz power spectra, including thermal and kinetic SZ, Poisson power from radio and infrared point sources, and clustered power from infrared point sources. At ℓ = 3000, about half the power at 148GHz comes from primary CMB after masking bright radio sources. The power from thermal and kinetic SZ is estimated to be , where . The IR Poisson power at 148GHz is (C ℓ = 5.5 0.5 nK2), and a clustered IR component is required with , assuming an analytic model for its power spectrum shape. At 218GHz only about 15% of the power, approximately 27 μK 2, is CMB anisotropy at ℓ = 3000. The remaining 85% is attributed to IR sources (approximately 50% Poisson and 35% clustered), with spectral index α = 3.69 0.14 for flux scaling as S(ν)να. We estimate primary cosmological parameters from the less contaminated 148GHz spectrum, marginalizing over SZ and source power. The ΛCDM cosmological model is a good fit to the data (χ2/dof = 29/46), and ΛCDM parameters estimated from ACT+Wilkinson Microwave Anisotropy Probe (WMAP) are consistent with the seven-year WMAP limits, with scale invariant ns = 1 excluded at 99.7% confidence level (CL) (3σ). A model with no CMB lensing is disfavored at 2.8σ. By measuring the third to seventh acoustic peaks, and probing the Silk damping regime, the ACT data improve limits on cosmological parameters that affect the small-scale CMB power. The ACT data combined with WMAP give a 6σ detection of primordial helium, with Y P = 0.313 0.044, and a 4σ detection of relativistic species, assumed to be neutrinos, with N eff = 5.3 1.3 (4.6 0.8 with BAO+H 0 data). From the CMB alone the running of the spectral index is constrained to be dns /dln k = -0.034 0.018, the limit on the tensor-to-scalar ratio is r < 0.25 (95% CL), and the possible contribution of Nambu cosmic strings to the power spectrum is constrained to string tension Gμ < 1.6 × 10-7 (95% CL).

AB - We present cosmological parameters derived from the angular power spectrum of the cosmic microwave background (CMB) radiation observed at 148GHz and 218GHz over 296deg2 with the Atacama Cosmology Telescope (ACT) during its 2008 season. ACT measures fluctuations at scales 500 < ℓ < 10, 000. We fit a model for the lensed CMB, Sunyaev-Zel'dovich (SZ), and foreground contribution to the 148GHz and 218GHz power spectra, including thermal and kinetic SZ, Poisson power from radio and infrared point sources, and clustered power from infrared point sources. At ℓ = 3000, about half the power at 148GHz comes from primary CMB after masking bright radio sources. The power from thermal and kinetic SZ is estimated to be , where . The IR Poisson power at 148GHz is (C ℓ = 5.5 0.5 nK2), and a clustered IR component is required with , assuming an analytic model for its power spectrum shape. At 218GHz only about 15% of the power, approximately 27 μK 2, is CMB anisotropy at ℓ = 3000. The remaining 85% is attributed to IR sources (approximately 50% Poisson and 35% clustered), with spectral index α = 3.69 0.14 for flux scaling as S(ν)να. We estimate primary cosmological parameters from the less contaminated 148GHz spectrum, marginalizing over SZ and source power. The ΛCDM cosmological model is a good fit to the data (χ2/dof = 29/46), and ΛCDM parameters estimated from ACT+Wilkinson Microwave Anisotropy Probe (WMAP) are consistent with the seven-year WMAP limits, with scale invariant ns = 1 excluded at 99.7% confidence level (CL) (3σ). A model with no CMB lensing is disfavored at 2.8σ. By measuring the third to seventh acoustic peaks, and probing the Silk damping regime, the ACT data improve limits on cosmological parameters that affect the small-scale CMB power. The ACT data combined with WMAP give a 6σ detection of primordial helium, with Y P = 0.313 0.044, and a 4σ detection of relativistic species, assumed to be neutrinos, with N eff = 5.3 1.3 (4.6 0.8 with BAO+H 0 data). From the CMB alone the running of the spectral index is constrained to be dns /dln k = -0.034 0.018, the limit on the tensor-to-scalar ratio is r < 0.25 (95% CL), and the possible contribution of Nambu cosmic strings to the power spectrum is constrained to string tension Gμ < 1.6 × 10-7 (95% CL).

KW - cosmic background radiation

KW - cosmological parameters

KW - cosmology: observations

UR - http://www.scopus.com/inward/record.url?scp=80053535378&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=80053535378&partnerID=8YFLogxK

U2 - 10.1088/0004-637X/739/1/52

DO - 10.1088/0004-637X/739/1/52

M3 - Article

AN - SCOPUS:80053535378

SN - 0004-637X

VL - 739

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

M1 - 52

ER -

The atacama cosmology telescope: Cosmological parameters from the 2008 power spectrum

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