The Atacama Cosmology Telescope: delensed power spectra and parameters,Journal of Cosmology and Astroparticle Physics

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The Atacama Cosmology Telescope: delensed power spectra and parameters
Journal of Cosmology and Astroparticle Physics ( IF 5.3 ) Pub Date : 2021-01-18 , DOI: 10.1088/1475-7516/2021/01/031
Dongwon Han _{1,

2} , Neelima Sehgal _{1,

2} , Amanda MacInnis ₁ , Alexander van Engelen ₃ , Blake D. Sherwin _{4,

5} , Mathew S. Madhavacheril _{6,

7} , Simone Aiola ₂ , Nicholas Battaglia ₈ , James A. Beall ₉ , Daniel T. Becker ₉ , Erminia Calabrese ₁₀ , Steve K. Choi _{8,

11} , Omar Darwish ₄ , Edward V. Denison ₉ , Mark J. Devlin ₁₂ , Jo Dunkley _{7,

13} , Simone Ferraro _{14,

15} , Anna E. Fox ₉ , Matthew Hasselfield _{2,

16,

17} , J. Colin Hill _{2,

18} , Gene C. Hilton ₉ , Matt Hilton ₁₉ , Renée Hlo&zcaron;ek _{20,

21} , Johannes Hubmayr ₉ , John P. Hughes ₂₂ , Arthur Kosowsky ₂₃ , Jeff Van Lanen ₉ , Thibaut Louis ₂₄ , Kavilan Moodley ₁₉ , Sigurd Naess ₂ , Toshiya Namikawa ₄ , Federico Nati ₂₅ , John P. Nibarger ₉ , Michael D. Niemack _{8,

11} , Lyman A. Page ₁₃ , Bruce Partridge ₂₆ , Frank J. Qu ₄ , Alessandro Schillaci ₂₇ , David N. Spergel _{2,

7} , Suzanne Staggs ₁₃ , Emilie Storer ₁₃ , Edward J. Wollack ₂₈

Affiliation

Physics and Astronomy Department, Stony Brook University, Stony Brook, NY 11794, U.S.A.
Center for Computational Astrophysics, Flatiron Institute, 162 5th Avenue, New York, NY 10010, U.S.A.
School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287, U.S.A.
Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA, U.K.
Kavli Institute for Cosmology, University of Cambridge, Madingley Road, Cambridge CB3 OHA, U.K.
Centre for the Universe, Perimeter Institute for Theoretical Physics, Waterloo, ON, N2L 2Y5, Canada
Department of Astrophysical Sciences, Princeton University, 4 Ivy Lane, Princeton, NJ 08544, U.S.A.
Department of Astronomy, Cornell University, Ithaca, NY 14853, U.S.A.
NIST Quantum Devices Group, 325 Broadway Mailcode 817.03, Boulder, CO 80305, U.S.A.
School of Physics and Astronomy, Cardiff University, The Parade, Cardiff, Wales, CF24 3AA, U.K.
Department of Physics, Cornell University, Ithaca, NY 14853, U.S.A.
Department of Physics and Astronomy, University of Pennsylvania, 209 South 33rd Street, Philadelphia, PA 19104, U.S.A.
Joseph Henry Laboratories of Physics, Jadwin Hall, Princeton University, Princeton, NJ 08544, U.S.A.
Berkeley Center for Cosmological Physics, Department of Physics, University of California, Berkeley, CA 94720, U.S.A.
Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, CA 94720, U.S.A.
Department of Astronomy and Astrophysics, The Pennsylvania State University, University Park, PA 16802, U.S.A.
Institute for Gravitation and the Cosmos, The Pennsylvania State University, University Park, PA 16802, U.S.A.
Department of Physics, Columbia University, New York, NY 10027, U.S.A.
Astrophysics Research Centre, School of Mathematics, Statistics & Computer Science, University of KwaZulu-Natal, Westville Campus, Durban 4041, South Africa
David A. Dunlap Department of Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto, ON M5S3H4, Canada
Dunlap Institute for Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto, ON M5S3H4, Canada
Department of Physics and Astronomy, Rutgers, The State University of New Jersey, Piscataway, NJ 08854-8019, U.S.A.
Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260, U.S.A.
Laboratoire de l'Accélérateur Linéaire, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, France
Department of Physics, University of Milano-Bicocca, Piazza della Scienza, 3, 20126, Milano (MI), Italy
Department of Physics and Astronomy, Haverford College, Haverford, PA 19041, U.S.A.
Department of Physics, California Institute of Technology, Pasadena, California 91125, U.S.A.
NASA/Goddard Space Flight Center, Greenbelt, MD 20771, U.S.A.

We present ΛCDM cosmological parameter constraints obtained from delensed microwave background power spectra. Lensing maps from a subset of DR4 data from the Atacama Cosmology Telescope (ACT) are used to undo the lensing effect in ACT spectra observed at 150 and 98 GHz. At 150 GHz, we remove the lensing distortion with an effective efficiency of 30% (TT), 30% (EE), 26% (TE) and 20% (BB); this results in detections of the delensing effect at 8.7σ (TT), 5.1σ (EE), 2.6σ (TE), and 2.4σ (BB) significance. The combination of 150 and 98 GHz TT, EE, and TE delensed spectra is well fit by a standard ΛCDM model. We also measure the shift in best-fit parameters when fitting delensed versus lensed spectra; while this shift does not inform our ability to measure cosmological parameters, it does provide a three-way consistency check among the lensing inferred from the best-fit parameters, the lensing in the CMB power spectrum, and the reconstructed lensing map. This shift is predicted to be zero when fitting with the correct model since both lensed and delensed spectra originate from the same region of sky. Fitting with a ΛCDM model and marginalizing over foregrounds, we find that the shift in cosmological parameters is consistent with zero. Our results show that gravitational lensing of the microwave background is internally consistent within the framework of the standard cosmological model.

中文翻译：

阿塔卡马宇宙望远镜：降功率谱和参数

我们提出 ΛCDM宇宙学参数约束条件是从消隐的微波背景功率谱获得的。来自阿塔卡马宇宙望远镜（ACT）的DR4数据子集的透镜图用于消除在150 GHz和98 GHz观察到的ACT光谱中的透镜效应。在150 GHz频率下，我们以30％（TT），30％（EE），26％（TE）和20％（BB）的有效效率消除了镜头畸变；这导致检测到显着性效应分别为8.7σ（TT），5.1σ（EE），2.6σ（TE）和2.4σ（BB）。150和98 GHz TT，EE和TE的组合标准ΛCDM模型很好地拟合了脱镜光谱。我们还测量了将脱光光谱与透镜光谱进行拟合时，最佳拟合参数的变化；虽然这种变化并不能说明我们测量宇宙学参数的能力，但它确实提供了从最佳拟合参数，CMB功率谱中的透镜和重构的透镜图推断出的透镜之间的三向一致性检查。当拟合正确的模型时，此偏移量预计为零，因为透镜化的透镜和去角质的光谱都来自同一天空区域。拟合ΛCDM模型并在前景上边缘化，我们发现宇宙学参数的偏移与零一致。我们的结果表明，在标准宇宙学模型的框架内，微波背景的引力透镜在内部是一致的。

更新日期：2021-01-18

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