1. The Atacama Cosmology Telescope: Delensed power spectra and parameters
- Author
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Johannes Hubmayr, Dongwon Han, Bruce Partridge, Lyman A. Page, Emilie Storer, Simone Aiola, Sigurd Naess, Edward V. Denison, Mark J. Devlin, Anna E. Fox, Arthur Kosowsky, J. Colin Hill, Omar Darwish, Amanda MacInnis, Nicholas Battaglia, Matthew Hasselfield, Mathew S. Madhavacheril, John P. Nibarger, Gene C. Hilton, Thibaut Louis, Federico Nati, Edward J. Wollack, Blake D. Sherwin, Neelima Sehgal, Simone Ferraro, Renée Hložek, John P. Hughes, Michael D. Niemack, Daniel T. Becker, Steve K. Choi, Frank J. Qu, Suzanne T. Staggs, David N. Spergel, Kavilan Moodley, Matt Hilton, Alexander van Engelen, James A. Beall, Alessandro Schillaci, Toshiya Namikawa, Erminia Calabrese, Jo Dunkley, Jeff Van Lanen, Han, D, Sehgal, N, Macinnis, A, van Engelen, A, Sherwin, B, Madhavacheril, M, Aiola, S, Battaglia, N, Beall, J, Becker, D, Calabrese, E, Choi, S, Darwish, O, Denison, E, Devlin, M, Dunkley, J, Ferraro, S, Fox, A, Hasselfield, M, Colin Hill, J, Hilton, G, Hilton, M, Hlozek, R, Hubmayr, J, Hughes, J, Kosowsky, A, van Lanen, J, Louis, T, Moodley, K, Naess, S, Namikawa, T, Nati, F, Nibarger, J, Niemack, M, Page, L, Partridge, B, Qu, F, Schillaci, A, Spergel, D, Staggs, S, Storer, E, Wollack, E, Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and ACT
- Subjects
cosmological model ,Cosmology and Nongalactic Astrophysics (astro-ph.CO) ,media_common.quotation_subject ,Cosmic microwave background ,FOS: Physical sciences ,Lambda-CDM model ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,weak gravitational lensing ,01 natural sciences ,Atomic ,Spectral line ,microwaves: background ,High Energy Physics - Phenomenology (hep-ph) ,Particle and Plasma Physics ,statistical analysis ,gravitation: lens ,0103 physical sciences ,Nuclear ,cosmic background radiation: power spectrum ,Weak gravitational lensing ,010303 astronomy & astrophysics ,media_common ,Physics ,010308 nuclear & particles physics ,Spectral density ,cosmological parameters from CMBR ,Molecular ,Astronomy and Astrophysics ,hep-ph ,Nuclear & Particles Physics ,Cosmological parameters from CMBR ,High Energy Physics - Phenomenology ,Gravitational lens ,background: power spectrum ,Sky ,[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph] ,Atacama Cosmology Telescope ,astro-ph.CO ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] ,Astronomical and Space Sciences ,Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
We present LCDM 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 8.7 sigma (TT), 5.1 sigma (EE), 2.6 sigma (TE), and 2.4 sigma (BB) significance. The combination of 150 and 98 GHz TT, EE, and TE delensed spectra is well fit by a standard LCDM 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 LCDM 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., 29 pages, 17 figures, version matches that accepted by JCAP
- Published
- 2021
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