The Atacama Cosmology Telescope: A Measurement of the DR6 CMB Lensing Power Spectrum and Its Implications for Structure Growth
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Published:2024-02-01
Issue:2
Volume:962
Page:112
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ISSN:0004-637X
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Container-title:The Astrophysical Journal
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language:
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Short-container-title:ApJ
Author:
Qu Frank J., Sherwin Blake D., Madhavacheril Mathew S.ORCID, Han Dongwon, Crowley Kevin T., Abril-Cabezas IreneORCID, Ade Peter A. R., Aiola SimoneORCID, Alford Tommy, Amiri Mandana, Amodeo Stefania, An Rui, Atkins Zachary, Austermann Jason E.ORCID, Battaglia NicholasORCID, Battistelli Elia StefanoORCID, Beall James A., Bean Rachel, Beringue Benjamin, Bhandarkar TanayORCID, Biermann Emily, Bolliet Boris, Bond J Richard, Cai Hongbo, Calabrese Erminia, Calafut Victoria, Capalbo Valentina, Carrero Felipe, Carron Julien, Challinor Anthony, Chesmore Grace E., Cho Hsiao-mei, Choi Steve K.ORCID, Clark Susan E.ORCID, Córdova Rosado Rodrigo, Cothard Nicholas F., Coughlin Kevin, Coulton WilliamORCID, Dalal Roohi, Darwish Omar, Devlin Mark J., Dicker SimonORCID, Doze PeterORCID, Duell Cody J., Duff Shannon M., Duivenvoorden Adriaan J.ORCID, Dunkley JoORCID, Dünner RolandoORCID, Fanfani Valentina, Fankhanel Max, Farren GerritORCID, Ferraro Simone, Freundt Rodrigo, Fuzia Brittany, Gallardo Patricio A., Garrido Xavier, Gluscevic Vera, Golec Joseph E., Guan YilunORCID, Halpern MarkORCID, Harrison Ian, Hasselfield Matthew, Healy Erin, Henderson Shawn, Hensley BrandonORCID, Hervías-Caimapo Carlos, Hill J. Colin, Hilton Gene C., Hilton MattORCID, Hincks Adam D.ORCID, Hložek Renée, Ho Shuay-Pwu Patty, Huber Zachary B., Hubmayr Johannes, Huffenberger Kevin M.ORCID, Hughes John P.ORCID, Irwin Kent, Isopi GiovanniORCID, Jense Hidde T., Keller Ben, Kim Joshua, Knowles KendaORCID, Koopman Brian J., Kosowsky ArthurORCID, Kramer Darby, Kusiak Aleksandra, La Posta Adrien, Lague Alex, Lakey Victoria, Lee Eunseong, Li Zack, Li Yaqiong, Limon Michele, Lokken Martine, Louis Thibaut, Lungu Marius, MacCrann Niall, MacInnis Amanda, Maldonado Diego, Maldonado Felipe, Mallaby-Kay Maya, Marques Gabriela A., McMahon Jeff, Mehta Yogesh, Menanteau FelipeORCID, Moodley KavilanORCID, Morris Thomas W., Mroczkowski TonyORCID, Naess SigurdORCID, Namikawa Toshiya, Nati Federico, Newburgh Laura, Nicola Andrina, Niemack Michael D., Nolta Michael R., Orlowski-Scherer JohnORCID, Page Lyman A.ORCID, Pandey Shivam, Partridge Bruce, Prince Heather, Puddu Roberto, Radiconi Federico, Robertson Naomi, Rojas Felipe, Sakuma Tai, Salatino Maria, Schaan EmmanuelORCID, Schmitt Benjamin L., Sehgal NeelimaORCID, Shaikh Shabbir, Sierra Carlos, Sievers Jon, Sifón Cristóbal, Simon Sara, Sonka Rita, Spergel David N.ORCID, Staggs Suzanne T., Storer Emilie, Switzer Eric R., Tampier Niklas, Thornton Robert, Trac Hy, Treu Jesse, Tucker Carole, Ullom Joel, Vale Leila R., Van Engelen Alexander, Van Lanen Jeff, van Marrewijk Joshiwa, Vargas Cristian, Vavagiakis Eve M., Wagoner Kasey, Wang Yuhan, Wenzl LukasORCID, Wollack Edward J.ORCID, Xu ZhileiORCID, Zago Fernando, Zheng Kaiwen
Abstract
Abstract
We present new measurements of cosmic microwave background (CMB) lensing over 9400 deg2 of the sky. These lensing measurements are derived from the Atacama Cosmology Telescope (ACT) Data Release 6 (DR6) CMB data set, which consists of five seasons of ACT CMB temperature and polarization observations. We determine the amplitude of the CMB lensing power spectrum at 2.3% precision (43σ significance) using a novel pipeline that minimizes sensitivity to foregrounds and to noise properties. To ensure that our results are robust, we analyze an extensive set of null tests, consistency tests, and systematic error estimates and employ a blinded analysis framework. Our CMB lensing power spectrum measurement provides constraints on the amplitude of cosmic structure that do not depend on Planck or galaxy survey data, thus giving independent information about large-scale structure growth and potential tensions in structure measurements. The baseline spectrum is well fit by a lensing amplitude of A
lens = 1.013 ± 0.023 relative to the Planck 2018 CMB power spectra best-fit ΛCDM model and A
lens = 1.005 ± 0.023 relative to the ACT DR4 + WMAP best-fit model. From our lensing power spectrum measurement, we derive constraints on the parameter combination
S
8
CMBL
≡
σ
8
Ω
m
/
0.3
0.25
of
S
8
CMBL
=
0.818
±
0.022
from ACT DR6 CMB lensing alone and
S
8
CMBL
=
0.813
±
0.018
when combining ACT DR6 and Planck NPIPE CMB lensing power spectra. These results are in excellent agreement with ΛCDM model constraints from Planck or ACT DR4 + WMAP CMB power spectrum measurements. Our lensing measurements from redshifts z ∼ 0.5–5 are thus fully consistent with ΛCDM structure growth predictions based on CMB anisotropies probing primarily z ∼ 1100. We find no evidence for a suppression of the amplitude of cosmic structure at low redshifts.
Funder
U.S. National science foundation
Publisher
American Astronomical Society
Cited by
36 articles.
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