학술논문

The Atacama Cosmology Telescope: A Measurement of the DR6 CMB Lensing Power Spectrum and Its Implications for Structure Growth
Document Type
article
Author
Frank J. QuBlake D. SherwinMathew S. MadhavacherilDongwon HanKevin T. CrowleyIrene Abril-CabezasPeter A. R. AdeSimone AiolaTommy AlfordMandana AmiriStefania AmodeoRui AnZachary AtkinsJason E. AustermannNicholas BattagliaElia Stefano BattistelliJames A. BeallRachel BeanBenjamin BeringueTanay BhandarkarEmily BiermannBoris BollietJ Richard BondHongbo CaiErminia CalabreseVictoria CalafutValentina CapalboFelipe CarreroJulien CarronAnthony ChallinorGrace E. ChesmoreHsiao-mei ChoSteve K. ChoiSusan E. ClarkRodrigo Córdova RosadoNicholas F. CothardKevin CoughlinWilliam CoultonRoohi DalalOmar DarwishMark J. DevlinSimon DickerPeter DozeCody J. DuellShannon M. DuffAdriaan J. DuivenvoordenJo DunkleyRolando DünnerValentina FanfaniMax FankhanelGerrit FarrenSimone FerraroRodrigo FreundtBrittany FuziaPatricio A. GallardoXavier GarridoVera GluscevicJoseph E. GolecYilun GuanMark HalpernIan HarrisonMatthew HasselfieldErin HealyShawn HendersonBrandon HensleyCarlos Hervías-CaimapoJ. Colin HillGene C. HiltonMatt HiltonAdam D. HincksRenée HložekShuay-Pwu Patty HoZachary B. HuberJohannes HubmayrKevin M. HuffenbergerJohn P. HughesKent IrwinGiovanni IsopiHidde T. JenseBen KellerJoshua KimKenda KnowlesBrian J. KoopmanArthur KosowskyDarby KramerAleksandra KusiakAdrien La PostaAlex LagueVictoria LakeyEunseong LeeZack LiYaqiong LiMichele LimonMartine LokkenThibaut LouisMarius LunguNiall MacCrannAmanda MacInnisDiego MaldonadoFelipe MaldonadoMaya Mallaby-KayGabriela A. MarquesJeff McMahonYogesh MehtaFelipe MenanteauKavilan MoodleyThomas W. MorrisTony MroczkowskiSigurd NaessToshiya NamikawaFederico NatiLaura NewburghAndrina NicolaMichael D. NiemackMichael R. NoltaJohn Orlowski-SchererLyman A. PageShivam PandeyBruce PartridgeHeather PrinceRoberto PudduFederico RadiconiNaomi RobertsonFelipe RojasTai SakumaMaria SalatinoEmmanuel SchaanBenjamin L. SchmittNeelima SehgalShabbir ShaikhCarlos SierraJon SieversCristóbal SifónSara SimonRita SonkaDavid N. SpergelSuzanne T. StaggsEmilie StorerEric R. SwitzerNiklas TampierRobert ThorntonHy TracJesse TreuCarole TuckerJoel UllomLeila R. ValeAlexander Van EngelenJeff Van LanenJoshiwa van MarrewijkCristian VargasEve M. VavagiakisKasey WagonerYuhan WangLukas WenzlEdward J. WollackZhilei XuFernando ZagoKaiwen Zheng
Source
The Astrophysical Journal, Vol 962, Iss 2, p 112 (2024)
Subject
Cosmological parameters
Cosmological parameters from large-scale structure
Astrophysics
QB460-466
Language
English
ISSN
1538-4357
Abstract
We present new measurements of cosmic microwave background (CMB) lensing over 9400 deg ^2 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 (43 σ 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 ${S}_{8}^{\mathrm{CMBL}}\equiv {\sigma }_{8}{\left({{\rm{\Omega }}}_{m}/0.3\right)}^{0.25}$ of ${S}_{8}^{\mathrm{CMBL}}=0.818\pm 0.022$ from ACT DR6 CMB lensing alone and ${S}_{8}^{\mathrm{CMBL}}=0.813\pm 0.018$ 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.