articleJournal of Cosmology and Astroparticle PhysicsNov 1, 2025HYBRID OA

The Atacama Cosmology Telescope: DR6 power spectra, likelihoods and ΛCDM parameters

TLThibaut LouisALAdrien La PostaZAZachary AtkinsHTHidde T. JenseIAIrene Abril-Cabezas

Laboratoire de Physique des 2 Infinis Irène Joliot-Curie · Science Oxford · +57 more institutions

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Abstract

Abstract We present power spectra of the cosmic microwave background (CMB) anisotropy in temperature and polarization, measured from the Data Release 6 maps made from Atacama Cosmology Telescope (ACT) data. These cover 19,000 deg 2 of sky in bands centered at 98, 150 and 220 GHz, with white noise levels three times lower than Planck in polarization. We find that the ACT angular power spectra estimated over 10,000 deg 2 , and measured to arcminute scales in TT, TE and EE, are well fit by the sum of CMB and foregrounds, where the CMB spectra are described by the ΛCDM model. Combining ACT with larger-scale Planck data, the joint P-ACT dataset provides tight limits on the ingredients, expansion rate, and initial…

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Topics & keywords

Topics
Keywords
  • Cosmic microwave background
  • Baryon acoustic oscillations
  • Cosmology
  • Spectral density
  • Dark energy
  • Hubble's law
  • Spectral index
  • Spectral line
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