articleJournal of Cosmology and Astroparticle PhysicsDec 1, 2020GREEN OA

The Atacama Cosmology Telescope: DR4 maps and cosmological parameters

SASimone AiolaECErminia CalabreseLMLoïc MaurinSNSigurd NaessBLBenjamin L. Schmitt
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Abstract

We present new arcminute-resolution maps of the Cosmic Microwave Background temperature and polarization anisotropy from the Atacama Cosmology Telescope, using data taken from 2013–2016 at 98 and 150 GHz. The maps cover more than 17,000 deg 2 , the deepest 600 deg 2 with noise levels below 10μK-arcmin. We use the power spectrum derived from almost 6,000 deg 2 of these maps to constrain cosmology. The ACT data enable a measurement of the angular scale of features in both the divergence-like polarization and the temperature anisotropy, tracing both the velocity and density at last-scattering. From these one can derive the distance to the last-scattering surface and thus infer the local expansion rate, H 0 . By…

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Authors

141
  • SA
    Simone AiolaCorresponding
  • EC
    Erminia Calabrese
  • LM
    Loïc Maurin
  • SN
    Sigurd Naess
  • BL
    Benjamin L. Schmitt

Topics & keywords

Topics
Keywords
  • Cosmic microwave background
  • Cosmology
  • Spectral index
  • Spectral density
  • Polarization (electrochemistry)
  • Anisotropy
  • Observational cosmology
  • Cosmic background radiation
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