The Atacama Cosmology Telescope: Two-Season ACTPol Spectra and Parameters
2017
We present the temperature and polarization angular power spectra measured by the Atacama Cosmology
Telescope Polarimeter (ACTPol). We analyze night-time data collected during 2013{14 using
two detector arrays at 149 GHz, from 548 deg2 of sky on the celestial equator. We use these spectra,
and the spectra measured with the MBAC camera on ACT from 2008{10, in combination with
Planck and WMAP data to estimate cosmological parameters from the temperature, polarization,
and temperature-polarization cross-correlations. We �nd the new ACTPol data to be consistent with
the �CDM model. The ACTPol temperature-polarization cross-spectrum now provides stronger constraints
on multiple parameters than the ACTPol temperature spectrum, including the baryon density,
the acoustic peak angular scale, and the derived Hubble constant. The new ACTPol data provide
information on damping tail parameters. The joint uncertainty on the number of neutrino species and
the primordial helium fraction is reduced by 20% when adding ACTPol to Planck temperature data
alone.
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