Publications by Maximilian Abitbol


The Atacama Cosmology Telescope: DR4 maps and cosmological parameters

Journal of Cosmology and Astroparticle Physics IOP Publishing 2020 (2020) 047

E Calabrese, L Maurin, S Naess, MH Abitbol, GE Addison, JE Austermann, R Bean, DT Becker, SM Bruno, V Calafut, F Carrero, GE Chesmore, H-M Cho, SK Choi, SE Clark, NF Cothard, D Crichton, KT Crowley, O Darwish, R Datta, EV Denison, MJ Devlin, SM Duff, AJ Duivenvoorden, T Essinger-Hileman

<p>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&ndash;2016 at 98 and 150 GHz. The maps cover more than 17,000 deg<sup>2</sup>, the deepest 600 deg<sup>2</sup>&nbsp;with noise levels below&nbsp;10&mu;K-arcmin. We use the power spectrum derived from almost 6,000 deg<sup>2</sup>&nbsp;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,&nbsp;<em>H</em><sub>0</sub>. By combining ACT data with large-scale information from&nbsp;<em>WMAP</em>&nbsp;we measure&nbsp;<em>H</em><sub>0</sub>=67.6&plusmn;&nbsp;1.1&nbsp;km/s/Mpc, at 68% confidence, in excellent agreement with the independently-measured&nbsp;<em>Planck</em>&nbsp;satellite estimate (from ACT alone we find&nbsp;<em>H</em><sub>0</sub>=67.9&plusmn;&nbsp;1.5&nbsp;km/s/Mpc). The&nbsp;&Lambda;CDM model provides a good fit to the ACT data, and we find no evidence for deviations: both the spatial curvature, and the departure from the standard lensing signal in the spectrum, are zero to within 1&sigma;; the number of relativistic species, the primordial Helium fraction, and the running of the spectral index are consistent with&nbsp;&Lambda;CDM predictions to within 1.5&ndash;2.2&sigma;. We compare ACT,&nbsp;<em>WMAP</em>, and&nbsp;<em>Planck</em>&nbsp;at the parameter level and find good consistency; we investigate how the constraints on the correlated spectral index and baryon density parameters readjust when adding CMB large-scale information that ACT does not measure. The DR4 products presented here will be publicly released on the NASA Legacy Archive for Microwave Background Data Analysis.</p>


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