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Precision epoch of reionization studies with next-generation CMB experiments

Calabrese, Erminia ORCID:, Hlozek, Renée, Battaglia, Nick, Bond, J. Richard, de Bernardis, Francesco, Devlin, Mark J., Hajian, Amir, Henderson, Shawn, Hil, J. Colin, Kosowsky, Arthur, Louis, Thibaut, McMahon, Jeff, Moodley, Kavilan, Newburgh, Laura, Niemack, Michael D., Page, Lyman A., Partridge, Bruce, Sehgal, Neelima, Sievers, Jonathan L., Spergel, David N., Staggs, Suzanne T., Switzer, Eric R., Trac, Hy and Wollack, Edward J. 2014. Precision epoch of reionization studies with next-generation CMB experiments. Journal of Cosmology and Astroparticle Physics 2014 (08) , 010. 10.1088/1475-7516/2014/08/010

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Future arcminute resolution polarization data from ground-based Cosmic Microwave Background (CMB) observations can be used to estimate the contribution to the temperature power spectrum from the primary anisotropies and to uncover the signature of reionization near ℓ=1500 in the small angular-scale temperature measurements. Our projections are based on combining expected small-scale E-mode polarization measurements from Advanced ACTPol in the range 300<ℓ<3000 with simulated temperature data from the full Planck mission in the low and intermediate ℓ region, 2<ℓ<2000. We show that the six basic cosmological parameters determined from this combination of data will predict the underlying primordial temperature spectrum at high multipoles to better than 1% accuracy. Assuming an efficient cleaning from multi-frequency channels of most foregrounds in the temperature data, we investigate the sensitivity to the only residual secondary component, the kinematic Sunyaev-Zel'dovich (kSZ) term. The CMB polarization is used to break degeneracies between primordial and secondary terms present in temperature and, in effect, to remove from the temperature data all but the residual kSZ term. We estimate a 15σ detection of the diffuse homogeneous kSZ signal from expected AdvACT temperature data at ℓ>1500, leading to a measurement of the amplitude of matter density fluctuations, σ8, at 1% precision. Alternatively, by exploring the reionization signal encoded in the patchy kSZ measurements, we bound the time and duration of the reionization with σ(zre)=1.1 and σ(Δzre)=0.2. We find that these constraints degrade rapidly with large beam sizes, which highlights the importance of arcminute-scale resolution for future CMB surveys.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: IOP Publishing
ISSN: 1475-7516
Date of First Compliant Deposit: 7 September 2017
Date of Acceptance: 10 July 2014
Last Modified: 09 Nov 2023 23:44

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