Cardiff University | Prifysgol Caerdydd ORCA
Online Research @ Cardiff 
WelshClear Cookie - decide language by browser settings

The Atacama Cosmology Telescope: CMB polarization at 200 < ℓ < 9000

Naess, S., Hasselfield, M., McMahon, j., Addison, G.E., Ade, Peter, Allison, R., Amiri, M., Battaglia, N., Beall, J., Bernardis, F., Bond, R.J., Britton, J., Calabrese, Erminia, Cho, H., Coughlin, K, Niemack, M.D., Crichton, D., Das, S., Datta, R., Devlin, M.J, Dicker, S.R., Dunkley, J., Dünner, R., Fowler, J.W., Fox, A.E., Gallardo, P., Grace, E., Gralla, M., Hajian, A., Halpern, M., Henderson, S., Hill, C.J., Hilton, G.C., Hilton, M., Hincks, A.D., Hlozek, R., Ho, P., Hubmayr, J., Huffenberger, K.M., Hughes, J.P., Infante, L., Irwin, K., Jackson, R., Kasanda, S.M., Klein, J., Koopman, B., Kosowsky, A., Louis, T., Li, D., Lungu, M., Madhavacheril, M., Marriage, T.A., Maurin, L., Menanteau, F., Moodley, K., Munson, C., Newburgh, L., Nibarger, J., Nolta, M.R., Page, L. A., Pappas, C., Partridge, B., Rojas, F., Schmitt, B.L., Sehgal, N., Sherwin, D., Sievers, J., Simon, S., Spergel2, D.N., Staggs, S.T, Switzer, E.R., Thornton, R., Trac, H., Tucker, Carole, Uehara, M., Van Engelen, A., Ward, J.T. and Wollack, E.J. 2014. The Atacama Cosmology Telescope: CMB polarization at 200 < ℓ < 9000. Journal of Cosmology and Astroparticle Physics 2014 10.1088/1475-7516/2014/10/007

[img]
Preview
PDF - Submitted Pre-Print Version
Download (8MB) | Preview

Abstract

We report on measurements of the cosmic microwave background (CMB) and celestial polarization at 146 GHz made with the Atacama Cosmology Telescope Polarimeter (ACTPol) in its first three months of observing. Four regions of sky covering a total of 270 square degrees were mapped with an angular resolution of 1.3'. The map noise levels in the four regions are between 11 and 17 μK-arcmin. We present TT, TE, EE, TB, EB, and BB power spectra from three of these regions. The observed E-mode polarization power spectrum, displaying six acoustic peaks in the range 200 < ℓ < 3000, is an excellent fit to the prediction of the best-fit cosmological models from WMAP9+ACT and Planck data. The polarization power spectrum, which mainly reflects primordial plasma velocity perturbations, provides an independent determination of cosmological parameters consistent with those based on the temperature power spectrum, which results mostly from primordial density perturbations. We find that without masking any point sources in the EE data at ℓ < 9000, the Poisson tail of the EE power spectrum due to polarized point sources has an amplitude less than 2.4 μ 2 at ℓ = 3000 at 95% confidence. Finally, we report that the Crab Nebula, an important polarization calibration source at microwave frequencies, has 8.7% polarization with an angle of 150.7o ± 0.6o when smoothed with a 5' Gaussian beam.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Publisher: IOP
ISSN: 1475-7516
Date of Acceptance: 20 September 2014
Last Modified: 01 Jul 2019 09:19
URI: http://orca-mwe.cf.ac.uk/id/eprint/102447

Citation Data

Cited 99 times in Scopus. View in Scopus. Powered By Scopus® Data

Actions (repository staff only)

Edit Item Edit Item

Downloads

Downloads per month over past year

View more statistics