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Characterization of the Millimeter-Wave Polarization of Centaurus A with QUaD
Zemcov M., Ade P., Bock J., Bowden M., Brown M.L. et al
Astrophysical Journal 710 (2010) 1541-1550 - http://hal.archives-ouvertes.fr/hal-00736905
Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique
Characterization of the Millimeter-Wave Polarization of Centaurus A with QUaD
M. Zemcov, P. Ade, J. Bock, M. Bowden, M. L. Brown, G. Cahill, P. G. Castro, S. Church, T. Culverhouse, R. B. Friedman, K. Ganga1, W. K. Gear, S. Gupta, J. Hinderks, J. Kovac, A. E. Lange, E. Leitch, S. J. Melhuish, Y. Memari, J. A. Murphy, A. Orlando, C. O'Sullivan, L. Piccirillo, C. Pryke, N. Rajguru, B. Rusholme, R. Schwarz, A. N. Taylor, K. L. Thompson, A. H. Turner, E. Y. S. Wu
1 :  APC - UMR 7164 - AstroParticule et Cosmologie
CNRS : UMR7164 – IN2P3 – Observatoire de Paris – Université Paris VII - Paris Diderot – CEA : DSM/IRFU
APC - UMR 7164, Université Paris Diderot, 10 rue Alice Domon et Léonie Duquet, case postale 7020, F-75205 Paris Cedex 13
APC - Cosmologie et Gravitation
Centaurus (Cen) A represents one of the best candidates for an isolated, compact, highly polarized source that is bright at typical cosmic microwave background (CMB) experiment frequencies. We present measurements of the 4° × 2° region centered on Cen A with QUaD, a CMB polarimeter whose absolute polarization angle is known to an accuracy of 0fdg5. Simulations are performed to assess the effect of misestimation of the instrumental parameters on the final measurement and systematic errors due to the field's background structure and temporal variability from Cen A's nuclear region are determined. The total (Q, U) of the inner lobe region is (1.00 ± 0.07(stat.) ± 0.04(sys.), - 1.72 ± 0.06 ± 0.05) Jy at 100 GHz and (0.80 ± 0.06 ± 0.06, - 1.40 ± 0.07 ± 0.08) Jy at 150 GHz, leading to polarization angles and total errors of -30fdg0 ± 1fdg1 and -29fdg1 ± 1fdg7. These measurements will allow the use of Cen A as a polarized calibration source for future millimeter experiments.

Astrophysical Journal (Astrophys. J.)
Publisher American Astronomical Society
ISSN 0004-637X 
Articles dans des revues avec comité de lecture

cosmic background radiation – galaxies: individual: Centaurus A – instrumentation: polarimeters – radio continuum: general
9 pages, 8 figures, v2 matches version published in ApJ

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