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. Ganga, W. K. Gear, S. Gupta, J. Hinderks, J. Kovac, A. E. Lange, E. Leitch, S. J. Melhuish, Y. Memari, J. A. MurphyA. 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

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

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 05. 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 100GHz and (0.80±0.06±0.06, - 1.40±0.07±0.08) Jy at 150GHz, leading to polarization angles and total errors of -30°0±1°1 and -29°1±1°7. These measurements will allow the use of Cen A as a polarized calibration source for future millimeter experiments.

Original languageEnglish (US)
Pages (from-to)1541-1550
Number of pages10
JournalAstrophysical Journal
Volume710
Issue number2
DOIs
StatePublished - 2010

Keywords

  • Cosmic background radiation
  • Galaxies: individual (Centaurus A)
  • Instrumentation: polarimeters
  • Radio continuum: general

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