Journal
ASTROPHYSICAL JOURNAL
Volume 714, Issue 1, Pages 840-851Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/714/1/840
Keywords
cosmic background radiation; methods: data analysis; polarization
Categories
Funding
- CSIR, India [CSIR-SRF-9/92(340)/2004-EMR-I]
- National Aeronautics and Space Administration
Ask authors/readers for more resources
We estimate cosmic microwave background (CMB) polarization and temperature power spectra using Wilkinson Microwave Anisotropy Probe (WMAP) 5 year foreground contaminated maps. The power spectrum is estimated by using a model-independent method, which does not utilize directly the diffuse foreground templates nor the detector noise model. The method essentially consists of two steps: (1) removal of diffuse foregrounds contamination by making linear combination of individual maps in harmonic space and (2) cross-correlation of foreground cleaned maps to minimize detector noise bias. For the temperature power spectrum we also estimate and subtract residual unresolved point source contamination in the cross-power spectrum using the point source model provided by the WMAP science team. Our TT, TE, and EE power spectra are in good agreement with the published results of the WMAP science team. We perform detailed numerical simulations to test for bias in our procedure. We find that the bias is small in almost all cases. A negative bias at low l in TT power spectrum has been pointed out in an earlier publication. We find that the bias-corrected quadrupole power (l(l + 1) C-l/2 pi) is 532 mu K-2, approximately 2.5 times the estimate (213.4 mu K-2) made by the WMAP team.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available