COSMIC MICROWAVE BACKGROUND POLARIZATION AND TEMPERATURE POWER SPECTRA ESTIMATION USING LINEAR COMBINATION OF WMAP 5 YEAR MAPS

Journal Article · Sat May 01 04:00:00 EDT 2010 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/714/1/840· OSTI ID:21448861

Samal, Pramoda Kumar; Jain, Pankaj ^[1]; Saha, Rajib ^[2]; Delabrouille, Jacques ^[3]; Prunet, Simon ^[4]; Souradeep, Tarun ^[5]

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1. Department of Physics, Indian Institute of Technology, Kanpur (India)
2. Jet Propulsion Laboratory, M/S 169-327, 4800 Oak Grove Drive, Pasadena, CA 91109 (United States)
3. CNRS, Laboratoire APC, 10, rue Alice Domon et Leonie Duquet, 75205 Paris (France)
4. Institut d'Astrophysique de Paris, 98 bis Boulevard Arago, F-75014 Paris (France)
5. Inter-University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune 411007 (India)

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{sub l} /2{pi}) is 532 {mu}K{sup 2}, approximately 2.5 times the estimate (213.4 {mu}K{sup 2}) made by the WMAP team.

• OSTI ID: 21448861
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 1 Vol. 714; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ANISOTROPY
BACKGROUND RADIATION
COMPUTERIZED SIMULATION
DATA ANALYSIS
ELECTROMAGNETIC RADIATION
MAPS
MICROWAVE RADIATION
POINT SOURCES
POLARIZATION
RADIATION SOURCES
RADIATIONS
RELICT RADIATION
SIMULATION
SPECTRA