Improved dark energy detection through the polarization-assisted cross correlation of the cosmic microwave background with radio sources

Journal Article · Tue Mar 15 04:00:00 EDT 2011 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.83.063001· OSTI ID:21537488

Liu, Guo-Chin ^[1]; Ng, Kin-Wang ^[2]; Pen, Ue-Li ^[3]

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1. Department of Physics, Tamkang University, Tamsui, Taipei County, Taiwan 251 (China)
2. Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan 115 (China)
3. Canadian Institute for Theoretical Astrophysics, University of Toronto, 60 St. George Street, Toronto, ON M5S 3H8 (Canada)

Integrated Sachs-Wolfe (ISW) effect can be estimated by cross-correlating the cosmic microwave background (CMB) sky with tracers of the local matter distribution. At late cosmic time, the dark energy-induced decay of gravitation potential generates a cross correlation signal on large angular scales. The dominant noise is the intrinsic CMB anisotropies from the inflationary epoch. In this paper we use CMB polarization to reduce this intrinsic noise. We cross-correlate the microwave sky observed by Wilkinson Microwave Anisotropy Probe (WMAP) with the radio source catalog compiled by NRAO VLA Sky Survey (NVSS) to study the efficiency of the noise suppression. We find that the error bars are reduced by about 4 to 14% and the statistical power in the signal is improved.

• OSTI ID: 21537488
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 6 Vol. 83; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANISOTROPY
CORRELATIONS
DECAY
DETECTION
DISTRIBUTION
EFFICIENCY
ELECTROMAGNETIC RADIATION
ERRORS
GRAVITATION
MATTER
MICROWAVE RADIATION
NOISE
NONLUMINOUS MATTER
PARTICLE DECAY
POLARIZATION
RADIATIONS
RELICT RADIATION