An optimal estimator for the CMB-LSS angular power spectrum and its application to WMAP and NVSS data

Details An optimal estimator for the CMB-LSS angular power spectrum and its application to WMAP and NVSS data An optimal estimator for the CMB-LSS angular power spectrum and its application to WMAP and NVSS data

2012-03-15

arxiv.org/abs/1203.3277v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

12 pages, 12 figures

Scientific paper

We use a Quadratic Maximum Likelihood (QML) method to estimate the angular power spectrum of the cross-correlation between cosmic microwave background and large scale structure maps as well as their individual auto-spectra. We describe our implementation of this method and demonstrate its accuracy on simulated maps. We apply this optimal estimator to WMAP 7-year and NRAO VLA Sky Survey (NVSS) data and explore the robustness of the angular power spectrum estimates obtained by the QML method. With the correction of the declination systematics in NVSS, we can safely use most of the information contained in this survey. We then make use of the angular power spectrum estimates obtained by the QML method to derive constraints on the dark energy critical density in a flat $\Lambda$CDM model by different likelihood prescriptions. When using just the cross-correlation between WMAP 7 year and NVSS maps with 1.8$^\circ$ resolution, the best-fit model has a cosmological constant of approximatively 70% of the total energy density, disfavouring an Einstein-de Sitter Universe at more than 2 $\sigma$ CL (confidence level).

Affiliated with

Also associated with

No associations

Rating

An optimal estimator for the CMB-LSS angular power spectrum and its application to WMAP and NVSS data does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with An optimal estimator for the CMB-LSS angular power spectrum and its application to WMAP and NVSS data, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and An optimal estimator for the CMB-LSS angular power spectrum and its application to WMAP and NVSS data will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-30345