Full-Sky Acoustic Peak Shifts from Patches
Ming-Feng Ho1,2*, Lung-Yih Chiang2
1Graduate Institute of Astrophysics, National Taiwan University, Taipei, Taiwan
2Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan
* Presenter:Ming-Feng Ho, email:mfho@asiaa.sinica.edu.tw
In doing analysis of the acoustic peaks from randomly selected small patches on ESA Planck cosmic microwave background temperature anisotropies, we construct a full-sky feature map for the peak shifts, which provides a new way for statistics of full-sky cosmology. Several regions in our feature map reveal shifts of peaks toward larger scales including the well-known Cold Spot region. We apply rolling regression on our full-sky feature maps and WISE-2MASS galaxy density map in Healpix spherical data format, but only weak correlations are found and mainly locate on areas with shifts of peaks toward smaller scale. In the modes of multipole expansions of the feature map, the dipole moment in the full-sky peak shifts is found to be significantly large compared to simulation. Furthermore, there is a weak spatial correlation between the dipole moment of our peak-shift feature map and the residuals of supernovae distances from best-fit ΛCDM cosmology in SDSS-II/SNLS3 Joint Light-Curve Analysis data.


Keywords: observational cosmology, large scale structure of universe, cosmic microwave background, data analysis