Cold imprint of supervoids in the cosmic microwave background re-considered with Planck and Baryon Oscillation Spectroscopic Survey DR10

Abstract

We analyse publicly available void catalogues of the Baryon Oscillation Spectroscopic Survey Data Release 10 (DR10) at redshifts 0.4 < z < 0.7. The first goal of this paper is to extend the cosmic microwave background (CMB) stacking analysis of previous spectroscopic void samples at z < 0.4. In addition, the DR10 void catalogue provides the first chance to spectroscopically probe the volume of the Granett et al. supervoid catalogue that constitutes the only set of voids which has shown a significant detection of a cross-correlation signal between void locations and average CMB chill. We found that the positions of voids identified in the spectroscopic DR10 galaxy catalogue typically do not coincide with the locations of the Granett et al. supervoids in the overlapping volume, in spite of the presence of large underdense regions of high void-density in DR10. This failure to locate the same structures with spectroscopic redshifts may arise due to systematic differences in the properties of voids detected in photometric and spectroscopic samples. In the stacking measurement, we first find a δT =-11.5 ± 3.7 μK imprint for 35 of the 50 Granett et al. supervoids available in the DR10 volume. For the DR10 void catalogue, lacking a prior on the number of voids to be considered in the stacking analysis, we find that the correlationmeasurement is fully consistent with no correlation. However, the measurement peaks with amplitude δT =-9.8 ± 4.8 μK for the a posteriori-selected 44 largest voids of size R > 65 h-1 Mpc that does match in terms of amplitude and number of structures the Granett et al. observation, although at different void positions.