Toward a Tomographic Analysis of the Cross-Correlation Between Planck CMB Lensing and H-Atlas Galaxies

Abstract

We present an improved and extended analysis of the cross-correlation between the map of the cosmic microwave background (CMB) lensing potential derived from the Planck mission data and the high-redshift galaxies detected by the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS) in the photometric redshift range  z 1.5 ph . We compare the results based on the 2013 and 2015 Planck datasets, and investigate the impact of different selections of the H-ATLAS galaxy samples. Significant improvements over our previous analysis have been achieved thanks to the higher signal-to-noise ratio of the new CMB lensing map recently released by the Planck collaboration. The effective galaxy bias parameter, b, for the full galaxy sample, derived from a joint analysis of the cross-power spectrum and of the galaxy auto-power spectrum is found to be = -+ b 3.54 0.14 0.15 . Furthermore, a first tomographic analysis of the cross-correlation signal is implemented by splitting the galaxy sample into two redshift intervals: 0.24 for the higher redshift bin. Consistent with our previous analysis, we find that the amplitude of the cross-correlation signal is a factor of -+ 1.45 0.13 0.14 higher than expected from the standard ΛCDM model for the assumed redshift distribution. The robustness of our results against possible systematic effects has been extensively discussed, although the tension is mitigated by passing from 4 to 3σ.

Lensing corrections to theEg(z) statistics from large scale structure

“…The redshift distributions of galaxies dN/dz are the same as in Fig 1. These cross-spectra are calculated for b = 1 and s = 0. The latest measurement error from DES science-verification data [25] and H-ATLAS galaxies [23] is of the order of 10% which is expected to improve.…”

Wide-area tomography of CMB lensing and the growth of cosmological density fluctuations

“…The Planck -derived CMB lensing map was also shown to correlate with SDSS-based galaxy lensing (Singh et al 2017). Correlations have also been found between CMB lensing and high-z H-ATLAS galaxies (Bianchini et al 2016) and with QSOs (Sherwin et al 2012;Geach et al 2013). The precision of these results is however limited because the catalogues under study generally cover a smaller sky area than the all-sky Planck coverage, the only exception being the WISE quasar sample.…”

Scale-dependent galaxy bias, CMB lensing-galaxy cross-correlation, and neutrino masses

“…(3) and determined by the choice of parameters a and c in the MCMC analysis, while the theoretical nonlinear matter power spectrum P (k, z) is computed using the Boltzmann solver CAMB [33] and Halofit [34,35] starting from the given cosmological parameters. Furthermore, χ(z) is the comoving distance to redshift z, f g (z) is the redshift distribution of the galaxy sample, H(z) is the Hubble parameter, and W κ (z) is the CMB lensing convergence kernel [24,[36][37][38][39][40][41][42][43][44][45][46][47]:…”