COSMO-15, the 19th annual International Conference on Particle Physics and Cosmology

7-11 September 2015
Warsaw, Poland
Europe/Zurich timezone

Cross-correlation between the CMB lensing potential measured by Planck and high-redshift Herschel-ATLAS galaxies

10 Sep 2015, 16:50
20m
Main Hall ()

Speaker

Pawel Bielewicz (SISSA, Italy)

Description

We present the first measurement of the correlation between the map of the CMB lensing potential derived from the Planck mission data and high-redshift galaxies detected by the Herschel-ATLAS (H-ATLAS) survey. This galaxy catalogue is the highest redshift sample for which the correlation between Planck CMB lensing and tracers of large-scale structure has been investigated so far. We perform a number of null tests and reject the no CMB lensing-galaxy correlation hypothesis at a 20σ significance. The significance of the detection of the theoretically expected cross-correlation signal is found to be 10σ. The estimated galaxy bias, b=2.8 ± 0.1, is consistent with earlier estimates of the bias for the H-ATLAS galaxies at similar redshift. On the other hand, the amplitude of the cross-correlation is found to be a factor 1.6 ± 0.2 higher than expected from the standard model and found by cross-correlation analyses with other tracers of the large-scale structure. We have investigated few possible reasons for the excess amplitude however any of them can not fully account for the enhanced cross-correlation signal.