Cross-correlation of CMB Polarization Lensing with High- z Submillimeter Herschel -ATLAS Galaxies
Résumé
We report a 4.8σ measurement of the cross-correlation signal between the cosmic microwave background (CMB) lensing convergence reconstructed from measurements of the CMB polarization made by the POLARBEAR experiment and the infrared-selected galaxies of the Herschel-ATLAS survey. This is the first measurement of its kind. We infer a best-fit galaxy bias of b=5.76±1.25, corresponding to a host halo mass of log10(Mh/M⊙)=13.5+0.2−0.3 at an effective redshift of z∼2 from the cross-correlation power spectrum. Residual uncertainties in the redshift distribution of the sub-mm galaxies are subdominant with respect to the statistical precision. We perform a suite of systematic tests, finding that instrumental and astrophysical contaminations are small compared to the statistical error. This cross-correlation measurement only relies on CMB polarization information that, differently from CMB temperature maps, is less contaminated by galactic and extra-galactic foregrounds, providing a clearer view of the projected matter distribution. This result demonstrates the feasibility and robustness of this approach for future high-sensitivity CMB polarization experiments
Mots clés
- cosmic background radiation: polarization, cosmic background radiation: temperature, error: statistical, halo: mass, galaxy, redshift: dependence, lens, cosmic background radiation: power spectrum
- cosmic background radiation: polarization, cosmic background radiation: temperature, error: statistical, halo: mass, galaxy, redshift: dependence, lens, cosmic background radiation: power spectrum