Cross-correlation of CMB Polarization Lensing with High-z Submillimeter Herschel-ATLAS Galaxies
Baccigalupi, C.; Borrill, J.; Stompor, R.; Linder, E.; Reichardt, C. L.; Lee, A. T.; Carron, J.; Krachmalnicoff, N.; Errard, J.; Teply, G. P.; Polarbear Collaboration; Arnold, K.; Barron, D.; Beck, D.; Bianchini, F.; Boettger, D.; Chinone, Y.; Elleflot, T.; Fabbian, G.; Feng, C.; Galitzki, N.; Goeckner-Wald, N.; Hasegawa, M.; Hazumi, M.; Howe, L.; Kaneko, D.; Katayama, N.; Keating, B.; Kusaka, A.; Leon, D.; Matsuda, F.; Minami, Y.; Navaroli, M.; Nishino, H.; Pham, A. T. P.; Poletti, D.; Puglisi, G.; Sherwin, B. D.; Silva-Feaver, M.; Suzuki, A.; Tajima, O.; Takakura, S.; Takatori, S.; Aguilar Faúndez, M.; Cheung, K.; El Bouhargani, H.; Lowry, L. N.; Tsai, C.; Vergès, C.
United States, Chile, Italy, France, Australia, United Kingdom, Japan
Abstract
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 {log}}10({M}h/{M}⊙ )={13.5}-0.3+0.2 at an effective redshift of z ∼ 2 from the cross-correlation power spectrum. Residual uncertainties in the redshift distribution of the submillimeter 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 extragalactic 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.