CMB lensing tomography with the DES Science Verification galaxies

Giannantonio, T, Fosalba, P, Cawthon, R, Omori, Y, Crocce, M, Elsner, F, Leistedt, B, Dodelson, S, Benoit-Lévy, A, Gaztañaga, E, Holder, G, Peiris, H V, Percival, W J, Kirk, D, Bauer, A H, Benson, B A, Bernstein, G M, Carretero, J, Crawford, T M, Crittenden, R, Huterer, D, Jain, B, Krause, E, Reichardt, C L, Ross, A J, Simard, G, Soergel, B, Stark, A, Story, K T, Vieira, J D, Weller, J, Abbott, T, Abdalla, F B, Allam, S, Armstrong, R, Banerji, M, Bernstein, R A, Bertin, E, Brooks, D, Buckley-Geer, E, Burke, D L, Capozzi, D, Carlstrom, J E, Carnero Rosell, A, Carrasco Kind, M, Castander, F J, Chang, C L, Cunha, C E, da Costa, L N, D'Andrea, C B, DePoy, D L, Desai, S, Diehl, H T, Dietrich, J P, Doel, P, Eifler, T F, Evrard, A E, Neto, A Fausti, Fernandez, E, Finley, D A, Flaugher, B, Frieman, J, Gerdes, D, Gruen, D, Gruendl, R A, Gutierrez, G, Holzapfel, W L, Honscheid, K, James, D J, Kuehn, K, Kuropatkin, N, Lahav, O, Li, T S, Lima, M, March, M, Marshall, J L, Martini, P, Melchior, P, Miquel, R, Mohr, J J, Nichol, R C, Nord, B, Ogando, R, Plazas, A A, Romer, A K, Roodman, A, Rykoff, E S, Sako, M, Saliwanchik, B R, Sanchez, E, Schubnell, M, Sevilla-Noarbe, I, Smith, R C, Soares-Santos, M, Sobreira, F, Suchyta, E, Swanson, M E C, Tarle, G, Thaler, J, Thomas, D, Vikram, V, Walker, A R, Wechsler, R H and Zuntz, J (2016) CMB lensing tomography with the DES Science Verification galaxies. Monthly Notices of the Royal Astronomical Society, 456 (3). pp. 3213-3244. ISSN 0035-8711

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We measure the cross-correlation between the galaxy density in the Dark Energy Survey (DES) Science Verification data and the lensing of the cosmic microwave background (CMB) as reconstructed with the Planck satellite and the South Pole Telescope (SPT). When using the DES main galaxy sample over the full redshift range 0.2 < zphot< 1.2, a cross-correlation signal is detected at 6sigma and 4sigma with SPT and Planck , respectively. We then divide the DES galaxies into five photometric redshift bins, finding significant (>2sigma) detections in all bins. Comparing to the fiducial Planck cosmology, we find the redshift evolution of the signal matches expectations, although the amplitude is consistently lower than predicted across redshift bins. We test for possible systematics that could affect our result and find no evidence for significant contamination. Finally, we demonstrate how these measurements can be used to constrain the growth of structure across cosmic time. We find the data are fit by a model in which the amplitude of structure in the z< 1.2 universe is 0.73 ± 0.16 times as large as predicted in the Lambda cold dark matter Planck cosmology, a 1.7sigma deviation.

Item Type: Article
Keywords: Cosmic background radiation, Gravitational lensing: weak, Large-scale structure of Universe
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QB Astronomy
Depositing User: Richard Chambers
Date Deposited: 05 May 2016 12:47
Last Modified: 09 Mar 2017 06:20

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Project NameSussex Project NumberFunderFunder Ref
Astrophysics and Cosmology - Sussex Consolidated GrantG1291STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCILST/L000652/1