Herschel-ATLAS/GAMA: SDSS cross-correlation induced by weak lensing

González-Nuevo, J, Lapi, A, Negrello, M, Danese, L, De Zotti, G, Amber, S, Baes, M, Bland-Hawthorn, J, Bourne, N, Brough, S, Bussmann, R S, Cai, Z -Y, Cooray, A, Driver, S P, Dunne, L, Dye, S, Eales, S, Ibar, E, Ivison, R, Liske, J, Loveday, J, Maddox, S, Micha owski, M J, Robotham, A S G, Scott, D, Smith, M W L, Valiante, E and Xia, J -Q (2014) Herschel-ATLAS/GAMA: SDSS cross-correlation induced by weak lensing. Monthly Notices of the Royal Astronomical Society, 442 (3). pp. 2680-2690. ISSN 0035-8711

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Abstract

We report a highly significant (>10σ) spatial correlation between galaxies with S350 μm ≥ 30 mJy detected in the equatorial fields of the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS) with estimated redshifts ≳ 1.5, and Sloan Digital Sky Survey (SDSS) or Galaxy And Mass Assembly (GAMA) galaxies at 0.2 ≤ z ≤ 0.6. The significance of the cross-correlation is much higher than those reported so far for samples with non-overlapping redshift distributions selected in other wavebands. Extensive, realistic simulations of clustered sub-mm galaxies amplified by foreground structures confirm that the cross-correlation can be explained by weak gravitational lensing (μ < 2). The simulations also show that the measured amplitude and range of angular scales of the signal are larger than can be accounted for by galaxy–galaxy weak lensing. However, for scales ≲ 2 arcmin, the signal can be reproduced if SDSS/GAMA galaxies act as signposts of galaxy groups/clusters with halo masses in the range 1013.2–1014.5 M⊙. The signal detected on larger scales appears to reflect the clustering of such haloes.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QB Astronomy
Depositing User: Jonathan Loveday
Date Deposited: 24 Jun 2015 15:27
Last Modified: 14 Mar 2017 05:17
URI: http://sro.sussex.ac.uk/id/eprint/54680

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