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

Gonzalez-Nuevo, J., Lapi, A., Negrello, Mattia, 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, Loretta, Dye, S., Eales, Stephen Anthony, Ibar, E., Ivison, R., Liske, J., Loveday, J., Maddox, Steve, Micha owski, M. J., Robotham, A. S. G., Scott, D., Smith, Matthew William L., Valiante, Elisabetta 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. 10.1093/mnras/stu1041

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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
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Uncontrolled Keywords: methods: statistical; cosmology: observations; large-scale structure of Universe; infrared: galaxies
Publisher: Oxford University Press
ISSN: 0035-8711
Date of Acceptance: 23 May 2014
Last Modified: 08 Jan 2020 04:36

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