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

Gonzalez-Nuevo, J., Lapi, A., Negrello, Mattia ORCID:, 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 ORCID:, Dye, S., Eales, Stephen Anthony ORCID:, Ibar, E., Ivison, R., Liske, J., Loveday, J., Maddox, Steve ORCID:, Micha owski, M. J., Robotham, A. S. G., Scott, D., Smith, Matthew William L. ORCID:, 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: 27 Oct 2022 10:15

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