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

Gonzalez-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.; Xia, J-Q.

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.

Citation

Gonzalez-Nuevo, J., Lapi, A., Negrello, M., Danese, L., De Zotti, G., Amber, S., Baes, M., Bland-Hawthorn, J., Bourne, N., Brough, S., Bussmann, R., Cai, Z.-Y., Cooray, A., Driver, S., Dunne, L., Dye, S., Eales, S., Ibar, E., Ivison, R., Liske, J., …Xia, J.-Q. (2014). Herschel-ATLAS/GAMA: SDSS cross-correlation induced by weak lensing. Monthly Notices of the Royal Astronomical Society, 442(3), https://doi.org/10.1093/mnras/stu1041

• Journal Article Type: Article
• Acceptance Date: May 23, 2014
• Publication Date: Jun 26, 2014
• Deposit Date: Apr 27, 2017
• Publicly Available Date: Apr 27, 2017
• Journal: Monthly Notices of the Royal Astronomical Society
• Print ISSN: 0035-8711
• Electronic ISSN: 1365-2966
• Publisher: Oxford University Press
• Peer Reviewed: Peer Reviewed
• Volume: 442
• Issue: 3
• DOI: https://doi.org/10.1093/mnras/stu1041
• Keywords: methods: statistical, cosmology: observations, large-scale structure of Universe, infrared: galaxies
• Public URL: https://nottingham-repository.worktribe.com/output/730005
• Publisher URL: https://academic.oup.com/mnras/article-lookup/doi/10.1093/mnras/stu1041
• Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
• Contract Date: Apr 27, 2017