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

J. González-Nuevo, A. Lapi, M. Negrello, L. Danese, G. De Zotti, S. Amber, M. Baes, J. Bland-Hawthorn, N. Bourne, S. Brough, R.S. Bussmann, Z.-Y. Cai, A. Cooray, S.P. Driver, L. Dunne, S. Dye, S. Eales, E. Ibar, R. Ivison, J. LiskeJ. Loveday, S. Maddox, M.J. Michalowski, A.S.G. Robotham, D. Scott, M.W.L. Smith, E. Valiante, J.-Q. Xia

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Abstract

We report a highly significant (> 10 sigma) spatial correlation between galaxies with S-350 mu m a parts per thousand yen 30 mJy detected in the equatorial fields of the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS) with estimated redshifts a parts per thousand(3) 1.5, and Sloan Digital Sky Survey (SDSS) or Galaxy And Mass Assembly (GAMA) galaxies at 0.2 a parts per thousand currency sign z a parts per thousand currency sign 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 (mu < 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 a parts per thousand(2) 2 arcmin, the signal can be reproduced if SDSS/GAMA galaxies act as signposts of galaxy groups/clusters with halo masses in the range 10(13.2)-10(14.5) M-aS (TM). The signal detected on larger scales appears to reflect the clustering of such haloes.
Original languageEnglish
Pages (from-to)2680-2690
Number of pages11
JournalMonthly Notices of the Royal Astronomical Society
Volume442
Issue number3
Early online date27 Jun 2014
DOIs
Publication statusPublished - 11 Aug 2014

Keywords

  • Methods: statistical
  • Cosmology: observations
  • Large-scale structure of Universe
  • Infrared: galaxies

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