Herschel-ATLAS/GAMA : SDSS cross-correlation induced by weak lensing
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We report a highly significant (>10σ) spatial correlation between galaxies with S350μm ≥ 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.
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 , Michalowski , M J , Robotham , A S G , Scott , D , Smith , M W L , Valiante , E & Xia , J-Q 2014 , ' Herschel-ATLAS/GAMA : SDSS cross-correlation induced by weak lensing ' Monthly Notices of the Royal Astronomical Society , vol 442 , no. 3 , pp. 2680-2690 . DOI: 10.1093/mnras/stu1041
Monthly Notices of the Royal Astronomical Society
© 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
The work has been supported in part by the Spanish Ministerio de Ciencia e Innovacion, AYA2012-39475-C02-01, and Consolider-Ingenio 2010, CSD2010-00064, projects and by ASI/INAF Agreement I/072/09/0 for the Planck LFI activity of Phase E2. JGN acknowledges financial support from the Spanish CSIC for a JAE-DOC fellowship, co-funded by the European Social Fund. MN acknowledges final support from PRIN INAF 2012 project ‘Looking into the dust-obscured phase of galaxy formation through cosmic zoom lenses in the Herschel Astrophysical Large Area Survey’.
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