Cross-correlation between the CMB lensing potential measured by Planck and high-z submillimeter galaxies detected by the Herschel-ATLAS survey

Bianchini, F. and Bielewicz, P. and Lapi, A. and Gonzalez-Nuevo, J. and Baccigalupi, C. and de Zotti, G. and Danese, L. and Bourne, N. and Cooray, A. and Dunne, L. and Dye, S. and Eales, S. and Ivison, R. and Maddox, S. and Negrello, M. and Scott, D. and Smith, M.W.L. and Valiante, E. (2015) Cross-correlation between the CMB lensing potential measured by Planck and high-z submillimeter galaxies detected by the Herschel-ATLAS survey. Astrophysical Journal, 802 (1). p. 64. ISSN 1538-4357

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Abstract

We present the first measurement of the correlation between the map of the cosmic microwave background (CMB) lensing potential derived from the Planck nominal mission data and z≥1.5 galaxies detected by the Herschel-ATLAS (H-ATLAS) survey covering about 600 deg2, i.e., about 1.4% of the sky. We reject the hypothesis that there is no correlation between CMB lensing and galaxy detection at a significance, checking the result by performing a number of null tests. The significance of the detection of the theoretically expected cross-correlation signal is found to be . The galaxy bias parameter, b, derived from a joint analysis of the cross-power spectrum and of the autopower spectrum of the galaxy density contrast is found to be , consistent with earlier estimates for H-ATLAS galaxies at similar redshifts. On the other hand, the amplitude of the cross-correlation is found to be a factor 1.62 ± 0.16 higher than expected from the standard model and also found by cross-correlation analyses with other tracers of the large-scale structure. The enhancement due to lensing magnification can account for only a fraction of the excess cross-correlation signal. We suggest that part of it may be due to an incomplete removal of the contamination of the cosmic infrared background, which includes the H-ATLAS sources we are cross-correlating with. In any case, the highly significant detection reported here using a catalog covering only 1.4% of the sky demonstrates the potential of CMB lensing correlations with submillimeter surveys.

Item Type: Article
Keywords: cosmic background radiation; galaxies: high-redshift; gravitational lensing: weak; methods: data analysis; Cosmology: observations
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
Identification Number: 10.1088/0004-637X/802/1/64
Depositing User: Eprints, Support
Date Deposited: 27 Apr 2017 11:49
Last Modified: 28 Apr 2017 12:39
URI: http://eprints.nottingham.ac.uk/id/eprint/42366

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