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

Bianchini, F., Bielewicz, P., Lapi, A., Gonzalez-Nuevo, J., Baccigalupi, C., de Zotti, G., Danese, L., Bourne, N., Cooray, A., Dunne, L., Dye, S., Eales, S., Ivison, R., Maddox, S., Negrello, M., Scott, D., 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
RIS ID: https://nottingham-repository.worktribe.com/output/746943
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: https://doi.org/10.1088/0004-637X/802/1/64
Depositing User: Eprints, Support
Date Deposited: 27 Apr 2017 11:49
Last Modified: 04 May 2020 17:04
URI: https://eprints.nottingham.ac.uk/id/eprint/42366

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