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Cross-correlation between the CMB lensing potential measured by Planck and high-zsubmillimeter 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, Loretta, Dye, S., Eales, Stephen Anthony, Ivison, R., Maddox, Steve, Negrello, Mattia, Scott, D., Smith, Matthew W. and Valiante, Elisabetta 2015. Cross-correlation between the CMB lensing potential measured by Planck and high-zsubmillimeter galaxies detected by the Herschel-ATLAS survey. Astrophysical Journal 802 (1) , 64. 10.1088/0004-637X/802/1/64

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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 $z\gtrsim 1.5$ galaxies detected by the Herschel-ATLAS (H-ATLAS) survey covering about $600\;{{{\rm deg} }^{2}}$, 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 $20\sigma $ 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 $10\sigma $. 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 $b=2.80_{-0.11}^{+0.12}$, 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
Date Type: Published Online
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Uncontrolled Keywords: cosmic background radiation; galaxies: high-redshift; gravitational lensing: weak; methods: data analysis; Cosmology: observations
Publisher: American Astronomical Society
ISSN: 1538-4357
Date of Acceptance: 23 January 2015
Last Modified: 15 Mar 2019 14:08
URI: http://orca.cf.ac.uk/id/eprint/77750

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