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Cross-correlation between cosmological and astrophysical datasets: the Planck and Herschel case

Published online by Cambridge University Press:  01 July 2015

Federico Bianchini  and
Andrea Lapi
Federico Bianchini
Affiliation:
SISSA, Via Bonomea 265, I-34136, Trieste, Italy email: [email protected]
Andrea Lapi
Affiliation:
SISSA, Via Bonomea 265, I-34136, Trieste, Italy email: [email protected]
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Abstract

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We present the first measurement of the correlation between the map of the CMB lensing potential derived from the Planck nominal mission data and z ≳ 1.5 galaxies detected by Herschel-ATLAS (H-ATLAS) survey covering about 550 deg2. We detect the cross-power spectrum with a significance of ∼ 8.5σ, ruling out the absence of correlation at 9σ. We check detection with a number of null tests. The amplitude of cross-correlation and the galaxy bias are estimated using joint analysis of the cross-power spectrum and the galaxy survey auto-spectrum, which allows to break degeneracy between these parameters. The estimated galaxy bias is consistent with previous estimates of the bias for the H-ATLAS data, while the cross-correlation amplitude is higher than expected for a ΛCDM model. The content of this work is to appear in a forthcoming paper Bianchini, et al. (2014).

Keywords

cosmology: cosmic microwave backgroundgravitational lensinggalaxies: high-redshiftmethods: data analysis
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Symposium S306: Statistical Challenges in 21st Century Cosmology , May 2014 , pp. 202 - 205
Copyright
Copyright © International Astronomical Union 2015 

References

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