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A Cosmic Microwave Background Lensing Mass Map and its correlation with the Cosmic Infrared Background

A Cosmic Microwave Background Lensing Mass Map and its correlation with the Cosmic Infrared Background

Publication date: 20 June 2013

Authors: Holder, G.P., et al.

Journal: The Astrophysical Journal Letters
Volume: 771
Issue: 1
Page: L16
Year: 2013

Copyright: IOP Publishing

We use a temperature map of the cosmic microwave background (CMB) obtained using the South Pole Telescope at 150 GHz to construct a map of the gravitational convergence to z ~ 1100, revealing the fluctuations in the projected mass density. This map shows individual features that are significant at the ~4 sigma level, providing the first image of CMB lensing convergence. We cross-correlate this map with Herschel/SPIRE maps covering 90 deg² at wavelengths of 500, 350, and 250 micron. We show that these submillimeter (submm) wavelength maps are strongly correlated with the lensing convergence map, with detection significances in each of the three submm bands ranging from 6.7 sigma to 8.8 sigma. We fit the measurement of the cross power spectrum assuming a simple constant bias model and infer bias factors of b = 1.3-1.8, with a statistical uncertainty of 15%, depending on the assumed model for the redshift distribution of the dusty galaxies that are contributing to the Herschel/SPIRE maps.

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