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SUMMARY:The CIB-lensing bispectrum: impact on primordial non-Gaussianity a
 nd detectability for the Planck mission - Andres Curto (Cavendish)
DTSTART:20160125T130000Z
DTEND:20160125T140000Z
UID:TALK63976@talks.cam.ac.uk
CONTACT:Tommaso Giannantonio
DESCRIPTION:I will characterise the bispectrum generated by the interplay 
 between the cosmic infrared background\n(CIB) radiation and the gravitatio
 nal lensing effect\, the CIB-lensing bispectrum. This bispectrum can\ncorr
 elate and bias the primordial non-Gaussianity CMB bispectrum measured with
  the Planck\nanisotropy maps. I will review the non-primordial contributio
 ns to the CMB bispectrum that we have\nalready considered in the Planck 20
 15 Results. I will show that the CIB-lensing bispectrum has a\nconsiderabl
 e strength and that it can be detected with high significance in the Planc
 k high-frequency\nmaps. I will also present forecasts of the contamination
  on different shapes of the primordial non-\nGaussianity fnl parameter pro
 duced by the CIB-lensing bispectrum and by the extragalactic point\nsource
 s bispectrum in the Planck high-resolution CMB anisotropy maps. The local\
 , equilateral and\northogonal shapes are considered for ‘raw’ single-f
 requency (i.e. without applying any component\nseparation technique) and f
 oreground-reduced Planck temperature maps. The CIB-lensing correlation\nma
 inly affects orthogonal shapes of the bispectrum at the 143 and 217 GHz ba
 nds\, respectively – while\npoint sources mostly impact equilateral shap
 es at 100\, 143 and 217 GHz. However\, the results indicate\nthat these co
 ntaminants do not induce any relevant bias on Planck fnl estimates when fo
 regroundreduced\nmaps are considered. Using SEVEM for the component separa
 tion\, we obtain a maximum\nbias of 0.30σ and 0.45σ for the orthogonal a
 nd equilateral shapes respectively. This component\nseparation technique i
 s\, in fact\, able to partially clean the extragalactic source contaminati
 on and the\nbias is reduced for all the shapes. We have further developed 
 single and multiple-frequency estimators\nbased on the Komatsu\, Spergel &
  Wandelt formalism.
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
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