Résumé / Abstract Journal-club_Univers

Journal-club Univers / Journal-club Universe

«  New large-scale cosmic infrared background maps from Planck data »

Daniel Lenz
postdoc - Jet Propulsion Lab. (JPL), California Inst. Technology (Caltech) (Pasadena, California, Etats-Unis d'Amérique)

The cosmic infrared background (CIB) is a powerful probe of large-scale structure across a very large redshift range, consisting of unresolved FIR emission from dusty galaxies. It can be used to study the astrophysics of galaxies, the star formation history of the Universe, and the connection between dark and luminous matter. The major difficulty here lies in obtaining accurate and unbiased large-scale CIB images that are cleaned from the contamination by Galactic dust.
We used data of neutral atomic hydrogen from the recently-release HI4PI Survey to create template maps of Galactic dust, allowing us to remove this component from the Planck intensity maps.
I will present our final CIB maps and the various processing- and validation steps that we have performed to ensure the high quality of these maps. Based on these new CIB maps, I will also present a cross correlation analysis of the CIB signal and the Planck CMB lensing map, which can be used to study the primordial non-Gaussianity through a scale-dependent bias term. Aside from this particular application, the soon-to-be public maps will enable the community to investigate a wide range of questions, related to the Universe's large-scale structure.
mardi 16 octobre 2018 - 11:00
IHP, Institut d'Astrophysique
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