Marcella Massardi (Istituto Nazionale di Astrofisica (INAF))

Planck & the ground-based telescopes sinergies - Marcella Massardi Colloquium

ATNF Marsfield Lecture Theatre

Abstract

ESA's Planck satellite, in addition to improving anisotropy measurements of the CMB, is performing all-sky, low resolution, survey in nine bands from 30 to 857 GHz, detecting a large sample of extragalactic radio sources. In this talk we will discuss the role of extragalactic radio sources in CMB data.
We will show the importance and the results of the Planck ATCA Co-eval Observations (PACO, C2046) project. Thanks to the observations of a consistent sample of AT20G objects simultaneously with the Planck satellite in three pairs of 2-GHz-wide channels from 4.5 to 40 GHz we will provide pieces of information useful to reconstruct the SED across
the radio and FIR bands in several epochs, to investigate the properties of populations, and to improve the models that describe the physics of radiosources. They will also give us values of flux densities and polarization useful for Planck calibration, and to quantify the quality of the source detection techniques applied to the Planck maps. We will show similar projects on-going with other (northern hemisphere) telescopes.
We will also discuss how the CMB-dipole based fluxes could help the ground based telescope calibration.