Construction and characterization of CO and tSZ maps from Planck data

Séminaire IPAG de Guillaume Hurier (IAS), jeudi 5 juin 2014 à 11h00, IPAG seminar room

The Planck data covers a large frequency range from 30 GHz to 857 GHz. The sky emission in the micro-wave frequency domain is a mixture of several astrophysical sources, from our galaxy and extra-galactic objects. The 9 frequency channels observed by Planck allow us to performed astrophysical component separation. I present a new component separation method, MILCA, that allows to extract astrophysical components. For example, I present the reconstruction and the characterization of the CO emission at 115, 230 and 345 GHz and the reconstruction of tSZ effect. Rotational transition lines of CO play a major role in molecular radio astronomy and in particular in the study of star formation and the Galactic structure. The tSZ effect is a powerful mass-proxy for extragalactic halo mass, that allows to set tight constraints on cosmological models. Although a wealth of data exists in the Galactic plane and some well-known molecular clouds, there was no available CO high sensitivity all-sky survey. Similarly, the tSZ effect have been observed toward a large number of galaxy clusters. However, the Planck mission offers the first fullsky coverage of the tSZ effect.