DR. TUHIN GHOSH

Planck has mapped the sky at microwave frequencies with unprecedented sensitivity. The data is revealing a new sky we have started to explore. Various all-sky diffuse emission components are identified and separated, which include carbon monoxide (CO), thermal dust, anomalous microwave emission (AME), zodiacal light and cosmic infrared background (CIB) emission. The speaker will review some of the recent Planck results related to these Galactic emission components. In particular, he will discuss about our present understanding of the large dust grain physics originating from our own Galaxy, variation of dust SED with frequency and potentially with dust temperature, environment and metallicity. He will also summarize the current finding of the Planck polarization data analysis. The 353 GHz Planck polarized map reveals the large-scale Galactic magnetic field as projected on the plane of the sky. The polarization data allows for the characterization of the polarization properties of the dust grains, the structure of magnetic field at large and small scales, and the coupling between interstellar matter and turbulence. The speaker will present the key scientific questions that are being addressed with the first set of Galactic Planck polarization papers. This information would help in better separation of the Galactic foreground emission from CMB and first detection of the primordial B-modes.