Abstract Details
| Name: DEBABRATA ADAK Affiliation: IUCAA, Pune Conference ID: ASI2019_398 Title : Dust Polarization Modelling at Large Scale Using Planck and EBHIS Data Authors and Co-Authors : Debabrata Adak, Tuhin Ghosh, Francois Boulanger, Urmas Haud, Peter MW Kalberla, Flavien Vansyngel, Tarun Souradeep. Abstract Type : Oral Abstract Category : Stars, ISM and Galaxy Abstract : The primary limiting factor in the quest for the primordial CMB B-mode polarization is submillimetre polarized emission from Galactic dust. We need to characterize and separate the Galactic polarized foreground accurately to search for such a faint signal. Therefore dust polarization modelling is an essential step to build a component separation method to separate CMB B-mode from polarized foreground with high accuracy. The Planck and HI emission data together show at high Galactic latitude dust and HI intensities are tightly correlated. Also, the Planck data reveals a line-of-sight depolarization arises due to the turbulent magnetic field. Our paper presents the modelling work on dust polarization over a low column density regions at the Northern Galactic cap taking into account the Planck and EBHIS data together. We provide a model which incorporates a phenomenological magnetic field model and physically motivated HI templates. This seven-parameter model can reproduce all statistical properties over 66% sky of the Northern Galactic cap integration over least number (N = 3) of HI layers along line-of-sight. Our work is an important step towards dust polarization modelling which is useful to assess the accuracy of component separation methods and to quantify the confidence level of separating Galactic polarized foreground and CMB B-mode in present and future CMB missions. |