Seminar by Dr. Hoang Chi Thiem
Title: “Polarization of Anomalous Microwave Emission from Ferromagnetic Nanoparticles”
Speaker: Dr. Hoang Chi Thiem(Canadian Institute for Theoretical Astrophysics).
Time: 2:00pm, Monday, January 4th, 2016.
Location: Room 323, Physics Department, HNUE.
Anomalous microwave emission (AME) in the 10-60 GHz frequency range is an important Galactic foreground component that contaminates the cosmic microwave background (CMB) radiation, which was discovered 20 years ago in the course of data analysis from COBE. With the explosion of CMB experiments hunting for primordial gravitational waves from the early universe through the CMB B-mode signal, a pressing issue is to have an accurate model of the AME polarization that allows for precise removal of CMB foregrounds and correct
measurements of the B-mode signal. In this talk, I will first discuss basic magnetic properties of nanoparticles in astrophysics and its microwave emission as a source of AME. Then, I will discuss theoretical foundations for the polarization of AME and present our new predictions for the polarization of magnetic dust emission. I will finish by showing that our theoretical predictions are in a good agreement with observational data.
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