LESIA - Observatoire de Paris

A Monte-Carlo radiative transfer code to explore the polarisation signatures of dusty disks and torii and its application to torii in active galactic nuclei

vendredi 12 octobre 2018, par Lucas Grosset (LESIA)

Jeudi 18 octobre 2018 à 16h00 , Lieu : Salle de conférence du bâtiment 17

One of the main observational challenges for investigating the central regions of active galactic nuclei (AGN) at short wavelengths, using high angular resolution, and high contrast observations, is to directly detect the circumnuclear optically thick material hiding the central core emission when viewed edge-on. I will present my work on the dust structures of these inner regions and the main results I obtained during my four years in the LESIA. But I will focus particularly on one of the tool I used for this purpose, the simulation code MontAGN, computing the high angular resolution maps of dusty structures, including polarisation, through Monte-Carlo radiative transfer methods in the near infrared. Even at early development stages, simulated maps through MontAGN allowed me to constrain the geometry and density of the structures surrounding the AGN, in particular the dusty torus and the ionisation cone. Furthermore, after 2 years of development, the code is now almost ready for its first release and will be soon available after few upgrades.