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McKelvey School of Engineering

Astrophysics Seminar on Astrophysical Jets

Friday, September 24 | 9:00 AM

Virtual Event

Understanding the emission processes in blazar jets is important for studying astrophysical jets. The jet radiation and particle acceleration mechanisms of the high-energy emission from blazars can be modelled in many ways. High-energy polarimetry can probe the most active jet regions with the most efficient particle accelerations, and thus serve as a powerful tool to distinguish between models. In a model where a thermal and a non-thermal particle distribution scatters an external radiation field, hard X-ray/γ-ray radiation results from relativistic electrons, and the radiation is predicted to be unpolarized. Contrarily, Ultraviolet (UV)/X-ray radiation, resulting from scattering by thermal electrons, is predicted to be polarized. In this seminar, I will summarize the scientific potential for using high-energy polarimetry to constrain open questions in jet-physics. The advantages of using Monte Carlo methods to study high-energy polarization from anisotropic Compton scattering, by thermal and non-thermal particles, will be discussed. I will conclude by presenting a new Monte-Carlo code - MAPPIES (Monte-Carlo Applications for Partially Polarized Inverse External-Compton Scattering) - for polarization-dependent Compton scattering. I will present the code by showing results of the polarization signatures in a model where the Big Blue Bump (BBB; UV/soft X-ray excess) seen in some blazar spectra arises from the bulk Compton process.

Contact physics@wustl.edu for Zoom details.

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Lectures & Presentations


Arts & Sciences


Science & Technology



Event Contact


Speaker Information
Lenté Dreyer (Hosted by Krawczynski/Errando) from North-West University, Potchefstroom Campus, South Africa will be presenting the seminar "Exploiting High-Energy Polarimetry to Study Astrophysical Jets"
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