Events

Investigating Black Hole Jet through Polarization Images

Abstract: The global- and space-scaled Very Long Baseline Interferometry (VLBI) observations has opened up a new horizon for the study of magnetically-driven astrophysical jets, reaching the most essential, innermost region around the supermassive black holes (BH). Seizing this opportunity, polarimetric general relativistic radiative transfer (GRRT) is performed based on general relativistic magnetohydrodynamics (GRMHD) models, to investigate the relationship between observational features and theoretical models. In this talk, I will discuss our new results shedding a new light on a connection between horizon-scaled dynamics and extended jet images, as well as topics of polarization separation around BH and of polarization flipping in optically-thick nonthermal plasmas. We find that the variability of magnetic flux on the event horizon is imprinted into observed jet widths up to hundreds times larger scale. For example, a drop in the magnetic flux leads a truncation of jet with a time delay. This implies that we can examine the dynamical history of BH through jet images, and conversely, can predict upcoming changes in jet shape from direct observation of BH. I will also discuss the polarization features on the jet reflecting the magnetic field configuration and plasma acceleration profile, and a possibility of determination of BH spin via the jet images.

Monday, September 23, 2024 11:00 AM