|Time:||Thursday, March 25, 2021, 02:00pm|
|Title:||Analytical Solution of Magnetically Dominated Astrophysical Jets and Winds: Jet Launching, Acceleration, and Collimation|
|Speaker:||Prof. Liang Chen (SHAO)|
S727 & Online via Zoom (ID: 961 8156 5931 / PW: 202103)
Jets/winds are ubiquitously in association with different celestial objects. However, most of previous theoretical studies of them rely on numerical calculations, not being able to provide a more convenient way for understanding rather abundant observational results. Now we have obtained a general analytical solution for describing a magnetically dominated jet/wind, through separating the “core” equation (which maintains the radial dynamic equilibrium of jet, constructed 1960s) into rotating and non-rotating terms, finding that each of the two-term equations can be solved analytically, and the two solutions match each other very well. This solution is consistent with known theoretical results and numerical simulations, and can be used to interpret main observational results, such as jet shape configuration, acceleration profile (from non-relativistic to relativistic), and polarization pattern etc. Furthermore, the solution is applicable to, e.g., limb-brightening (a hollow jet), periodical signals (a helical jet), and "complex" proper motion pattern (a stratified jet) etc. I this talk, I will present the details of the theory, examples of comparing with observations, and a variety of predictions (Ref. Chen & Zhang, 2021, ApJ, 906, 105).
The speaker got his Ph.D.at Yunnan Astronomical Observatory, CAS in 2010, used to be posdoc researcher at Shanghai Astronomical Observatory, CAS from 2010 to 2012. He became reasearch associate professor Shanghai Astronomical Observatory, CAS since 2012, during this period he was appointed as a visiting scholar at University of Nevada Las Vegas from 2018 to 2019. Now he is a reasearch professor in Shanghai Astronomical Observatory, CAS. His research interests include AGN, extragalactic gamma-ray astronomy, magnetic field from all scales, MHD processes, non-therml emission processes, and currently work on relativistic jets from dynamics, radiative processes and observations.
Host: Wei Cui