Luni, 29 iulie 2013, începând cu ora 11:00 Institutul de Științe Spațiale (ISS) organizează un colocviu ce îl are ca invitat pe Prof. Dr. Ken-Ichi Nishikawa de la Universitatea din Alabama/ NSSTC, S.U.A. Colocviul are loc în Sala Studio din clădirea IFA, etajul 2.
Sumarul prezentării se regăsește mai jos. Prezentarea se va ține în limba engleză. Mai multe detalii despre Prof. Dr. Ken-Ichi Nishikawa aici.
Colocviul se adresează unui public avizat. Cei care doresc mai multe informații sunt rugați să trimită un email la Ioana Duțan, idutan at spacescience.ro
Radiation from Accelerated Particles in Relativistic Jets in Active Galactic Nuclei and Gamma-ray Bursts
Abstract: We investigated particle acceleration and shock structure associated with an unmagnetized relativistic jet propagating into an unmagnetized plasma. Strong magnetic fields generated in the trailing shock contribute to the electron’s transverse deflection and acceleration. Kinetic Kelvin-Helmholtz instability (KKHI) is also responsible to create strong DC magnetic fields. The velocity shears in core-sheath jets create strong magnetic field perpendicular to the jet. We examine how the Lorentz factors of jets affect the growth rates of KKHI. 3D RMHD simulations show current-driven kink instability. In relativistic jets recollimation shocks are generated, which accelerate particles. We have calculated, self-consistently, the radiation from electrons accelerated in these turbulent magnetic fields in the shocks. We found that the synthetic spectra depend on the bulk Lorentz factor of the jet, its temperature and strength of the generated magnetic fields. We will investigate synthetic spectra from accelerated electrons in strong magnetic fields generated by KKHI. The calculated properties of the emerging radiation provide our understanding of the complex time evolution and/or spectral structure in gamma-ray bursts, relativistic jets in general, and supernova remnants.