Speaker
Dr
Kenichi Nishikawa
(Univerisyt of Alabama in Huntsville)
Description
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 and AC 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. 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 the combined effects of shock
and kKHI injecting
relativistic jets in ambient plasmas. 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.
We will implement a helical magnetic field in relativistic jets
and investigate its
effects on instabilities and possible reconnection.
Primary author
Dr
Kenichi Nishikawa
(Univerisyt of Alabama in Huntsville)
