Combined first- and second-order Fermi acceleration in radio galaxy hot spots

Details Combined first- and second-order Fermi acceleration in radio galaxy hot spots Combined first- and second-order Fermi acceleration in radio galaxy hot spots

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...260...49k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 260, no. 1-2, p. 49-57.

Astronomy and Astrophysics

Astrophysics

9

Particle Acceleration, Plasma Radiation, Radio Galaxies, Relativistic Particles, Fermi Surfaces, Magnetohydrodynamic Turbulence, Synchrotron Radiation

Scientific paper

We investigate the transport of relativistic particles in radio galaxy hot spots using the diffusion approximation and including both first and second order Fermi acceleration. Our intention is to determine the effect Fermi acceleration of the second order may have on synchrotron spectra of hot spots. This seems useful due to the high Alfven velocities therein. At least in the case of flat spectrum hot spots, i.e. with a power-law index above 1/2, pure first-order acceleration is inconsistent with recently derived physical parameters, particularly the high Alfven velocities. This opens the possibility of interpreting the observed radiation of hot spots as created by combined first and second order Fermi acceleration. A difference between the forward and backward wave intensities, often considered as deciding, can not change this result, except for an almost complete absence of one wave type. If we assume a compression ratio of approximately r = 2.5 consistency is restored for the spectra of recently investigated hot spots without need for changing the formerly derived physical parameters.

Affiliated with

Also associated with

No associations

Rating

Combined first- and second-order Fermi acceleration in radio galaxy hot spots does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Combined first- and second-order Fermi acceleration in radio galaxy hot spots, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Combined first- and second-order Fermi acceleration in radio galaxy hot spots will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1203045