Other
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...347..692f&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 347, Dec. 15, 1989, p. 692-700. Research supported by DFG.
Other
11
Extragalactic Radio Sources, Infrared Spectra, Relativistic Particles, Shock Waves, Synchrotron Radiation, Turbulence Effects, Astronomical Models, Diffusion Coefficient, Particle Acceleration, Transport Theory, Wave Generation
Scientific paper
High-frequency cutoffs in the infrared synchrotron spectra of several extragalactic radio sources (including hot spots) require relativistic particle distributions with power-law behavior for low momenta and a nearly ideal sharp cutoff at a certain high momentum. The recent photometry of some hotspots provides an ideal opportunity to test theoretical models. So far, model spectra obtained by applying a first-order Fermi model and using a constant or variable spatial diffusion coefficient failed to match the steep cutoffs althoguh they reproduce other features of the observed spectra. However, taking into account the self-generated turbulence by the relativistic particles on the upstream side of the shock completely changes the spectral behavior near the cutoff and leads to extraordinarily good fits to observed data. It turns out that the upstream side plays the major role in determining the shape of the cutoff. Applying a simple plane and parallel geometry of magnetic field and plasma velocity, the transport equation is solved numerically and the results are presented depending on one parameter, the background level of turbulence. Some important physical parameters can be derived and expressed in terms of observable quantities.
No associations
LandOfFree
An explanation of abrupt infrared cutoffs of extragalactic radio sources by shock accelerated particles including self-generated turbulence 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 An explanation of abrupt infrared cutoffs of extragalactic radio sources by shock accelerated particles including self-generated turbulence, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and An explanation of abrupt infrared cutoffs of extragalactic radio sources by shock accelerated particles including self-generated turbulence will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1566992