932 research outputs found
Scaling Laws in High-Energy Inverse Compton Scattering
Based upon the rate equations for the photon distribution function obtained
in the previous paper, we study the inverse Compton scattering process for
high-energy nonthermal electrons. Assuming the power-law electron distribution,
we find a scaling law in the probability distribution function P_1(s), where
the peak height and peak position depend only on the power index parameter. We
solved the rate equation analytically. It is found that the spectral intensity
function also has the scaling law, where the peak height and peak position
depend only on the power index parameter. The present study will be
particularly important to the analysis of the X-ray and gamma-ray emission
models from various astrophysical objects such as radio galaxies and supernova
remnants.Comment: 12 pages, 6 figures, accepted by Physical Review D for publicatio
Ion-Ion Correlation Effect on the Neutrino-Nucleus Scattering in Supernova Cores
We calculate the ion-ion correlation effect on the neutrino-nucleus
scattering in supernova cores, which is an important opacity source for the
neutrinos and plays a vital role in the supernova explosion. In order to
calculate the ion-ion correlation effect we use the results of the improved
hypernetted-chain method calculations of the classical one-component plasma. As
in the preceding studies on this effect, we find a dramatic decrease of the
effective neutrino-nucleus scattering cross section for relatively low energy
neutrinos with E < 20MeV. As a matter of fact, our calculation shows a much
more dramatic reduction of the effective neutrino-nucleus scattering cross
section for the low energy neutrinos with E < 10MeV than the results of
Horowitz. Therefore, the ion-ion correlation effect will be more important than
has hitherto been recognized. We present an accurate analytic fitting formula
that summarizes our numerical results. This fitting formula will facilitate the
application of the present results to the supernova explosion simulations.Comment: 10 pages, 2 figures, 1 subroutine, published in ApJ 611, 1041-1044
(2004
- …