Secondary Accceleration of Cosmic Rays by Supernova Shocks

Details Secondary Accceleration of Cosmic Rays by Supernova Shocks Secondary Accceleration of Cosmic Rays by Supernova Shocks

1997-09-14

arxiv.org/abs/astro-ph/9709133v1

Astronomy and Astrophysics

Astrophysics

4 page latex file. Complete uuencoded compressed PS file is also available at ftp://saba.fiz.huji.ac.il/pub/wandel/cr_icrc.uu

Scientific paper

In the common model supernova shock-acceleration of cosmic rays there are two open questions: 1. where does the high energy cosmic rays below the knee (10$^4-10^6$ Gev) come from, and 2. are cosmic ray accelerated only at their origin or contineuosly during their residence in the Galaxy. We show that $10^15$ eV light nuclei are probably accelerted by associations of supernovae. The ratio of the spectra of secondary to primary cosmic rays would be affected by repeated acceleration (also called reacceleration or secondary acceleration) in the ISM during their propagation in the galaxy. The observed secondary and primary CR spectra are used to constrain the amount of such reacceleration by supernova remnants (SNR). Two cases are considered: weak shocks ($13$) of relatively young remnants. It is shown that weak shocks produce more reacceleration than what is permitted in the framework of the standard leaky box (SLB) model, making it inconsistent with dispersed acceleration that should be produced by SNR. If the SLB is modified to allow a moderate amount of RA by week shocks, the RA produced by old SNRs agrees with the rate required to fit the secondary-to primaray cosmic-ray data, making a self consistent picture. Significant reacceleration by strong shocks of young SNRs should lead to flattening of the secondary-to primaray ratio at high energies, near 1TeV/nucleon.

Affiliated with

Also associated with

No associations

Rating

Secondary Accceleration of Cosmic Rays by Supernova Shocks 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 Secondary Accceleration of Cosmic Rays by Supernova Shocks, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Secondary Accceleration of Cosmic Rays by Supernova Shocks will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-150252