Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2012-02-21
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
6 pages, 4 figures, submitted to ApJ
Scientific paper
The interstellar medium is not necessary fully ionized. When a shock propagates into the partially ionized medium, some neutral particles leak into the upstream region from the downstream region. In this paper, we investigate how leakage neutral particles affect the upstream structure of the shock and particle accelerations. By using four fluid approximations (upstream ions, upstream neutral particles, leakage neutral particles and pickup ions), we provide analytical solutions of the precursor structure due to leakage neutral particles. It is shown that the upstream flow is decelerated in the precursor and the shock compression ratio becomes smaller than that of the strong shock limit, but the total compression ratio is the same as that of the strong shock limit. Even if leakage of neutral particles is small (a few percents of upstream particles), this smaller compression ratio of the shock can explain steep gamma-ray spectra from young supernova remnants.
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