Supernova remnants as cosmic ray accelerators. SNR IC 443
We examine the hypothesis that some supernova remnants (SNRs) may be responsible for some unidentified y-ray sources detected by EGRET instrument aboard the Compton Gamma Ray Observatory. If this is the case, y-rays are produced via pion production and decay from direct inelastic collisions of a...
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| Date: | 1998 |
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| Main Authors: | , |
| Format: | Article |
| Language: | English |
| Published: |
Інститут фізики конденсованих систем НАН України
1998
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| Series: | Condensed Matter Physics |
| Online Access: | http://dspace.nbuv.gov.ua/handle/123456789/119813 |
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| Journal Title: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Cite this: | Supernova remnants as cosmic ray accelerators. SNR IC 443 / B. Hnatyk, O. Petruk // Condensed Matter Physics. — 1998. — Т. 1, № 3(15). — С. 655-667. — Бібліогр.: 24 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| Summary: | We examine the hypothesis that some supernova remnants (SNRs) may
be responsible for some unidentified y-ray sources detected by EGRET
instrument aboard the Compton Gamma Ray Observatory. If this is the
case, y-rays are produced via pion production and decay from direct inelastic
collisions of accelerated by SNR shock wave ultrarelativistic protons
with target protons of the interstellar medium. We develop a 3-D hydrodynamical
model of SNR IC 443 as a possible cosmic y-ray source
2EG J0618+2234. The derived parameters of IC 443: the explosion energy
E₀ = 2.7 * 10⁵⁰ erg, the initial hydrogen number density n(0) = 0.21
cm ⁻³ , the mean radius R = 9.6 pc and the age t = 4500 yr result in too
low y-ray flux, mainly because of the low explosion energy. Therefore, we
investigate in detail the hydrodynamics of IC 443 interaction with a nearby
massive molecular cloud and show that the reverse shock wave considerably
increases the cosmic ray density in the interaction region. Meantime,
the Rayleigh-Taylor instability of contact discontinuity between the SNR and
the cloud provides an effective mixing of the containing cosmic ray plasma
and the cloud material. We show that the resulting y-ray flux is consistent
with the observational data. |
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