Supernova remnants as cosmic ray accelerators. SNR IC 443

• Дата: 1998
• Автори: Hnatyk, B., Petruk, O.
• Формат: Стаття
• Мова: English
• Опубліковано: Інститут фізики конденсованих систем НАН України 1998
• Назва видання: Condensed Matter Physics
• Онлайн доступ: http://dspace.nbuv.gov.ua/handle/123456789/119813
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: 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.

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.