The Observations of the Supernova Remnant G65.2+5.7 in the Emission Lines of OIII NII and SII

Astronomy and Astrophysics – Astronomy

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Scientific paper

Isophote charts in the [O III], [N II], and [S II] lines of the bright filament S 91 lying to the SE of the supernova remnant G 65.2+5.7 are constructed. The stratification of the emission regions in these lines is discovered. [O III] regions lie closer to the external ridge of the supernova remnant than the regions which emit the [N II] and [S II] lines. This displacement is explained as the observed cut of the radiative loss wave behind the shock front. The visible structure of [N II] and [S II] filaments is perhaps connected with radiative loss instabilities. The small (as compared to the [N II] lines) width of the [O III] filaments is explained by a greater value of the radiative losses in the [O III] lines.

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