Sigma(D)-dependence of SNR in a cloudy interstellar medium and regular Z-effect

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Distance, Interstellar Matter, Supernova Remnants, Astrometry, Astronomical Coordinates, Height, Microwave Frequencies

Scientific paper

Critical analysis of the earlier obtained Σ(D)-dependences in the light of new observational data on the interaction of SNR expanding envelopes with inhomogeneities of interstellar medium is carried out. It is shown that more correct consideration of the factors which are the basis of Z-effect introduction testifies the dominating role of interstellar medium cloudiness, which completely suppresses the influence of the regular component of the medium. On the basis of most reliable calibrators, the last observations, theoretical notions of evolution, new Σ(D)-dependence for shell type SNR in a cloudy interstellar medium is obtained. On the basis of this dependence diameters D, distances from the Sun d and height over the galactic plane Z for ≡100 shell type SNR at two frequencies, 408 MHz and 1 GHz are calculated.

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