New selection effect in statistical investigations of supernova remnants

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Statistical Analysis, Supernova Remnants, Data Sampling, H Ii Regions, Interstellar Space, Stellar Envelopes, Stellar Structure

Scientific paper

The influence of H II regions on the parameters of supernova remnants (SNR) is investigated. It has been shown that the projection of such regions on the SNRs leads to: a) local changes of morphological structure of young shell-type SNRs and b) considerable distortions of integral parameters of evolved shell-type SNRs (with D > 10 pc) and plerions, up to their complete undetectability on the background of classical and gigantic H II regions. A new selection effect, in fact, arises from these factors connected with additional limitations made by the real structure of the interstellar medium on the statistical investigations of SNRs. The influence of this effect on the statistical completeness of objects has been estimated.

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