Abstract
Observations of neutral gas in the vicinity of 24 SNRs (Supernova remnants) were performed on a RATAN-600 radio telescope with resolution of 2′×130′×6.3 km s−1. The observations demonstrate that kinematics and spatial structure of the gas in the vicinity of 12 SNRs is typical of the expanding evelopes. This paper considers in detail only those enveloping the SNRs. The dimensions and expanding velocities of the envelopes are defined and the evolutionary parameters of the SNRs estimated.
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