Observations of post-shock neutral hydrogen in four evolved supernova remnants

Details Observations of post-shock neutral hydrogen in four evolved supernova remnants Observations of post-shock neutral hydrogen in four evolved supernova remnants

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26as...63..345b&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 63, no. 2, Feb. 1986, p. 345-401. Research supported by the

Astronomy and Astrophysics

Astrophysics

37

Hydrogen Clouds, Neutral Gases, Shock Waves, Stellar Evolution, Stellar Spectrophotometry, Supernova Remnants, Centimeter Waves, Data Acquisition, Data Reduction, Interstellar Matter, Line Spectra, Molecular Clouds

Scientific paper

Observations in the λ21 cm line of neutral hydrogen of four evolved supernova remnants: IC 443, VRO 42.05.01, CTB 109 and G 78.2+2.1 are presented and briefly discussed. Many H I features display a remarkably high degree of morphological correspondence with radio continuum and optical filaments, proving that the neutral clouds observed are intimately connected to the remnants. The authors find evidence for accelerated, recombined gas associated with each object. In some cases a large fraction of the gas has received only modest acceleration implying high pre-shock densities. The morphologies of neutral filaments and clouds are classified and discussed in terms of an imbedded magnetic field model. Systematic structural changes with velocity are observed for some features which seem to imply a radially decreasing density profile within the preshock clouds.

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