The structure and dynamics of evolved supernova remnants Shock-heated dust in the Cygnus Loop

Details The structure and dynamics of evolved supernova remnants Shock-heated dust in the Cygnus Loop The structure and dynamics of evolved supernova remnants Shock-heated dust in the Cygnus Loop

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...164..208b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 164, no. 1, Aug. 1986, p. 208-217. Research supported by Stichting Astronomisc

Astronomy and Astrophysics

Astronomy

55

Cosmic Dust, Shock Heating, Supernova Remnants, Brightness Distribution, Distance, Emission Spectra, Infrared Astronomy Satellite

Scientific paper

Observations of shock-heated dust in the Cygnus Loop made with IRAS at 12, 25, 60, and 100 microns are presented and analyzed. A bright shell is observed, coincident with the optical nebulosity and X-ray emission. Beam reconstruction and background removal techniques are employed to map the preshock density distribution within the shell. Emission characteristics are well described by current models of shock-heated dust if account is taken of the effects of an incomplete cooling layer and the presence of recombined gas. A revised distance estimate (D = 460 + or - 160 pc) is obtained, and the environment of the SNR is discussed. The evidence presented here as well as other recent observations very strongly suggest the existence of a high-density shell which predates the SNR. Optical observations of radially structured ionization zones and the apparent energy-diameter relationship for SNR suggest that this is a general phenomenon.

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