Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....85...55d&link_type=abstract
Astronomy and Astrophysics, vol. 85, no 1-2, May 1980, p. 55-65.
Astronomy and Astrophysics
Astrophysics
40
Astrophysics, Radio Emission, Radio Sources (Astronomy), Supernova Remnants, Mapping, Synchrotron Radiation
Scientific paper
High resolution radio maps of CTB1 at 49- and 21-cm wavelengths and of the Cygnus Loop at 49-cm show fine filamentary structures which coincide perfectly with the optical features seen in these SNR. In CTB1, the radio shell is resolved; although the radio features occur within the same region as the optical ones, they fill a larger volume. By comparison of the radio, optical, and X-ray emission from the Cygnus Loop, a possible mechanism for providing the compression and maintenance of the magnetic field and relativistic particles necessary to produce the radio emission in the old SNR is investigated. Material which is heated and compressed by passage of the SNR shock through it will progressively cool behind the shock and the compression of this material to maintain a pressure balance will greatly increase the radio emissivity. Difference between the remnants are attributed to different ambient conditions in their surroundings which create variations in the amounts of heating and compression.
Dickel John R.
Willis George A.
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