A comparison of high-resolution radio and optical data for the northeast region of the Cygnus Loop

Details A comparison of high-resolution radio and optical data for the northeast region of the Cygnus Loop A comparison of high-resolution radio and optical data for the northeast region of the Cygnus Loop

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...306..266s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 306, July 1, 1986, p. 266-270. Research supported by the Johns Hopkins Univ

Astronomy and Astrophysics

Astronomy

15

Astronomical Spectroscopy, High Resolution, Radio Spectra, Supernova Remnants, Visible Spectrum, Astronomical Models, Centimeter Waves, H Alpha Line, Nebulae, Radio Sources (Astronomy)

Scientific paper

Radio observations of the northeastern part of the Cygnus Loop obtained with the VLA at 18 cm with a resolution of 4.7 arcsec are presented and discussed. In general, the brightest radio filaments match the brightest optical filaments very well, particularly those which are bright in H-alpha. The agreement in position, morphology, and relative brightness is particularly good where all four optical species are bright. However, a few bright radio features have no bright optical counterparts. The general radio and optical structure of the region can be explained by a model in which shocked interstellar clouds form filaments due to unstable cooling and compression. The features appear to be ropelike, although it is not possible to rule out that they are irregular sheets seen edge-on. A large gradation in cooling on a scale of parsecs is evidenced by the sequence of the optical species in emission, with a corresponding increase in density generally evidenced by the continuum radio emission.

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