X-ray structure of the Cygnus loop

Details X-ray structure of the Cygnus loop X-ray structure of the Cygnus loop

Dec 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974apj...194..329r&link_type=abstract

Astrophysical Journal, vol. 194, Dec. 1, 1974, pt. 1, p. 329-335.

Astronomy and Astrophysics

Astrophysics

89

Astronomical Maps, Cygnus Constellation, Nebulae, Supernovae, X Ray Spectra, Brightness Temperature, Energy Spectra, Interstellar Matter, Radiant Flux Density, Radiation Distribution

Scientific paper

An X-ray surface brightness map of the Cygnus Loop in the energy range 0.15-0.85 keV is presented. The X-ray distribution is compared with the optical and radio pictures of the Loop. The location of the center of the supernova shell as derived from the X-ray data is in excellent agreement with the apparent optical and radio centers. We obtain a mean diameter for the X-ray shell of 2.75 (+ or - 0.2) deg. The X-ray spectral data yield a characteristic thermal temperature averaged over the Loop of 2.9 million (+ or - 1.5 million) K. We have calculated anew X-ray parameters for adiabatic blast waves using X-ray production spectra which include line radiation. These parameters are compared with the results of the present experiment. An age of 18,000 years, initial blast energy equal to 3 times 10 to the 50-th power ergs, and ambient interstellar density of 0.25 per cu cm are found.

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