Other
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...362..566h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 362, Oct. 20, 1990, p. 566-571.
Other
11
Astronomical Spectroscopy, Cygnus Constellation, Supernova Remnants, X Ray Sources, Galactic Structure, High Temperature Plasmas, Temperature Profiles
Scientific paper
The Cygnus Loop was observed with the large-area counter on board Ginga in the energy range above 1.5 keV. The observation was performed in a scanning mode along two different directions: one parallel, and the other perpendicular, to the Galactic plane. The spatial structure shows that the emission region above 1.5 keV is narrower than that below 1 keV while their centers coincide well with each other. Furthermore, it shows a center-filled structure (plerion-type) rather than a shell structure. The emission above 1.5 keV is not well correlated with the optical nebula. A high-temperature, low-density plasma fills the interior of the Cygnus Loop and is surrounded by a low-temperature, high-density plasma shell. The luminosity above 1.5 keV from the plasma filled inside the Loop is 2 x 10 to the 33rd ergs/s which is about 40 times stronger than that predicted with the strong shock model.
Hatsukade Isamu
Tsunemi Hiroshi
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