Copernicus: soft X-ray emission from certain features of the Cygnus Loop.
Abstract
Observations made with the MSSL 0.5-1.5 keV X-ray telescope on board Copernicus of several features of previous X-ray maps of the Cygnus Loop, including the prominent filaments (NGC 6992-5) in the northeastern part and a region in the northern part containing some scattered filaments and a small peak in the radio emission, are discussed. A thermal continuous spectrum is used to fit the satellite data to the X-ray maps, and emission fluxes and spectra are calculated for the filamentary regions. The results tend to confirm the existence of the previously mapped bright X-ray emitting regions, and support Stevens' interpretation that an encounter between the initial blast wave from the supernova and an inhomogeneous interstellar medium has caused the discrepancy between the observed optical filament velocities and the implied shock velocities necessary for the observed X-ray emission.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- February 1975
- DOI:
- 10.1086/181734
- Bibcode:
- 1975ApJ...196L..19C
- Keywords:
-
- Astronomical Maps;
- Cygnus Constellation;
- Oao 3;
- Satellite Observation;
- X Ray Sources;
- Interstellar Radiation;
- Radio Emission;
- Radio Spectra;
- Satellite-Borne Instruments;
- Spaceborne Astronomy;
- Spaceborne Telescopes;
- Supernovae;
- Thermal Radiation;
- X Ray Telescopes;
- Astrophysics