X-ray line emission from the Puppis A supernova remnant - Oxygen lines

Details X-ray line emission from the Puppis A supernova remnant - Oxygen lines X-ray line emission from the Puppis A supernova remnant - Oxygen lines

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...245..574w&link_type=abstract

Astrophysical Journal, Part 1, vol. 245, Apr. 15, 1981, p. 574-580. Research supported by the Alfred P. Sloan Foundation;

Astronomy and Astrophysics

Astrophysics

43

Cosmic Plasma, Oxygen Spectra, Spectrum Analysis, Supernova Remnants, X Ray Sources, X Ray Spectra, Electron Energy, Emission Spectra, Focal Plane Devices, Heao 2, Interstellar Gas, Line Spectra, Plasma Density, Plasma Diagnostics, Plasma Radiation

Scientific paper

Six prominent X-ray emission lines of O VII and O VIII have been detected from a portion of the Puppis A supernova remnant in observations with the Einstein Observatory Focal Plane Crystal Spectrometer. The lines are sufficiently well resolved to serve as diagnostics of the emitting plasma. From the relative intensities of the lines, it is inferred that the population of O VIII is about 1.5 times that of O VII, and that electron collisions are the dominant excitation mechanism in the plasma. A locus of allowed electron temperatures and interstellar-absorption column densities is derived: 1.5 x 10 to the 6th K, and (2-6) x 10 to the 21st per sq cm. The data are consistent with either a thin plasma source in equilibrium at a temperature of 2.2 x 10 to the 6th K with a column density of 4 x 10 to the 21st per sq cm, or with a nonequilibrium source in which the electrons have been shock-heated to a higher temperature and oxygen is underionized.

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