The interstellar oxygen edge in the X-ray spectrum of the Crab Nebula

Details The interstellar oxygen edge in the X-ray spectrum of the Crab Nebula The interstellar oxygen edge in the X-ray spectrum of the Crab Nebula

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...230l..83c&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 230, June 1, 1979, p. L83-L86. NASA-supported research.

Astronomy and Astrophysics

Astrophysics

14

Crab Nebula, Interstellar Gas, Oxygen, X Ray Spectra, Abundance, Heao 1, Heao 2, Supernova Remnants

Scientific paper

Measurement of the X-ray spectrum of the Crab Nebula by the HEAO 1 A-2 low-energy (0.15-3 keV) detectors is reported. The spectral restoration techniques described by Blissett and Cruise (1979) and Kahn and Blissett (1979) are used to demonstrate explicitly the existence of a 'negative' feature near 0.5 keV that is consistent with the edge expected due to absorption by interstellar oxygen. For a simple power-law model with photon index -2.08, the data require a column density of 3.0 + or - 0.1 x 10 to the 21st per sq cm and an oxygen abundance of 1.0 + or - 0.1 times the Brown and Gould (1970) value. Satisfactory fits can also be achieved with the more sophisticated Fireman (1974) models, but no model can be adjusted to fit the data without the inclusion of interstellar oxygen.

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